Cooling fan resistor pack test question

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Old 05-04-2023, 06:39 AM
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Originally Posted by audi_marv
Yes, this could be the problem if your fan is not turning on when the AC is turned on. A MM test would confirm this, but I simply swapped out the sensor.
You may also need to check/switch around the cooling fan relays in the fuse box.
The HVAC blower does not operate on fan only, or on AC, or on heat. The fan is good, the panel lights do what they should, but the blower never comes on.

Last edited by shoalsgary; 05-04-2023 at 02:02 PM.
Old 05-11-2023, 06:22 AM
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Sounds like your fan relay(s) are out, or the a/c controller on the dash console is bad.
Old 05-12-2023, 04:22 PM
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I found a small four blade relay on thr floor of my garage. That could possibly be it, but I have no idea where it goes.And it's looking more and more like I'm going to have to pay $165/hour for the shop to figure it out.
Old 05-15-2023, 12:35 PM
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Fuse box under the hood on the driver's side.
Old 05-15-2023, 01:36 PM
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There are two "643" relays there. Which one? I swapped them: no improvement.

Last edited by shoalsgary; 05-18-2023 at 10:35 AM.
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