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
84,585

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

3 out of 3 people think this is helpful.
kbro
24,075

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
610

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.

24 out of 24 people think this is helpful.
newPTcruiser
0

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

Your Answer

Add photo

Related Questions

PT Cruiser

Looking for a Used PT Cruiser in your area?

CarGurus has 4,646 nationwide PT Cruiser listings starting at $1,995.

ZIP:

Search Chrysler PT Cruiser Questions

Chrysler PT Cruiser Experts

#1 Tom Demyan
Tom Demyan
Reputation 1,450
#2 Gypsy Rose
Gypsy Rose
Reputation 930
#3 docwade931
docwade931
Reputation 900
View All

Related Models For Sale

Used Chevrolet HHR"
123 Great Deals out of 3,918 listings starting at $599
Used Volkswagen Beetle"
204 Great Deals out of 9,227 listings starting at $500
Used Chrysler Sebring"
64 Great Deals out of 4,436 listings starting at $999
Used Toyota FJ Cruiser"
100 Great Deals out of 2,538 listings starting at $8,995
Used Honda Civic"
909 Great Deals out of 56,226 listings starting at $995
Used Chrysler 300"
498 Great Deals out of 22,565 listings starting at $2,490
Used Honda Accord"
1,201 Great Deals out of 74,101 listings starting at $500
Used Ford Focus"
950 Great Deals out of 61,758 listings starting at $1,000
Used Ford Mustang"
664 Great Deals out of 45,885 listings starting at $1,500
Used MINI Cooper"
261 Great Deals out of 11,304 listings starting at $2,450
Used Ford Escape"
1,374 Great Deals out of 90,951 listings starting at $999
Used Jeep Wrangler"
246 Great Deals out of 13,734 listings starting at $2,795
Used Chevrolet Impala"
835 Great Deals out of 31,604 listings starting at $1,000
Used Honda CR-V"
1,105 Great Deals out of 84,036 listings starting at $1,750

Used Cars For Sale