A/C makes RPM higher?
08-24-2010, 05:06 PM
#1
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Location: KS
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Year: 2000
Model: Cherokee
Engine: 4.0L
A/C makes RPM higher?
Hi I've noticed that when sitting idle and if I turn on the a/c my RPM actually goes up a little bit. Nothing too high or anything just to the 1 mark or lower. What could this be?? Cars a 2000 cherokee sport
08-24-2010, 05:11 PM
#3
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Year: 1993, 1994
Model: Cherokee
Engine: 4.0L HO
08-28-2010, 09:14 AM
#5
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Year: 1997
Model: Cherokee
Engine: 4.0L
I believe the IAC (idle air controller) kicks up the idle when it senses a load. If it's set perfectly the idle should stay the same. Yours may be dirty and it can be cleaned. Engines with carbs used a vacuum controlled system called a dashpot to maintain the ide speed with the A/C on.
08-29-2010, 11:36 PM
#7
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Year: 1997
Model: Cherokee
Engine: 4.0L
That would be my first guess. It's not too hard to clean from what I've read. I just replaced mine. There's a lot of IAC posts here...do some searching before you start throwing money at it.
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