Cooling Fan Wiring
Thread Starter
Intermediate
Joined: Dec 2006
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From: Six Mile SC
Cooling Fan Wiring
Now that I have my gauge cluster and lighting working properly, I need to get this cooling fan working right.
The car is an 84 Coupe. I have just replaced the cooling fan relay. The boss says the temperature sensor had been replaced recently, but the fan isn't kicking on so I'm not sure if it is good or not.
Looking at the wiring diagram I have, the fan should kick on if I ground out the connector for the sensor, but it isn't working.
The fan does work if I ground the green/white wire coming off the solenoid.
My current plan is to run a new wire for the green/white straight to the temp sensor, so that when the correct temp is reach the wire grounds and the fan kicks on. Then if it still isn't working the temp sensor needs replaced too. Please let me know if I am thinking correctly for this car.
Oh, and AC is being removed so that part of the wiring is irrelevant anyway.
The car is an 84 Coupe. I have just replaced the cooling fan relay. The boss says the temperature sensor had been replaced recently, but the fan isn't kicking on so I'm not sure if it is good or not.
Looking at the wiring diagram I have, the fan should kick on if I ground out the connector for the sensor, but it isn't working.
The fan does work if I ground the green/white wire coming off the solenoid.
My current plan is to run a new wire for the green/white straight to the temp sensor, so that when the correct temp is reach the wire grounds and the fan kicks on. Then if it still isn't working the temp sensor needs replaced too. Please let me know if I am thinking correctly for this car.
Oh, and AC is being removed so that part of the wiring is irrelevant anyway.
Le Mans Master
Joined: Aug 2010
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I may be wrong , but on my 87 the fan is wired thru the AC so that when the AC is on the fan comes on automatically, if I take out the ac, I would have to rewire that so its not seen as an 'open' . if your rewireing it direct this wont matter . Just run power to the switch 'aka sending unit', to the fan , to ground.
Team Owner
Joined: Jan 2003
Posts: 20,342
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From: Summerland B.C. Canada
I don't have any wiring schematics for 84, but on my 86, the ECM controls the main fan with input from ECM coolant temp sensor(front of intake) and AC pressure switch.
Booster fan on front of rad is controlled by a temp switch in cylinder head.
Ground(green/white wire) is used to activate either relay.
http://members.shaw.ca/corvette86/Co...%20Control.pdf
Booster fan on front of rad is controlled by a temp switch in cylinder head.
Ground(green/white wire) is used to activate either relay.
http://members.shaw.ca/corvette86/Co...%20Control.pdf
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Last edited by vetteoz; Oct 4, 2010 at 05:30 PM.
- 1986 Original Owner -
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From: North Yorkshire, England
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Looks like I have one now 
Thread Starter
Intermediate
Joined: Dec 2006
Posts: 27
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From: Six Mile SC
Thanks for the replies. That is the schematic I found on alldata. Fortunately on the 84 it isn't controlled by the ECM.
I replaced the "fan switch" (proper terminology according to auto zone lol), and had to run a new wire straight over to the solenoid. Fan now kicks on at 230 like it should (I assume), and back off around 216 or so.
I replaced the "fan switch" (proper terminology according to auto zone lol), and had to run a new wire straight over to the solenoid. Fan now kicks on at 230 like it should (I assume), and back off around 216 or so.
