 Defrost fan won't turn off |
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| jmargush |
 Sep 8 2014, 07:21 PM
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#1
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Member  Group: Members Posts: 460 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176  |
Got home from the autox yesterday and noticed something running when I shut the car off. Thought it might be fuel pump but it wasn't. Instead it was the defrost fan behind the fuel tank.
I tried pulling all the fuses and it never shut off. Any suggestions on where or what to look for? |
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| Dave_Darling |
Sep 8 2014, 11:02 PM
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#2
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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The relay may be stuck somehow. Certainly unplugging the relay should stop the blower.
The relay gets un-switched power on terminal #30. If the relay sticks, connecting 30 to 87, it will send power to the fan no matter if the ignition is on or not. The switching should happen when the ignition is on and when the heater lever is up all the way. The former provides power to the coil in the relay, the latter provides the ground. Even if the wire to the heater lever shorts to ground, turning the key off should still stop the relay from connecting 30 and 87. So that means either the relay is faulty, or something is connected incorrectly. Swap the relay for one of the headlight relays. If the light doesn't work (or doesn't stop going up and down!) and the blower works correctly, you've found the problem. --DD |
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Posts in this topic
jmargush Defrost fan won't turn off Sep 8 2014, 07:21 PM
jmargush You mention the lever being up
Are you refering to... Sep 9 2014, 04:11 AM
BeatNavy
You mention the lever being up
Are you refering t... Sep 9 2014, 05:01 AM jmargush Does that lever also control the motor up front by... Sep 9 2014, 05:45 AM bdstone914 The heater lever does not control the defrost fan.... Sep 9 2014, 06:03 AM Dave_Darling Shoot, you did say "behind the gas tank... Sep 9 2014, 09:23 AM jmargush Thanks
I'll check that relay board Sep 9 2014, 12:10 PM rhodyguy did you try moving the fresh air control sliders? Sep 9 2014, 03:11 PM partwerks I'd pull the ask tray, and see what's goin... Sep 9 2014, 09:24 PM |
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