Air con forces engine to surge 3000rpm! Help!

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Air con forces engine to surge 3000rpm! Help!

S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004.

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Jun 26th, 2017, 11:14	#1
Mickey74 I've Been Banned Last Online: Oct 21st, 2020 21:25 Join Date: Jun 2017 Location: Manchester	Air con forces engine to surge 3000rpm! Help! My car is a 2002 1.6 petrol v40 estate Yesterday, when I turned on the air con, my engine revs started surging up and down (up to 3000rpm !) without any extra pressure on the accelerator pedal. This happened both when idling and cruising speed. When I turned off the air con, then the surging stopped . I have no engine fault codes, my engine temperature is normal. The only thing I have noticed, before this started, is that the force of the air from the air con sometimes dropped off and recovered (otherwise the air is cold). I guess it can’t be the idle control valve as it also happens when cruising ? Also, as the accelerator pedal response is fine, I assume it can’t be a clogged throttle body? Any ideas if this is a classic air con problem ? Any help would be greatly appreciated !

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