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A/C Electrical Fuse Problems

tomibriggs on Mon May 19, 2008 1:15 PM User is offline

Year: 1996
Make: Toyota
Model: Corolla
Engine Size: 1.8
Refrigerant Type: R-134a
Country of Origin: United States

I've been trying to figure out why the previous owner of my car decided to run a wire from a toggle switch directly to the compressor to control the cycle.



As I was checking for obvious clues, I found that my a/c fuse was blown. I replaced it but the new one blew up as soon as I turned on the a/c. Could it be a bad a/c amplifier? How do I test it?





I have basic knowledge of how to use a mutlimeter tester & test light. Does anyone know where I should start if I were to trace the source of the short? Although my a/c cools just fine, I would really like to be able to restore the a/c electrical to its original design. I hate the fact that my compressor cannot cycle on & off automatically as well as the idle-up function.

Here's a copy of my wiring diagram. Please feel free to put notes on it & email as attachement to [email protected]



THANKS IN ADVANCE!

mk378 on Tue May 20, 2008 10:19 AM User is offline

That diagram is not specific to your car. It doesn't even show an A/C amplifier. You'll probably want to find a better diagram, perhaps an alldata subscription.

Does the condenser fan run off of that same fuse? Could be a bad fan motor. If it's not that it's probably a wire shorted to ground somewhere. The usual check is to isolate parts of the system by unplugging them then test continuity to ground. Or put in a new fuse with some parts unplugged and see if the fuse holds.

tomibriggs on Wed May 21, 2008 6:45 PM User is offline

Aux fan works fine. I had it unplugged when the 1st fuse blew. I will try the next component. Will the a/c work with the amplifier unplugged?

THANKS!

Edited: Wed May 21, 2008 at 6:48 PM by tomibriggs

NickD on Thu May 22, 2008 7:09 AM User is offline

Quote
I've been trying to figure out why the previous owner of my car decided to run a wire from a toggle switch directly to the compressor to control the cycle.

When I purchased my motorhome wasn't aware that the owners brother-in-law was a know it all electrician that made a ton of changes that didn't make a bit of sense. Just quit asking what he was thinking if even thinking was part of his behavior and corrected everything. This required getting circuits from both Chevy and the motorhome people. He did use good quality automotive wire in his favor, had a whole box full of it when finished.

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