Car Information:
Chrysler PT Cruiser
Year: 2004
Engine Size: 4 cylinder
Trans: Automatic

Issue / Question:
When stopped at a traffic light or in traffic, the engine will start running rough, AC stops blowing cool air and engine begins overheating. I also notice what seems to be some warm extra humid air coming out of the ac vents inside the car. Once I am rolling again at 45 plus mph everything returns to normal.

I have had the cooling fan replaced twice, first a little over 2 years ago and they also recharged the ac at that time. They said the humid air was probably refrigerant being forced out of the ac system through some kind of pressure relief valve. The car ran fine after this for a little over a year.

The second time was about 6 months ago which again worked for a few weeks and then the same problem started over again. When I took it back they found a problem with the wiring harness going to the fan and replaced the wiring harness, fan, thermostat and flushed the cooling system. This time they told me the ac system was fully charged and there was no need to recharge the ac system. The car has been fine for the last 5 months but now the problem is starting again. What could be causing this problem? In doing online searches I have seen where this seems to be a problem with PT Cruisers but I have not found any definitive answers as to what the cause and fix is. Any information and direction you can provide would be greatly appreciated.

Answer:
If the cooling fan is running, sounds to me like you may have a heater core leaking coolant slowly, and when it gets down so low the engine starts to overheat causing the A/C to switch off and that would also explain the humid air inside the vehicle.

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