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Old 06-12-2002, 02:17 PM
Lech615 Lech615 is offline
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Join Date: Oct 2001
Location: Long Island, NY
Posts: 105
Mechanic help needed

I have an 86 F150 with a 302. I think there is a short somewhere in the lectrical system. My a/c & heat used to work fine, now it sometimes works and sometimes does not. When I switch the a/c on you can hear the veents open, but the blower motor doe snot come on. Where or how would I go about checking the system to find the problem? I am desperate here because it effects the way the truck drives sometimes, please help.


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Old 06-12-2002, 10:07 PM
Alan Alan is offline
Join Date: Mar 2000
Location: NW Vermont (Milton)
Posts: 1,185
We've got a similar problem with our 97 Chevy. Problem on that one seem to be inside the motor. If you slap it upside the head it comes to life. We've got a spare motor on the shelf for the day this one refuses to wake up. Seems like you could check for voltage at the motor connector pretty easy, that would tell if you've switch/wiring problems or a bad motor.
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Old 07-11-2002, 12:37 AM
Pelican Pelican is offline
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Join Date: Dec 2001
Location: LaGrangeville, N.Y.
Posts: 164
You'll have to start tracing circuits as Alan suggested, your problem could be in a number of places. Check for power at the switch, then out at the blower.

The switch contacts could be dirty as could the wire connectors. There's a rheostat inside the blower housing that controls blower speed, check your connections here. They are exposed to dirt and moisture under the hood and are the most likely to corrode. I've also seen the rheostat rust out from exposure to moisture. Good luck
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Old 07-24-2002, 03:09 PM
scott's turf scott's turf is offline
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Join Date: Oct 2001
Location: NH
Posts: 949
Unplug the blower unit and run it directly to the battery to see if it runs. If not take out the 4 bolts and go to the junk yard and pick one up. I did that for my f250 last year and it only cost me $10 and it has been working for over a year. It only took about 5 mins of total time to fix.
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Old 08-18-2002, 11:16 PM
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Brickman Brickman is offline
Join Date: Mar 2002
Location: eastern WY
Posts: 1,249
Some blowers are so easy to change it is silly. A ten year old could do it. Others require a stick of dynamite to change.
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