 Heater defrost helper fan circuit, help |
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| steuspeed |
 Dec 11 2012, 12:36 PM
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#1
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Senior Member  Group: Members Posts: 1,010 Joined: 12-July 11 From: Portland, Oregon Member No.: 13,308 Region Association: Pacific Northwest  |
My blower fan stopped working. I know the fan is good since I can hook up 12V from the engine compartment and it runs. All my fuses look good. Twisted them all. I took apart the heater lever and cleaned up the contact and the blade connector that attaches there. It looked pretty corroded and wet, so I figured that was it. I didn't measure the voltage there since it was a PIA before I reassembled it. I'm getting 0.3 V on the Green/White wire in the engine compartment. Any suggestions?
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| luskesq |
Dec 11 2012, 12:48 PM
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#2
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Member Group: Members Posts: 276 Joined: 24-October 10 From: Fresno, CA Member No.: 12,303 Region Association: Central California |
Did you check the relay on the regulator board in the engine compartment? IIRCC it is the rearmost relay on the board, kinda in the center. Good luck.
Keith |
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| r_towle |
Dec 11 2012, 02:57 PM
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#3
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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The fan lever is a ground.
So you wont see voltage, but you can pull the plug off the fan and test that ground (ohms) to see if the lever is working. You get power from the same power source as the fuel pump....so if the car runs, the fan gets power. As far as the relay goes..I cant remember which one, but if both your headlights work, pull one of those round relays from the front trunk and keep swapping it into the relay board in the engine bay till something changes. There are also two or three fuses on the board, cant recall (god I am getting old) if one of them has anything to do with the fan. rich |
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| steuspeed |
Dec 11 2012, 04:40 PM
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#4
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Senior Member Group: Members Posts: 1,010 Joined: 12-July 11 From: Portland, Oregon Member No.: 13,308 Region Association: Pacific Northwest |
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| steuspeed |
Dec 12 2012, 01:02 PM
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#5
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Senior Member Group: Members Posts: 1,010 Joined: 12-July 11 From: Portland, Oregon Member No.: 13,308 Region Association: Pacific Northwest |
It was a bad relay. I switched out my fog light relay from under the dash until I get a replacement.
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