car idle

[nortyhat]

ok when im in park and i turn my heater on my car idles real low like its about to turn off then it jumps back up. but my car doesnt go off but it idles down close to zero. but it doesnt do it when i dont have the ac or heater on.

 

[Frogman]

Maybe the A/C switch is out? It's a switch that tells the computer the A/C compressor is engaging, so the computer compensates for it by injecting a bit more fuel into the engine.

 

[nortyhat]

yea i called the dealer that but i really didnt want to believe him because you know how the dealer is. but thanks does anybody else have any suggestions if it isnt the compressor.