I have a 2006 Chevy Cobalt that runs normally with the ac off however if you turn the ac on the belt will squeak and the car will promptly shut off. Does this seem like a belt issue or the ac pulley? Any other suggestions or comments would be appreciated.
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This may be a compresor issue,when the car is normal(a/c off) the compressor is not draging the engine,how ever when on if the compressor is goin bad(seizing) will turn your engine off and the belt will drag. have you compressor checked and also see if the system is over charged.
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Normally the low pressure and High pressure lines run on the passenger side of the engine area. They are the two aluminum lines that run to the firewall from the AC compressor. The good news is the refill can you are going to use to refill your system will only fit the low side line. The fitting is most likely covered by a plastic dust cap to keep it clear.
check belt tension, check power alternator field and armature windings according to specs (smaller wires going to alternator harness) check voltage drop on main alternator cable going to battery, less than 0.4 volts ok, check alternator ground (less than 0.1v ok) check if alternator is regulating voltage in alternator or by pcm computer, also check if vehicle has a load detector to increas rpm while under electrical load....
check your heater coil under the dash on passanger side for leak at joint areas. it could be condensation from the AC condencer dripping down the line that goes into the firewall, if so seal that area with a good sylicone.