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Idle up and down when A/C is on

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Old 05-03-2018, 02:44 PM
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Idle up and down when A/C is on

I noticed that when I turn the A/C on my idle vacillates up and down and doesn't stay consistent. Is this the IAC valve?

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Old 05-03-2018, 04:00 PM
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The computer is supposed to bump up the idle RPM when the compressor is active. Most of the time we have seen too large of a RPM increase the A/C system was low on charge.
 
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