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Re: Blower motor only on high
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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Thu, 28 Oct 2004 12:38:44 Share Post by Email
In Reply to: Blower motor only on high, Alex, Thu, 28 Oct 2004 12:18:06
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Since you have a manual control, there is no transistor to fail. What has failed is the thermal fuse in the resistor pack inside the fan.

Open the hood, and remove the horizontal plastic cover at the base of the windshield. Stand on the driver's side of the car, and look at the big black rounded plastic hump that is the blower motor. Stuck in the side you'll see an electrical cable that ends in an electrical connector. I think it's held in by some spring clips. Remove the clips and pull it out. That's the resistor pack.

It's very quick and easy to access. All of about 10 minutes.

Now, you have two choices. One choice is to replace the resistor pack. Not cheap, but quick.

Choice two is to fix the resistor pack. The resistors consist of wire coils. They're probably not broken. You'll see a little black plastic cylinder with two leads - looks like a fat diode. This is a thermal fuse. If things get too warm, it open. It's a one-shot - you can't reset it.
The solution is to replace it. You can mail order them for about $1 from some electrical supply houses. Of course, with order minimums and shipping, you'll end up with 25 of them and a $30 bill. The other solution is to wire it out. Simply bridge that fuse with a piece of wire. Now, while I can't officially (officially??) sanction wiring out a safety system, let's just say that my car has been running that way for about 3 years.

My suggestion - after fixing it, avoid running the fan at speed 1. The fan blows air over the resistor pack, cooling it. At speed 1, the resistor pack dissipates the most heat, yet has the least airflow. If speed 2 is too fast, don't obssess over it; choose speed 1.



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