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Old 02-11-2005, 04:37 PM
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Electric Fan

On my 1990 Camaro there is an electric fan.It only comes on when the air conditioner is turned on.If i switch it from A.C. to the heater then it shuts off.If i turn the A.C. off then the fan shuts off. The last owner byp****ed this by running a toggle switch to turn it on by this switch.This becomes a pain.How would i wire this differently?Could i wire this into the ACC.?

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Old 02-11-2005, 04:42 PM
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Radiator cooling fan? Interior air circulating fan?
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Old 02-11-2005, 04:45 PM
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electric fan

Rad fan
Put a thermostatic switch in the engine water jacket. Run it's power supply through a relay. The relay in turn will power up the fan when the switch gets to a certain temp.

Heater fan
I took the AC out because it was robbing HP and my fan never run right. I use a second switch but my speed switch still works. It has 4 on speeds.
It seems to be related to the climate controller or the economy feature. I never did figure it out.

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Last edited by bracketeer; 02-11-2005 at 05:01 PM.
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Old 02-11-2005, 06:41 PM
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i have the same problem on my 92 camaro, does anyone know what temp the fan is supposed to kick on. terminal a was bad on the realy, it was burnt up....i replaced the relay and let my coolant get up to 235 before i kicked the fan on with the ac switch, also my o2 sensor is dead so its not going into closed loop (the scanner says its only putting out .01v and the oscilloscope reads the same) would the fan only come on in closed loop?
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Old 02-11-2005, 07:13 PM
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The 90 camaro should have a temp swiitch in the right (pass) head between #6 and 8. If you ground that wire, the fan will run. Easy enough to run a second wire from the temp switch to a toggle switch on the dash. That info is for a TBI unit, TPI runs the fans thru the computer, using the coolant sensor.

I teach HS auto, and one of the tests we do in class is too check the perfomance of the fan. We also have 4 91 camaros/firebirds One test we do a lot is to run the engine with the snap on scanner and watch data stream. The fans come on at 229 degrees and cycle off at 219. Of course, they come on immediatly with the AC.
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