My '93 190E 2.3 idles at 750-800 in park, 700 in drive, but when I turn on the A/C it drops to 500. It used to idle at 650-700 with the A/C on in drive.

Is there a main component that adjusts the idle speed when the A/C is turned on?

Thanks,

Dave

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible