It blows cold when it is running, but after prolonged use during highway driving on a hot day, no cold air blows. I checked when this happens and the compressor has cut off. After sitting for a while (and cooling down) the A/C will blow cold again. I had it checked but the repair shop could not recreate the problem and they confirmed the freon was fully charged and all of the mechanics of the A/C system are working properly. The repair shop said that it may be something in the electrical system but they weren't qualified to troubleshoot that. What could it be?
Look under the car when it stops and after the engine is turned off, do you see a lot of water dripping under the car on the passenger side? If so the AC evaporator core is freezing up and the pressure switch is defective. If scenario this is not the case then you may have either a sticking compressor magnetic clutch relay or the magnetic clutch closing coil is shorted when it is hot.
SOURCE: Air conditioning blows hot air
You have a leak & not plenty of refrigerant
Why would it try to get cold when moving at higher
rpm?
Low Refrigerant
Leaks
Air in System
Dirty Evaporator
HVAC System Doors not switching
Expansion Valve or Orfice issues
Compressor Failing
Condensor dirty & filled with leaves between it &
radiator
& More
SOURCE: Put new AC compressor on,
You did'nt mention if you got the system refilled with Refrigerant after the Compressor was replaced or not. If not, that could be the problem.
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