The radiator fan on my 1993 Cavalier V6 is failing to come on – something that I’ve only just noticed in the current hot weather. I’ve already replaced the thermo-switch on the side of the radiator (and this operates the alternator cooling fan OK) so I guess the other potential causes are the fan itself, and the relay that I think supplies power to it.
Can anyone confirm that there is such a relay and that it is located in the fuse box on the nearside of the engine compartment?
And, if this is correct, which of the three relays in the engine compartment box is the one for the fan? The box doesn't have the usual diagram identifying its relays and fuses. There are currently three relays in this box, 2 identical ones with no markings on them, and one marked 12v 16amp with the number 899551. I suspect that this latter one is the one controlling the radiator fan but would appreciate it if someone can confirm this.
Incidentally, all three relays seem to be stuck firmly in their sockets - is there a trick to removing them or they supposed just to pull out?
Radiator cooling fan
Radiator cooling fan
1993 Cavalier V6 Auto in Smoke Grey Metallic
Re: Radiator cooling fan
According to EPC,
The black (5 pin) radiator cooling fan relay is part number 90 148 857
For C25XE with Air Conditioning.
Without Air Con, there are many variations.
But for your car it should be...
For chassis numbers
upto -P1999999 and
upto - P5999999
5 Pin Orange relay number 90 459 640.
----------------
Used with Towing Attachment.
5 Pin Black relay number 90 148 857
As you have not quoted an orange relay (or any other colour) it should be part number
90 148 857.
I hope that helps.
As for the relays.
If they have never been removed, then they are just stuck... or could be rusted in place.
Disconnect the car battery,
Then use a flat blade (screwdriver or blunt kitchen knife / spatula) and lever between the relay and it's socket.
Once the relay is out, check the condition of the wiring and connectors for moisture, damage or corrosion.
The black (5 pin) radiator cooling fan relay is part number 90 148 857
For C25XE with Air Conditioning.
Without Air Con, there are many variations.
But for your car it should be...
For chassis numbers
upto -P1999999 and
upto - P5999999
5 Pin Orange relay number 90 459 640.
----------------
Used with Towing Attachment.
5 Pin Black relay number 90 148 857
As you have not quoted an orange relay (or any other colour) it should be part number
90 148 857.
I hope that helps.
As for the relays.
If they have never been removed, then they are just stuck... or could be rusted in place.
Disconnect the car battery,
Then use a flat blade (screwdriver or blunt kitchen knife / spatula) and lever between the relay and it's socket.
Once the relay is out, check the condition of the wiring and connectors for moisture, damage or corrosion.
Re: Radiator cooling fan
Thanks for the quick reply.
I've now managed to read the part numbers on the three existing relays in the engine compartment box. They are: 90338656 (which I had thought was the radfan relay), 90459640 (which from your information looks to be the radfan relay) and 90450173.
All however are black, whereas, as you say, all current supplies of 90459640 are orange.
I've also checked the relays in the fuse box inside the car under the steering wheel, which has ID info in the lid - and there is no radfan relay located here.
So I guess the radfan relay must be in the engine compartment box and likely will be 90459640.
I've now managed to read the part numbers on the three existing relays in the engine compartment box. They are: 90338656 (which I had thought was the radfan relay), 90459640 (which from your information looks to be the radfan relay) and 90450173.
All however are black, whereas, as you say, all current supplies of 90459640 are orange.
I've also checked the relays in the fuse box inside the car under the steering wheel, which has ID info in the lid - and there is no radfan relay located here.
So I guess the radfan relay must be in the engine compartment box and likely will be 90459640.
1993 Cavalier V6 Auto in Smoke Grey Metallic
Re: Radiator cooling fan
The chances are that you do not have a fuse in position '4' on the top row in the main dashboard fuse panel.
Usually Air Conditioning and / or V6 cars.
If that is so, then any relevant fuses and relays will be in the engine bay fuse / relay box.
Usually Air Conditioning and / or V6 cars.
If that is so, then any relevant fuses and relays will be in the engine bay fuse / relay box.
Re: Radiator cooling fan
90 450 173 is very confusing.
It is not listed for C25XE at all.
It is listed as the Air Con Relay for a C20LET
equipped Cavalier, from 1992 onward.
So for a 2 litre turbo model.
Or for water cooling fan for all Astra-F (1992-1998).
90 338 656
On the C25XE it is used for tha Auxilliary water pump for the Cavalier
(With or without air con)
If you had a Calibra C25XE, then this is used for water cooling fan and "fan and drive"
90 459 640
And you know that the orange relay is for water cooling fan upto 1993 for cars without air-con.
I apologise, because that just makes everything really confusing.
It is not listed for C25XE at all.
It is listed as the Air Con Relay for a C20LET
equipped Cavalier, from 1992 onward.
So for a 2 litre turbo model.
Or for water cooling fan for all Astra-F (1992-1998).
90 338 656
On the C25XE it is used for tha Auxilliary water pump for the Cavalier
(With or without air con)
If you had a Calibra C25XE, then this is used for water cooling fan and "fan and drive"
90 459 640
And you know that the orange relay is for water cooling fan upto 1993 for cars without air-con.
I apologise, because that just makes everything really confusing.
Re: Radiator cooling fan
Robsey - many thanks for the replies and information. Referring to your previous posting, I do indeed have a 30amp fuse in position 4 in the top fuse row of the dashboard fusebox in my 1993 non-aircon Cav V6. This fuse looks to be in good condition. There is no fuse in position 24 in the equivalent bottom row. Both these fuse positions have fan logos, but position 4 is just a fan, while position 24 is a fan in what looks to be a radiator. So you'd think that the position 24 fuse would be required to run the radfan - but my fan has until recently run perfectly well without it!
I'm going to replace both relays 90459640 and 90338656 when I can get hold of them. 90338656 is available new from GPS-Autovaux, but I can't find a new supply of 90459640 at all, so I've ordered a used one for an eBay supplier.
As for 90450173, again there is apparently no new availability if this, but used ones are available from eBay sellers, so I might replace this as well.
I'm going to replace both relays 90459640 and 90338656 when I can get hold of them. 90338656 is available new from GPS-Autovaux, but I can't find a new supply of 90459640 at all, so I've ordered a used one for an eBay supplier.
As for 90450173, again there is apparently no new availability if this, but used ones are available from eBay sellers, so I might replace this as well.
1993 Cavalier V6 Auto in Smoke Grey Metallic
Re: Radiator cooling fan
Well, I've now replaced relay 90338656 with a new one, and relay 90459640 with a used one (said to be tested as working and this time orange) and checked the radfan with a direct feed from the battery. It worked fine with the direct feed, but still does not come on when plugged into its normal connector, even with 100C to 105C showing on the dashboard gauge. I've still waiting to receive the third relay in the engine compartment box - 90450173 - so I can replace that. This is again a used one. Although the rad thermo switch is quite new (been on a year or so) I'm next going to try bridging the terminals in its connector to see if that turns on the radfan. The thermo switch is green, but ones I am seeing advertised as suitable for the Cav V6 (and Calibra V6) are grey. Does anyone know the colour code for these thermoswitch temperature switching points?
One other point is passing .....when testing the radfan with a direct battery feed, I thought it would be easier if I removed it complete with its shroud. The Haynes manual says it just needs to 2 bolts at the top removed and then 2 tabs at the bottom pull out of their slots as the shroud is lifted away. Not so with my V6 with auto transmission! The nearside base of the shroud is baulked by one of the transmission cooling pipe feeds to the bottom of the radiator. You cannot lift the shroud away without releasing this cooling pipe at its banjo connection to the radiator - which I really didn't want to do. So I left the fan and shroud in place and tested it in situ, and am glad that the fan is working OK and doesn't need replacing!
One other point is passing .....when testing the radfan with a direct battery feed, I thought it would be easier if I removed it complete with its shroud. The Haynes manual says it just needs to 2 bolts at the top removed and then 2 tabs at the bottom pull out of their slots as the shroud is lifted away. Not so with my V6 with auto transmission! The nearside base of the shroud is baulked by one of the transmission cooling pipe feeds to the bottom of the radiator. You cannot lift the shroud away without releasing this cooling pipe at its banjo connection to the radiator - which I really didn't want to do. So I left the fan and shroud in place and tested it in situ, and am glad that the fan is working OK and doesn't need replacing!
1993 Cavalier V6 Auto in Smoke Grey Metallic
Re: Radiator cooling fan
I have been looking through the various changes to the engine bay fuse box.
There is for :-
1 - with air con, without air con,
2 - Japan spec and hot climate spec, neither of these,
3 - two stage fan or with two auxiliary fans.
(UPDATED THREAD FOR NON AIR CON)
So thinking you have two-stage fan and not air-con...
You should have -
Fuse 34 in position 9b (rad fan run on)
Fuse 42 in position 9a (rad fan)
Fuse 48 in position 10a (traction control)
Relay K22 in position 5 (coolant pump run on)
Relay K27 in position 6 (rad fan)
Relay K34 in position 4 (rad fan run on)
Relay K52 in position 1 (rad fan)
Relay K67 in position 2 (rad fan).
I will update image in a moment.
Picture hosting site is freezing up.
There is for :-
1 - with air con, without air con,
2 - Japan spec and hot climate spec, neither of these,
3 - two stage fan or with two auxiliary fans.
(UPDATED THREAD FOR NON AIR CON)
So thinking you have two-stage fan and not air-con...
You should have -
Fuse 34 in position 9b (rad fan run on)
Fuse 42 in position 9a (rad fan)
Fuse 48 in position 10a (traction control)
Relay K22 in position 5 (coolant pump run on)
Relay K27 in position 6 (rad fan)
Relay K34 in position 4 (rad fan run on)
Relay K52 in position 1 (rad fan)
Relay K67 in position 2 (rad fan).
I will update image in a moment.
Picture hosting site is freezing up.
Re: Radiator cooling fan
Thanks for this information. In fact I don't have aircon (wish I did in this hot weather!) but I think I do have the 2-stage fan. So I guess I should have fuse 41 in position 13b, and relays K51, K67 and K87 in positions 5, 6 and 2 respectively. Is that correct?
Are the 3 relays located behind the fusebox under the steering wheel?
Are the 3 relays located behind the fusebox under the steering wheel?
1993 Cavalier V6 Auto in Smoke Grey Metallic
Re: Radiator cooling fan
They are in the engine bay fuse box, along with the three fuses.
Sadly postimage is having a hiccup, and so I cannot upload a fusebox layout image.
Sadly postimage is having a hiccup, and so I cannot upload a fusebox layout image.
Re: Radiator cooling fan
Thanks - I suspected that the engine bay fusebox contained the radfan relays. The third relay 90450173 arrived today. I’ve already replaced the other 2 relays in the engine bay fusebox (90338656 and 90459640) without fixing the problem, so I’ll replace 90450173 tomorrow and see if that fixes the problem. I have 3 fuses in the engine bay fusebox (40, 30 and 20amp) even though I don’t have aircon. I’ve checked them and they appear to be OK.
1993 Cavalier V6 Auto in Smoke Grey Metallic
Re: Radiator cooling fan
Due to ongoing PostImage issues,
I have emailed the information to you.
I hope that the images resemble what you have and make sense.
For info,
It lists 3 fuses and 5 relays.
Top Row = left to right.
K52 - green plug in position 1.
For Radiator Fan.
Relay K67 - blue plug in position 2.
For radiator fan.
Two fuse slots for air con (empty).
(There is no Relay slot 3).
Relay K34 - Green plug in position 4.
For radiator fan run-on.
Second Row - left to right.
Relay K22 - white plug in position 5.
For Coolant pump run-on.
Relay K27 - yellow plug in position 6.
For Radiator Fan.
Third Row.
Upper left.
Fuse 34 -black plug in position 9b.
For Rad fan Run-On. Not for Turbo.
Lower left.
Fuse 42 - black plug in position 9a.
For Radiator fan.
Vertically mounted fuse to the right of the other two.
Fuse 48 - yellow plug in position 10a.
For Traction Control.
Note that these are connector colours, not relay colours.
I have emailed the information to you.
I hope that the images resemble what you have and make sense.
For info,
It lists 3 fuses and 5 relays.
Top Row = left to right.
K52 - green plug in position 1.
For Radiator Fan.
Relay K67 - blue plug in position 2.
For radiator fan.
Two fuse slots for air con (empty).
(There is no Relay slot 3).
Relay K34 - Green plug in position 4.
For radiator fan run-on.
Second Row - left to right.
Relay K22 - white plug in position 5.
For Coolant pump run-on.
Relay K27 - yellow plug in position 6.
For Radiator Fan.
Third Row.
Upper left.
Fuse 34 -black plug in position 9b.
For Rad fan Run-On. Not for Turbo.
Lower left.
Fuse 42 - black plug in position 9a.
For Radiator fan.
Vertically mounted fuse to the right of the other two.
Fuse 48 - yellow plug in position 10a.
For Traction Control.
Note that these are connector colours, not relay colours.
Re: Radiator cooling fan
Many thanks for this information which is most useful. For the information of others on this forum I thought it would be useful to report what I have in the engine bay fusebox in my 1993 Cav V6 Auto:
Position 1 (green socket) - empty
Position 2 (blue socket) - relay 90450173
Position 6 (yellow socket) - relay 90459640
Position 5 (white socket) - relay 90338656
Position 9b (black socket) - green 30amp fuse
Position 9a (black socket) - red 40amp fuse
Position 10a (yellow socket) - yellow 20amp fuse
Positions 4, 13a and 13b - nothing, no sockets, relays or fuses
I have replaced relays 90459640 and 90338656 without getting the radfan to run. I’ve still got to replace relay 90450173 – here’s hoping that does the trick.
I also note that this listing does not include the relay that operates the alternator cooling fan. This fan operates OK on my Cav, suggesting that the radiator thermoswitch is working OK (it should be – I replaced it just a year or so ago). I guess that relay must be in the dashboard fusebox.
Position 1 (green socket) - empty
Position 2 (blue socket) - relay 90450173
Position 6 (yellow socket) - relay 90459640
Position 5 (white socket) - relay 90338656
Position 9b (black socket) - green 30amp fuse
Position 9a (black socket) - red 40amp fuse
Position 10a (yellow socket) - yellow 20amp fuse
Positions 4, 13a and 13b - nothing, no sockets, relays or fuses
I have replaced relays 90459640 and 90338656 without getting the radfan to run. I’ve still got to replace relay 90450173 – here’s hoping that does the trick.
I also note that this listing does not include the relay that operates the alternator cooling fan. This fan operates OK on my Cav, suggesting that the radiator thermoswitch is working OK (it should be – I replaced it just a year or so ago). I guess that relay must be in the dashboard fusebox.
1993 Cavalier V6 Auto in Smoke Grey Metallic
Re: Radiator cooling fan
Taken from this stickied thread.
posting.php?mode=edit&f=15&p=169785
Main Fuse box.
Fuse 3 - 10 amps
Control unit for radiator fan C 25 XE, 17 DT engines as of MY '93
Fuse 8 - 15 amps
Relay, radiator fan K26, as of MY '93
Fuse 24 - 30 amps
Motor, radiator fan
Series resistor, radiator fan
Full listing for a 1993 Car.
1993 Model Year
Additional Fuses, Relays and Modules - And their locations.
Engine Bay and Relay Frame Fuses
F34 - Auxiliary fan - Engine compartment relay frame without - Pos 9b/13a
F34 - Auxiliary fan - Engine compartment relay frame with AC - Pos 10a
F34 - Auxiliary fan - Engine compartment relay frame for 17 DT engine - Pos 6a
F36 - Fuel preheating - Engine compartment relay frame - Pos 12a
F38 - Horn, anti-theft warning system - Relay frame behind fuse box - Pos 4/8/12
F41 - Glow period - Engine compartment relay frame - Pos 13
F42 - Radiator fan (2nd speed) - Engine compartment relay frame with AC - Pos 13b
F42 - Radiator fan (2nd speed) - Engine compartment relay frame without AC - Pos 9a
F42 - Radiator fan (2nd speed) - Engine compartment relay frame for 17 DT engine – Pos 6b
F47 - Air conditioning - Engine compartment relay frame - Pos 13a
F48 - Traction control - Engine compartment relay frame without AC - Pos 10a
F48 - Traction control - Engine compartment relay frame with AC - Pos 10b
Buzzer Relay
H19 - Warning buzzer headlamps switch-on control - Fuse box - Pos 1
Relays, Control Units and Modules
K5 - Front fog lamps - Fuse box - Pos 5
K6 - Air conditioning - Relay frame behind fuse box - Pos 6
K7 - AC fan, 4th speed - Relay frame behind fuse box - Pos 10
K8 - Windscreen wiper interval - Fuse box - Pos 3
K9 - Headlamp washer - Engine compartment relay frame - Pos 3
K10 - Turn signal unit - Fuse box - Pos 2
K22 - Coolant run-on pump - Engine compartment relay frame without AC - Pos 5
K22 - Coolant run-on pump - Engine compartment relay frame with AC - Pos 9
K25 - Glow period - Engine compartment relay frame - Pos 8
K26 - Radiator fan - Engine compartment relay frame - Pos 5
K27 - Radiator fan - Engine compartment relay frame - Pos 6
K30 - Rear screen wiper interval - Relay frame behind fuse box - Pos 1
K34 - Radiator fan, run-on - Engine compartment relay frame without AC - Pos 4
K34 - Radiator fan, run-on - Engine compartment relay frame with AC - Pos 5
K35 - Heated outside mirror - Front lower left, rear quarter panel - Pos 2
K51 - Radiator fan 2nd speed - Engine compartment relay frame for 17 DT engine - Pos 5, 10
K52 - Auxiliary fan - Engine compartment relay frame - Pos 1
K57 - Central fuel injection - Behind right foot-well panelling - Pos 1
K58 - Fuel pump - Behind right foot-well panelling - Pos 3
K59 - Daytime driving lamps - Relay frame behind fuse box - Pos 13
K60 - AC compressor - Engine compartment relay frame - Pos 4
K61 - Motronic - Relay frame behind right foot-well panelling - Pos 1
K63 - Fanfare - Fuse box - Pos 6
K64 - AC fan, 1st speed - Relay frame behind fuse box - Pos 7/11
K67 - Radiator fan, 1st speed Auxiliary fan, 17 DT - Engine compartment relay frame for 17 DT engine - Pos 2
K67 - Radiator fan, 1st speed Auxiliary fan, 17 DT - Engine compartment relay frame without AC - Pos 2
K67 - Radiator fan, 1st speed Auxiliary fan, 17 DT - Engine compartment relay frame with AC - Pos 6
K68 - Fuel injection system - Engine compartment relay frame - Pos 3
K69 - Simtec - Behind right foot-well panelling - Pos 1
K73 - High beam - Relay frame behind fuse box - Pos 4
K76 - Glow period - Behind right foot-well panelling - Pos 3
K77 - Sheathed glow plugs - Behind right foot-well panelling - Pos 1
K78 - Series resistor - Behind right foot-well panelling - Pos 2
K79 - Charge control - Behind right foot-well panelling - Pos 5
K80 - Fuel preheating - Engine compartment relay frame - Pos 11
K82 - Engine speed, cold start acceleration - Engine compartment relay frame - Pos 4
K83 - 4 wheel drive - Under instrument panel, left - Pos C1
K84 - EI Plus - Engine compartment bulkhead, centre - Pos E1
K85 - Automatic transmission - Behind glove compartment - Pos D1
K86 - Check Control - Above glove compartment - Pos E1
K87 - Auxiliary fan - Engine compartment relay frame - Pos 2
K88 - Catalytic converter temperature - Relay frame behind fuse box - Pos 13
K89 - Rear fog lamp - Fuse box - Pos 4
K90 - AC compressor (AT) - Relay frame behind fuse box - Pos 3/7
K95 - Heated outside mirror - Relay frame behind fuse box - Pos 2
K97 - Headlamp washer - Engine compartment relay frame - Pos 3
K102 - Parking lockout - Engine compartment relay frame - Pos 8
Sensor
P39 - Bulb control sensor, trailer hitch - Relay frame behind fuse box - Pos 5
U4.8 - ABS control unit - Engine compartment - Pos C1
posting.php?mode=edit&f=15&p=169785
Main Fuse box.
Fuse 3 - 10 amps
Control unit for radiator fan C 25 XE, 17 DT engines as of MY '93
Fuse 8 - 15 amps
Relay, radiator fan K26, as of MY '93
Fuse 24 - 30 amps
Motor, radiator fan
Series resistor, radiator fan
Full listing for a 1993 Car.
1993 Model Year
Additional Fuses, Relays and Modules - And their locations.
Engine Bay and Relay Frame Fuses
F34 - Auxiliary fan - Engine compartment relay frame without - Pos 9b/13a
F34 - Auxiliary fan - Engine compartment relay frame with AC - Pos 10a
F34 - Auxiliary fan - Engine compartment relay frame for 17 DT engine - Pos 6a
F36 - Fuel preheating - Engine compartment relay frame - Pos 12a
F38 - Horn, anti-theft warning system - Relay frame behind fuse box - Pos 4/8/12
F41 - Glow period - Engine compartment relay frame - Pos 13
F42 - Radiator fan (2nd speed) - Engine compartment relay frame with AC - Pos 13b
F42 - Radiator fan (2nd speed) - Engine compartment relay frame without AC - Pos 9a
F42 - Radiator fan (2nd speed) - Engine compartment relay frame for 17 DT engine – Pos 6b
F47 - Air conditioning - Engine compartment relay frame - Pos 13a
F48 - Traction control - Engine compartment relay frame without AC - Pos 10a
F48 - Traction control - Engine compartment relay frame with AC - Pos 10b
Buzzer Relay
H19 - Warning buzzer headlamps switch-on control - Fuse box - Pos 1
Relays, Control Units and Modules
K5 - Front fog lamps - Fuse box - Pos 5
K6 - Air conditioning - Relay frame behind fuse box - Pos 6
K7 - AC fan, 4th speed - Relay frame behind fuse box - Pos 10
K8 - Windscreen wiper interval - Fuse box - Pos 3
K9 - Headlamp washer - Engine compartment relay frame - Pos 3
K10 - Turn signal unit - Fuse box - Pos 2
K22 - Coolant run-on pump - Engine compartment relay frame without AC - Pos 5
K22 - Coolant run-on pump - Engine compartment relay frame with AC - Pos 9
K25 - Glow period - Engine compartment relay frame - Pos 8
K26 - Radiator fan - Engine compartment relay frame - Pos 5
K27 - Radiator fan - Engine compartment relay frame - Pos 6
K30 - Rear screen wiper interval - Relay frame behind fuse box - Pos 1
K34 - Radiator fan, run-on - Engine compartment relay frame without AC - Pos 4
K34 - Radiator fan, run-on - Engine compartment relay frame with AC - Pos 5
K35 - Heated outside mirror - Front lower left, rear quarter panel - Pos 2
K51 - Radiator fan 2nd speed - Engine compartment relay frame for 17 DT engine - Pos 5, 10
K52 - Auxiliary fan - Engine compartment relay frame - Pos 1
K57 - Central fuel injection - Behind right foot-well panelling - Pos 1
K58 - Fuel pump - Behind right foot-well panelling - Pos 3
K59 - Daytime driving lamps - Relay frame behind fuse box - Pos 13
K60 - AC compressor - Engine compartment relay frame - Pos 4
K61 - Motronic - Relay frame behind right foot-well panelling - Pos 1
K63 - Fanfare - Fuse box - Pos 6
K64 - AC fan, 1st speed - Relay frame behind fuse box - Pos 7/11
K67 - Radiator fan, 1st speed Auxiliary fan, 17 DT - Engine compartment relay frame for 17 DT engine - Pos 2
K67 - Radiator fan, 1st speed Auxiliary fan, 17 DT - Engine compartment relay frame without AC - Pos 2
K67 - Radiator fan, 1st speed Auxiliary fan, 17 DT - Engine compartment relay frame with AC - Pos 6
K68 - Fuel injection system - Engine compartment relay frame - Pos 3
K69 - Simtec - Behind right foot-well panelling - Pos 1
K73 - High beam - Relay frame behind fuse box - Pos 4
K76 - Glow period - Behind right foot-well panelling - Pos 3
K77 - Sheathed glow plugs - Behind right foot-well panelling - Pos 1
K78 - Series resistor - Behind right foot-well panelling - Pos 2
K79 - Charge control - Behind right foot-well panelling - Pos 5
K80 - Fuel preheating - Engine compartment relay frame - Pos 11
K82 - Engine speed, cold start acceleration - Engine compartment relay frame - Pos 4
K83 - 4 wheel drive - Under instrument panel, left - Pos C1
K84 - EI Plus - Engine compartment bulkhead, centre - Pos E1
K85 - Automatic transmission - Behind glove compartment - Pos D1
K86 - Check Control - Above glove compartment - Pos E1
K87 - Auxiliary fan - Engine compartment relay frame - Pos 2
K88 - Catalytic converter temperature - Relay frame behind fuse box - Pos 13
K89 - Rear fog lamp - Fuse box - Pos 4
K90 - AC compressor (AT) - Relay frame behind fuse box - Pos 3/7
K95 - Heated outside mirror - Relay frame behind fuse box - Pos 2
K97 - Headlamp washer - Engine compartment relay frame - Pos 3
K102 - Parking lockout - Engine compartment relay frame - Pos 8
Sensor
P39 - Bulb control sensor, trailer hitch - Relay frame behind fuse box - Pos 5
U4.8 - ABS control unit - Engine compartment - Pos C1
Re: Radiator cooling fan
Robsey, many thanks once more for this information. I've now replaced relay 90450173 in position 2 and....the radfan now works!
I had to get the engine coolant up to 105-106C on the dashboard gauge before it cut in and it then sounded like it was operating at Stage 2. The fan quickly brought the temperature down and it cut out with 95C showing on the gauge.
So there remains a slight puzzle over Stage 1 fan operation but I'm inclined to let that go for now. The engine will not now overheat if I get stuck in traffic in this hot weather spell.
I had to get the engine coolant up to 105-106C on the dashboard gauge before it cut in and it then sounded like it was operating at Stage 2. The fan quickly brought the temperature down and it cut out with 95C showing on the gauge.
So there remains a slight puzzle over Stage 1 fan operation but I'm inclined to let that go for now. The engine will not now overheat if I get stuck in traffic in this hot weather spell.
1993 Cavalier V6 Auto in Smoke Grey Metallic
Re: Radiator cooling fan
Check fuse 24 in the dash fuse box.
It is a 30 amp fuse,
so if the fuses all appear okay, then check for melted fuse sockets or damaged wires.
It is a 30 amp fuse,
so if the fuses all appear okay, then check for melted fuse sockets or damaged wires.
Re: Radiator cooling fan
Yes - I've checked this but there is no fuse in position 24 and in fact neither is there a socket for a fuse - as I discovered when I tried to insert a 30amp fuse!
1993 Cavalier V6 Auto in Smoke Grey Metallic
Re: Radiator cooling fan
Seeing as you have a V6,
I am sure we recently had a thread about a dodgey temperature switch on the coolant bridge.
I was told that this switch is no longer available new, but I am surprised if there is not an X25XE / X30XE Vectra-B / Omega-B equivalent, but perhaps with a different connector plug.
In that thread, the issue was with extended periods of the rad fan running on - after the ignition was turned off.
I am not saying that your switch is faulty, but just thinking of what would cause the stage 1 part not to run.
Finally got Postimages to work using a different method.
I am sure we recently had a thread about a dodgey temperature switch on the coolant bridge.
I was told that this switch is no longer available new, but I am surprised if there is not an X25XE / X30XE Vectra-B / Omega-B equivalent, but perhaps with a different connector plug.
In that thread, the issue was with extended periods of the rad fan running on - after the ignition was turned off.
I am not saying that your switch is faulty, but just thinking of what would cause the stage 1 part not to run.
Finally got Postimages to work using a different method.
Re: Radiator cooling fan
I've now checked the temps at which the radiator thermoswitch operates.
For stage 1 fan it turns the fan ON at 100C and OFF at 95C. For Stage 2, it's ON at 110 and OFF at 105.
So my observation that my fan comes ON at about 105 and goes OFF at 95 is probably in line with Stage 1.
Though the fan is so efficient at immediatley getting the coolant temp down, I can't see it ever reaching the Stage 2 ON temp of 110C.
For stage 1 fan it turns the fan ON at 100C and OFF at 95C. For Stage 2, it's ON at 110 and OFF at 105.
So my observation that my fan comes ON at about 105 and goes OFF at 95 is probably in line with Stage 1.
Though the fan is so efficient at immediatley getting the coolant temp down, I can't see it ever reaching the Stage 2 ON temp of 110C.
1993 Cavalier V6 Auto in Smoke Grey Metallic
Re: Radiator cooling fan
That is good to know.
Typical fan cut-in temperature on a 4-pot is about 96°C
Being a bigger engine crammed into the same size engine bay, it would not take long for V6 engine bay temperatures to build up.
Typical fan cut-in temperature on a 4-pot is about 96°C
Being a bigger engine crammed into the same size engine bay, it would not take long for V6 engine bay temperatures to build up.