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Ac fuse keeps blowing

40 amp fuse under the hood. Replaced it last week blown out again and no A/C again this week. Any ideas what is blowing the fuse?

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  • 83 Answers

Look at the wires connected to the a/c compressor on your motor. You might have a wire that's shorting out, or rubbing against something.

Posted on May 17, 2014

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Posted on Jan 02, 2017

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SOURCE: fuse keeps blowing out.

I had the same problem with my 2000 Windstar. It ended up being a brake fluid leak around a sensor on the master cylinder. The sensor is a known issue and has been redesigned. The brake fluid dripped onto some elctrical connections causing fuses to blow. The sensor turns off the cruise control when the brakes are pressed. On some vehicles it was known to cause fires and Ford had to provide a recall. At the time my Windstar was not covered in the recall but it may be now.

Posted on Jul 23, 2008

mrgreenz
  • 962 Answers

SOURCE: 98 stratus won't start

Check the fuel shutoff valve. to see if it is on. press the reset button to do this. if it stays on. The answer could be pinched wires (a short) from the fuse wiring back towards the shutoff valve. if the valve shuts off try checking for current with a test light. if no current . The valve is bad. it seems like a short or open circuit on the fuel system wiring.

Posted on Dec 19, 2008

insanegtp
  • 112 Answers

SOURCE: 20 amp fuse in the box under hood that keeps blowing

Does it only do this when the heat or A/c is on full blast.. ( I had a few of my customers with this problem and they needed a new blower motor..)

Posted on Jan 26, 2009

emissionwiz
  • 76682 Answers

SOURCE: jump wont work. 80 amp fuse blown under hood. where does fuse go

that is the alternator and vehicle power supply fuse, did u jump this wrong? u will need to replace this fuse before the car will start.

Posted on Mar 20, 2009

  • 31 Answers

SOURCE: 50 amp fuse keeps blowing

There are several ways to solve this problem. You need a schematic of vehicle from Haynes or whoever, such high amperage I would place in line fuses to each item, that way it will isolate problem then look for bare or rubbing wire under seat or in doors ( too much junk jammed under seats) ? Anyway with a little time and some disassembly should be a simple fix.

Posted on Mar 22, 2009

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1 Answer

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may be what the mechanic did is the problem but I think that it would have blown immediately if it was
I would be looking for a wire heavy size wire like to the alternator, or after the fuse box etc that is touching ground or a relay that is faulty

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Hi, since the whole panel is dead, I would check the 40 amp HVAC BLOWER fuse under the hood. Please get back to me if either that isn't the problem or the fuse blows again.

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I have a 2004 Chevy Cavalier. A couple of months ago, just after starting the car one day, the 'check engine' and 'trac off' lights both came on. I immediately shut off the car, waited approximately 5...


Many cars have the cooling fan on a thermostat or time delay, to allow it to run for a short period of time after the engine turns off, to cool the engine off. You may have just never noticed it before. So I wouldn't worry about that.
Your real problem is the blowing fuses, apparently you have a short somewhere in your wiring. Putting in bigger and bigger fuses is a great way to set fire to your wiring harness. It's possible that the wire is pinched or chafed somewhere, and perhaps when you hit a bump just right, it touches and shorts.
You may have to take this to the Chevy dealer or a GOOD independent shop to have them chase it down. Unless someone out there knows exactly what this is, it could be a tough one to find.

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