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Engine idle speed drops when AC kicks on

Everything on the Volvo S80. Sometimes called an "executive car", the S80 was Volvo's top-of-the-line passenger car. P2 platform.
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MaineVette
Posts: 3
Joined: 16 October 2010
Year and Model: 1998 S80
Location: Maine

Engine idle speed drops when AC kicks on

Post by MaineVette »

Recently I've noticed that when the car is idling when the AC kicks on, the engine idle will momentarily drop by about 250 rpm. This is pretty annoying because it causes the car to shudder a bit and just doesn't sound very good.

Any ideas on how to fix this?

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billofdurham
MVS Moderator
Posts: 6507
Joined: 2 February 2006
Year and Model: 855, 1995
Location: Durham, England
Been thanked: 5 times

Post by billofdurham »

Once the compressor kicks in it puts a load on the engine causing the revs to drop, which is normal. There is an idle-up incorporated which will bump the revs up by 100-200 to compensate.

Bill.
Work was good - retirement is better.

1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.

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