83 300sd rpms drop with a/c on, rough idling

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83 300sd rpms drop with a/c on, rough idling

08-17-1999, 02:17 PM

alwong

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I drove my wife's 300sd for the first time in months, and noticed the rpms drop from around 750 to 500 rpms witht he A/C turned on. Is this normal? I don't recall this ever happening, and it doesn't happen on my 190E.

When the rpms drop, it idles a bit rough, and appears to be lacking power when accelerating from a complete stop.

Any suggestions?

Al Wong
83 300SD
85 190E

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