Get the latest advice about your car

Get Started
Advice » Q&A » 2002 Chevrolet Cavalier

Q&A

Ask Your Question

2002 Chevrolet Cavalier

Question: engine revs up and down when idling, only when A/C is on

Question

ostizzle41, 2.2L 4 Cylinder, Los Angeles, CA, October 04, 2010, 22:57
Profile_thumbnail
 Rookie

When I'm idling, the car sometimes revs between 500-1000 rpm, over and over again until i start moving. It generally only happens when the A/C is on....

2 Answers
Answer It
Flag This

  • Answer #1

    shadetreeauto October 05, 2010, 08:08
    Profile_thumbnail
     Journeyman

    this may be normal as the idle will kick up when the ac compressor cycles on and off.

    Reply
    Flag This

  • Answer #2

    Visitor, November 18, 2010, 13:32

    You could have a vacuum leak or the fans are not working. The fuse box in the engine compartment left fender there is a relay for the A/C and one for the heater fan. The one for the A/C controls the fans. Switch the A/C and blower motor relays, turn on A/C, If the fans come on the relay will cost about $10 .

    Reply
    Flag This
Answer Ranks

This week's top 10

1 globalhelper 6 Merrimack Auto
2 milesauto 7 Camster
3 csubak30 8 2004toycam
4 jose8889 9 Transmission-Tech
5 obdcar 10 carpetvan2