wiring problem

Asked by Feb 19, 2017 at 03:52 PM about the 1996 Pontiac Sunfire 2 Dr GT Coupe

Question type: Maintenance & Repair

every time o turn on the ac or defrost the engine revs above 2500 rpm and
stays there. if i turn off the a/c or take the selector off off defrost the rpm
returns to normal. Any ideas?????

1 Answer

80,325

Faulty IAC (Idle Air Control) valve. When air conditioning and defrost are selected the computer is supposed to speed up the idle about 500 RPMs to prevent stalling from the added load of the air conditioning compressor. Sounds like the IAC is opening up too much and so the idle goes up more than it's supposed to. HTH. -Jim

1 people found this helpful.

Your Answer:

Pontiac Sunfire Experts

  • #1
    John Saffrahn
    Reputation
    2,990
  • #2
    Joeyadams
    Reputation
    1,430
  • #3
    Warren0007
    Reputation
    1,270
View All

Related Models For Sale

Used Pontiac Firebird
20 listings starting at $12,999
Used Pontiac Grand Am
22 listings
Used Honda Civic
117 Great Deals out of 4,891 listings starting at $100
Used Toyota Corolla
115 Great Deals out of 4,251 listings starting at $2,300
Used Chevrolet Camaro
6 Great Deals out of 999 listings starting at $4,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.