I have a 2007 Chrysler PT Cruiser. AC works when driving but not when idle. When idle and AC is on, the car rumbles about every 10 seconds but doesn't when AC is off.

Millsmick
0

Asked by Millsmick Apr 15, 2013 at 10:48 PM about the 2007 Chrysler PT Cruiser 4 Dr Base

Question type: Maintenance & Repair

I have a 2007 Chrysler PT Cruiser. AC works when driving but not when idle. When idle and AC is on, the car
rumbles about every 10 seconds but doesn't when AC is off.

5 Answers

tenspeed
55,405

It sounds like the engine speed is too low to run the compressor.

kbro
16,825

Compressor is weak. If you increase engine speed and it blows cold its a little low on charge or your ac comprssor is at fault.

tommcmanis
3,955

the rumble cycling is engine torsion mounts upper and lower and possibly engine mount front.

Lisa Mabry
20

If you didn't yet get your problem solved, it is the fan. My daughter had same problem, as did her friends mother with pt cruiser. The fan or the fan relay switch isn't working, so when the a/c tries to turn it on, it pulls power and idles very rough. New fan, problem fixed.

2 out of 2 people think this is helpful.
Bill Straslicka
110

Lisa hit the nail on the head. The problem here is that your radiator fan unit needs replaced as the OEM fans in these vehicles are known to be problematic. The issue is that the low speed on the fan has died but the high speed is still ok, which prevents the engine from overheating. Since the low should ALWAYS be engaged when the A/C is running, there's a simple check to see if your fan is the culprit. With your engine cool, turn the car on and turn on the A/C. If the fan is NOT spinning, it needs replaced. (It’s important to do this check on a cool engine, otherwise the fans high speed may kick on causing you to think that the fan is working properly). This check should also be performed fairly quickly as I don't recommend running the A/C without the fan for prolonged periods. The reason for this is because when the fan isn't spinning, there is not adequate air flowing over the cooling fins to remove the heat from the refrigerant. When this happens, the A/C system builds up excessive pressure and socks the compressor which makes it hard to start. The reason the engine idles rough is because it's being bogged down while trying to run the compressor in this state. You should also know that when excessive pressure builds up in the system, it will vent some R134 (the refrigerant) to relieve the built up pressure and prevent damage to the system. So obviously, if you continue to run the A/C in this state you'll eventually need to add refrigerant. If you’re wondering why the A/C works when the vehicle is in motion, it’s because the air entering the grill from the highway is passing over the cooling fins and thereby doing the work of the fan and cooling the refrigerant. Replacing the fan yourself should take somewhere around 90 to 120 minutes. The actual part costs around $100 and there's a decent YouTube video out there that shows how to do it. (http://www.youtube.com/watch?v=EwquTLC2Ink). This DIY repair is well worth it as I've heard some people say they were quoted around $800-900 for the repair at the dealership.

5 out of 5 people think this is helpful.

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