Replace the compressor or recharge the system? The engine will be
under load as the AC in on, to much load means something is working
overtime. At idle in gear my 400E goes from 600 rpms to 450, It might
be pretty close or your engine is getting old. Was it different
Thanks for the reply, sorry to mention that the idling speed was normal week
ago, it was 850rpms (speed drop to 650 for one second then back to 850rpm)
even after switching on the a/cond.
It seem something is controlling and to increase the idling speed while
air-cond is switching on ?
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