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 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.

6 Answers

tenspeed
87,215

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

3 out of 3 people think this is helpful.
kbro
24,695

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.

2 out of 2 people think this is helpful.

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

1 out of 1 people think this is helpful.
Lisa Mabry
50

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.

5 out of 5 people think this is helpful.
Bill Straslicka
660

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.

25 out of 25 people think this is helpful.
newPTcruiser
10

This is exactly what my car is doing. Can I tell if the fan is spinning without removing any parts? Where do I look?

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

PT Cruiser

Looking for a Used PT Cruiser in your area?

CarGurus has 4,709 nationwide PT Cruiser listings starting at $1,400.

ZIP:

Search Chrysler PT Cruiser Questions

Chrysler PT Cruiser Experts

#1 Tom Demyan
Tom Demyan
Reputation 1,620
#2 Gypsy Rose
Gypsy Rose
Reputation 1,060
#3 docwade931
docwade931
Reputation 990
View All

Related Models For Sale

Used Chevrolet HHR"
142 Great Deals out of 3,870 listings starting at $599
Used Volkswagen Beetle"
231 Great Deals out of 8,841 listings starting at $995
Used Ford Focus"
1,018 Great Deals out of 58,056 listings starting at $1,495
Used Ford Mustang"
759 Great Deals out of 40,103 listings starting at $1,450
Used Chrysler 300"
555 Great Deals out of 21,887 listings starting at $1,500
Used MINI Cooper"
344 Great Deals out of 10,648 listings starting at $1,995
Used Honda Accord"
1,209 Great Deals out of 75,191 listings starting at $995
Used Chrysler Sebring"
63 Great Deals out of 4,422 listings starting at $1,199
Used Toyota Camry"
1,527 Great Deals out of 95,391 listings starting at $895
Used Honda Civic"
1,022 Great Deals out of 56,082 listings starting at $995
Used Chrysler Town & Country"
708 Great Deals out of 21,865 listings starting at $1,400
Used Ford Escape"
1,465 Great Deals out of 91,551 listings starting at $500
Used Nissan Altima"
1,424 Great Deals out of 83,103 listings starting at $1,395
Used Toyota Corolla"
1,324 Great Deals out of 65,722 listings starting at $699

Used Cars For Sale