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A/C Blower is haunted: switch, resistor, or loose wires?


 
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Bladeforger
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Joined: 27 Aug 2006

PostPosted: Sun Aug 27, 2006 7:22 am    Post subject: A/C Blower is haunted: switch, resistor, or loose wires? Reply with quote

Please help if you know the answer!! I posted this on another forum and received no replies...

My A/C is haunted! The blower doesn't always come on. The problem began last year when the fan would periodically decide to not run. Then it quit altogether. I pushed and pulled on some wires under the hood one day at Home Depot and it worked! Great, I thought.

Two months ago (in Summer, of course!!) the fan started coming on ONLY after I had the engine running for a minute or two.

A few weeks ago the fan began staying on when I turned off the ignition switch. So, then, I started turning off the A/C (middle button) every time I stopped. Then the process was: start the engine, turn on the A/C, wait a minute, be cool, stop, turn off ignition, turn off A/C. I could still live with that.

DAY BEFORE YESTERDAY, the fan didn't come on for 5 miles, and then it came on. Next stop, it didn't come back on at all. Grrrrrrr.

Did some reading on this forum and read yesterday that the switches and resistors are problem areas, and how to reach them. OK, fine. In about a week I'll have time to pull the switch and test it and/or replace it. It doesn't sound like the resistor because when the fan *IS* working it works at all speeds. But is it the switch?? Are these switches that erratic? Really?

I envisioned some little wire someplace that got so loose it moved from its proper position to an always hot position, explaining the erratic behavior and running with the switch off. What do I know, I'm not an automotive electrical genius--more like a dangerous kindergartener.

HAS ANYONE ELSE had the same trouble or had enough experience to know what I'm facing here? I'd hate to spend a large part of a Saturday or Sunday pulling out the dadgum switch only to find it is perfectly healthy. (But, then, maybe I'm off in the estimate of the time needed.)

All help is appreciated!
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88WOWJ
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Joined: 12 Aug 2006
Location: Hinesville Ga

PostPosted: Sun Aug 27, 2006 6:11 pm    Post subject: Haunted Fan Reply with quote

I have never heard of such a thing. Most likely the fan switch shorted
The fan runs continous even at the lowest setting the only way the fan is off is to slide the upper bar to the left. I would go for the switch.
If the fan blows on all speeds when it works the resistor is good.
The fan could be bad but you can run direct power to check that.
_________________
1988 Wagoneer Limited XJ Tellico Tested
Rocklizards panels, Tomken rear bumper and front Tow brackets, Rocket air intake, 2 inch lift,
30x950x15, 1991 coolant system with electric fans, 8,000 mile marker winch
1991 Cherokee Limited
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Bladeforger
Member


Joined: 27 Aug 2006

PostPosted: Mon Aug 28, 2006 9:04 am    Post subject: Re: Haunted Fan Reply with quote

88WOWJ wrote:
I have never heard of such a thing. Most likely the fan switch shorted
The fan runs continous even at the lowest setting the only way the fan is off is to slide the upper bar to the left. I would go for the switch.
If the fan blows on all speeds when it works the resistor is good.
The fan could be bad but you can run direct power to check that.

So... a shorted fan switch could make it run even if the ignition switch is off? That was the part that was blowing my mind.
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