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Old 07-19-2010, 01:27 AM   #1
nate9
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heating issues, ? aux fan

Hi Everyone

I have some over heating issues. The temperature will some time goes up to around 3/4 and it flucuates at times. When I turn on the a/c the aux fan does not turn on, but the temp does not neccessary rise when a/c is on. Driving on the highway, temp seems to be normal. Over heating seems to be at stop still or at low speed. I check the fuses for the aux fan they are fine. What should I check next, switches? where are they located? and what should I check for

thank you for helping
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Old 07-19-2010, 03:21 AM   #2
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Wiring. My Aux fan harness was messed up so I re-wired to the ignition switch to turn on when the car was running. Once I got my temperature and hoses all sorted out, disconnected the ground so it wouldn't run but always within reach if it ever over-heats again
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Old 07-19-2010, 05:12 AM   #3
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Try jumping the temp switch mounted to the rad to see if that makes it come on, it,s supposed to come on at a preset temp.
I just replaced my fan clutch and that made a huge difference as well.
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Old 07-19-2010, 09:49 AM   #4
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The reason your fan doesn't come on for the most likely answer is your aux fan resistor is broken blown etc. This is a common problem with the steel framed or plastic fans and the resistors vary in price. As suggested above, try by-passing the resistor-direct power to see if you are in fact getting power to it to make it turn on.
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Old 07-19-2010, 12:28 PM   #5
nate9
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Sorry, it might be a stupid question....I am really a newbie with this. How do I by pass the resistor and direct power the fan? Please advice with detail if possible.
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Old 07-19-2010, 12:45 PM   #6
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by the way, does anyone knows the specification of the orginial aux fan resistor...such as the voltage, ohms and amps

Thank you very much guys
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Old 07-19-2010, 12:52 PM   #7
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Near the fuse box, is another little box with a straight fuse (there's 2 there). That is part of your ignition. One runs constant, the other when you start the car. Figure it out from there with some 12gauge wire and run new wire from the other little fuses to the fan direct. You could even cut the wires and run a battery charger to the ground and positive direct to the fan to see if the fan still works.
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Old 07-19-2010, 01:22 PM   #8
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Quote:
Originally Posted by HavocSteve View Post
You could even cut the wires and run a battery charger to the ground and positive direct to the fan to see if the fan still works.
WHY would you tell someone to cut their harness to test a fan?

Jebeezus Cripes.

Pull the fan harness apart, located near the drivers headlamp assembly and carefully apply power there to test the fan.

If you're car goes to 3/4 temp without the a/c on, then replace your fan clutch. You've already removed a/c as the culprit of adding too much heat. The clutch fan should keep the car at 1/2 at any time without the a/c on.
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Old 07-19-2010, 02:38 PM   #9
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WHY would you tell someone to cut their harness to test a fan?

Jebeezus Cripes.

Pull the fan harness apart, located near the drivers headlamp assembly and carefully apply power there to test the fan.

If you're car goes to 3/4 temp without the a/c on, then replace your fan clutch. You've already removed a/c as the culprit of adding too much heat. The clutch fan should keep the car at 1/2 at any time without the a/c on.
Well for myself. I made my own harness. So no worries for myself since I know a little bit about power supply ect. This was my problem, my temp ran 3/4 until I hooked up the aux fan. It kept it cool at around half temp. Until I figured out I needed a new rad and hoses, my temp would get high. I hooked up the battery charger and was lucky that mine actually worked. My wires were all fired so I had to re-wire everything. You could re-wire it yourself and make it a switch activated aux fan for when your stuck in heavy traffic so you can flick it on and know you won't overheat.
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Old 07-19-2010, 03:57 PM   #10
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Sounds like your clutch is failing too.

You *could* do everything you said.. You could also run a dry ice bucket to cool the car, or ditch everything and run a Spa fan. Or, mount the radiator on the roof.

But its probably best to fix things correctly. The fan clutch is cheap, easy and provides more than enough cooling. I punished my stock cooling system this weekend, 35*C+ heat doing stop and go, then hard long pulls (with a turbo) while tuning and my coolant temp never wavered. No A/C fan installed.

Coincidentally, I have an A/C fan for sale.
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Old 07-19-2010, 04:28 PM   #11
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Sounds like your clutch is failing too.

You *could* do everything you said.. You could also run a dry ice bucket to cool the car, or ditch everything and run a Spa fan. Or, mount the radiator on the roof.

But its probably best to fix things correctly. The fan clutch is cheap, easy and provides more than enough cooling. I punished my stock cooling system this weekend, 35*C+ heat doing stop and go, then hard long pulls (with a turbo) while tuning and my coolant temp never wavered. No A/C fan installed.

Coincidentally, I have an A/C fan for sale.
Clutch fan seems to be working good on mine now. Took about 5 minutes to take the old rad out and get everything going then the clutch fan.... Thing took almost 2 hrs to get off since it was original and was like welded on there >_<. So I swapped it and took the aux fan off. No problems, my temp does go up to half in bad heat + traffic, but doesn't go any higher.
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Old 07-20-2010, 05:49 AM   #12
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A simple test for the fan clutch, run car to temp., use rolled up paper and just gently and carefully touch it to the moving fan.
Please be carefull and only touch the moving fan, if it slows or stops the clutch is toast.
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Old 07-20-2010, 11:50 AM   #13
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Or use your fingers. If you still have fingers, your clutch needs replacing.

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