Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

Heat/AC help, keep blowing fuses :(

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Old 05-12-2002, 12:13 AM
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Heat/AC help, keep blowing fuses :(

Ok, here's the story. When I got the car, the heat and air wouldn't do anything. The only thing I had was the forced air from driving. I checked the fuse and got it to work after messing with the relay (? box that plugs into the wiring beside the fan motor.) When I turned it off and then on again though, it blew the fuse. I've since switched out the entire heat/ac control assembly, same thing. I've changed the relay as well, same thing. I keep blowing fuses and would love to have some air and defrost in the winter, so if anyone can offer any advice, I'd greatly appreciate it! Thanks!

-Maul
Old 05-12-2002, 09:10 PM
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Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
Welcome to the boards Maul

Have you taken the blower motor out to see how freely it moves? It might be binding (or just old & crappy) causing the fuse to blow.
Another possibility could be the resistor having gone bad (plugs to the black plastic HVAC housing, close to the motor). Or. just a short somewhere in the wiring.

Here's a diagram to help your hunt.
http://92b4crs.tripod.com/86wiring/dia-pics/63-0.jpg
(drag the link up to your browswers addy bar to view)
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