IDLE UP when AC Compressor kicks - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-29-2011
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IDLE UP when AC Compressor kicks

I searched and I couldn't find this specific question.

About every 10 seconds the AC compressor clicks and then the idle goes up a bunch for two seconds or so, then goes back to normal.

The happens over and over when the AC is on.

Just had new plugs and wires (good ones). The truck did this BEFORE that though.

It's like it's constantly CLICK..REV....down....CLICK...REVVVVV, down...CLICK revv down...

does this sound like low coolant, or IAC, or what?
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Old 04-29-2011
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its the compressor kicking on and the IAC doing its job bumping up the idle. the compressor is stealing power for a second till the IAC replenishes power
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Old 04-29-2011
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Originally Posted by 04RangerDave View Post
its the compressor kicking on and the IAC doing its job bumping up the idle. the compressor is stealing power for a second till the IAC replenishes power
I was thinking that as well dave.

It seems to be doing it excessively. Could it be undercharged or overcharged?

Constantly cycling and bumping the rpms!!!
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Old 06-19-2011
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Def undercharged! If it's low on 134a then it will make the compressor turn off an on more depending on how low it is! U'll need to find the leak cause the gas has got to b escaping from somewhere. They sell kits at the Auto Parts Stores with a dye in the 134a an a pair of glasses to be able to see the place where the dye is leaking from!! Hope this helps!! Good luck!!
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