Will the air condiditing only run effectively when the car's going over 40mph?

30

Asked by Aug 24, 2013 at 04:03 PM about the 2000 Pontiac Sunfire

Question type: Maintenance & Repair

My brother bought a 2000 Pontiac Sunfire a few months ago. They were apparently assured by the mechanic when the took it in that they could get air conditioning working for $450. The air would seem to work for a little while then after a day or so it would only blow cold/cool air if the car is going over 40mph. $1300 and several return visits later supposedly the whole air conditioning system has been replace the mechanic is telling him that's just how the air for that particular model works. Is that accurate or BS and what are his best options at this point?

Thank you
gb

6 Answers

108,725

Check to see if electric fan at radiator is coming on when ac is turned on.

30

He says it looks like the fan is coming on.

1 out of 1 people think this is helpful.
108,725

It should be very obvious that it is on. If its not coming on or not blowing real hard I would check into why not. This could cause ac not to cool properly at idle or low speeds.

108,725

Does your ac blow good and strong out the front vents when driving but blows weak or changes to defrost vents when you slow down?

1 out of 1 people think this is helpful.
30

It blows really strong out the front when its set to recirculating and driving. It weakens and gets warmer at slower speeds or in park but the doesn't change vents. Thank you for trying to help us figure this out.

2 out of 2 people think this is helpful.
108,725

Ok with what you have described it sure sounds like the radiator fan is not operating properly. If its not blowing properly the freon will not cool properly and will cause the compressor to turn off at lower speeds or at an idle. Look at the front of the compressor where the belt goes on it. Make sure that the clutch on compressor is ingaged and spinning. If not its either a radiator fan issue or a low freon issue. If it is spinning feel the ac lines. Are they cold? If so then check the dampers in the duct work of the vents. If yours is controlled by vacuum they could be closing when you slow down due to a vacuum leak somewhere.

Your Answer

Add photo

Related Questions

Sunfire

Looking for a Used Sunfire in your area?

CarGurus has 316 nationwide Sunfire listings and the tools to find you a great deal.

ZIP:

Search Pontiac Sunfire Questions

Pontiac Sunfire Experts

#1 John Saffrahn
John Saffrahn
Reputation 2,670
#2 Joeyadams
Joeyadams
Reputation 1,310
#3 Warren0007
Warren0007
Reputation 1,230
View All

Related Models For Sale

Used Chevrolet Cavalier
1,054 listings
Used Pontiac Grand Am
1,221 listings starting at $950
Used Pontiac Firebird
8 Great Deals out of 730 listings starting at $1,800
Used Ford Mustang
365 Great Deals out of 46,760 listings starting at $1,500
Used Honda Civic
483 Great Deals out of 87,418 listings starting at $1,499
Used Chevrolet Impala
520 Great Deals out of 28,982 listings starting at $1,100
Used Nissan Altima
837 Great Deals out of 78,629 listings starting at $1,677
Used Pontiac Grand Prix
21 Great Deals out of 2,843 listings starting at $1,995
Used Chevrolet Camaro
152 Great Deals out of 32,722 listings starting at $1,995
Used Toyota Camry
822 Great Deals out of 88,963 listings starting at $599
Used Chevrolet Malibu
802 Great Deals out of 80,971 listings starting at $995