 Heater fan operation, troubleshooting |
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| malcolm2 |
 Dec 14 2013, 08:34 PM
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Advanced Member  Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States 
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The only thing installed on my car that is associated with HEAT would be the exchangers. Nothing else. I need to get the heat working so I started with the Heater fan in the engine bay.
SO FAR: successfully bench tested the fan with 12v. Put a known good headlight relay in the fan relay socket Successfully checked continuity of the wire from the lever to the 14-pin connector (GRN/wht). Connector attatched, and unattached Successfully checked continuity from the relay (87) to the fan (green wire), car was not running. Strange thing I noticed. Checking continuity from the lever to Pin #9 was good. I then checked continuity between the lever and pin 13, 11, 7, 5, 3, 2 & 1. With the 14-pin connector connected they all showed continuity to ground. THIS CAN"T BE RIGHT, can it? The car runs fine, all the lights work. Seems like a ground short, but it is not affecting anything else. My goal here was to (as designed) get 12v to the green wire on the fan, but I can't. I have read several posts that gave me some direction. But I am lost. Thanks, Clark  |
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| Mike Bellis |
Dec 15 2013, 01:30 PM
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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Dave is correct about the relay pin numbering.
Many circuits will show continuity to ground when turned off. This is normal for a circuit that is grounded through a load. Troubleshooting 101: Break the circuit in half, does the fan work? Does the relay work? Does the lever work? Is the circuit path complete? Start at the basics first. |
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| malcolm2 |
Dec 15 2013, 01:41 PM
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#3
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Advanced Member Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States
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QUOTE(Mike Bellis @ Dec 15 2013, 01:30 PM)  Dave is correct about the relay pin numbering. Many circuits will show continuity to ground when turned off. This is normal for a circuit that is grounded through a load. Troubleshooting 101: Break the circuit in half, does the fan work? Does the relay work? Does the lever work? Is the circuit path complete? Start at the basics first. I just kept plugging away checking continuity and a clean path as far as I could, plug and unplug the connectors & relay, with the car running, and car not running. As some may remember, I have been cleaning this car up for quite a while. One of the things I prettied up was the fan lever. So today, I un-prettied it up to make sure I was getting ground. That probably helped. Not sure if ONE fix did it, but knowing how the wiring worked pointed me correctly and IT IS BLOWING! Thanks for the responses. |
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Posts in this topic
malcolm2 Heater fan operation Dec 14 2013, 08:34 PM
Dave_Darling Not sure about the "continuity with everythin... Dec 14 2013, 11:50 PM
malcolm2
But here is how the heater blower circuit works:
... Dec 15 2013, 09:45 AM etcmss I've done this a couple of times and briefly r... Dec 15 2013, 06:15 AM Dave_Darling Correct, the switch on the DEFROST lever grounds p... Dec 15 2013, 01:09 PM |
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