2001 Cavalier 10 amp under hood fuse for the a/c keeps blowing. The a/c compressor, in-line diode and orfice tube have been replaced with new and system is up to proper charge. Both power and ground wiring to compressor appear to be good but. With the car sitting at idle the compressor appears to run with no problems, however when driving and as engine RPM increases, the under hood fuse continues to blow after a period of time. Any idea what could cause this?
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It is located in the AC compressor liquid line which is the smaller of the 2 AC lines under the hood, the liquid line connects to the inlet of the AC evaporator core
Sounds like expansion valve(orifice tube) was installed backwards, it is directional. When Freon is full, suction line(Low Side) should sweat all the way back to the compressor. Also a new dryer would not hurt.
Which fuse ? A/C compressor fuse 10 amp. located in the under hood fuse box ? If this is the fuse the A/C compressor clutch is drawing to many amps . too much current flow . Need new compressor clutch . Have it checked , unless you know how to do current draw test .
check the wiring for rubbing through under the hood for the a/c compressor, then check for a bad/corrosive connection of the plug at the compressor and then check the diode at the compressor. also try turning the compressor clutch by hand as if its seized can cause too much draw on the system.
a loose or damaged wire is causing a short circuit!
you ned to get it tested & rectified by a auto electrician ASAP!
as wiring gets very hot & can destroy your vehicle! {catch fire]
check to see if the ac is charged,if so look at the ac relay and the low presure switch they could be bad,the expansion valve is a rectangulr alluminum box loking item sticking out of the fire wall with two ac lines atached to it (ur low side switch usally is here or near by),,,if ther is not a block ther then this model has a liquid line with the orfice tube made into line ,/u have to replace the whole liquid line it cimes with orfice tube in it
Problem is in the a/c circuit. Any time the defrost is on the a/c compressor will cycle on & off as it is used to dehumidify the air directed to the windshield. That's why the fuse can blow even in defrost mode.
Unplug the power connector at the a/c compressor and see if the fuse still blows. If not, then with a dmm or vom test a/c clutch winding for short. If ok, then test clutch diode for short. The diode is usually mounted at the clutch winding, but I've seen Chevy's with a diode that plugs into fuse/relay block under the hood. I have replaced these so don't overlook it.
If fuse blows with compressor unplugged then first check circuit between compressor and a/c relay (power side) for a short. It's possible for the wire to rub a bare spot in the insulation along it's travel along the block, bracket or manifold to the compressor. If ok, then test from relay (winding side) back to switch.
Does the A/C compressor run or does it blow the A/C fuse in the under hood fuse box?? If it's blowing the fuse you might have a bad A/C diode located in the underhood fuse block.It looks like a black fuse with a diagram on top of it.Pull it out & replace it & see if the problem is gone.These L series are notorius for having compressor problems,locking up,clutch coils going open.hope this helps
There is a compressor relay "fuse" under the hood (in the fuse compartment). It is black and has a "diode" symbol on it. I replaced mine and all was well. Good luck.
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