s40 aircon/hesitation

I would suspect your a/c needs a recharge, as its sapping more power than normal with a partial charge. I had exactly the same thing on our S70- a huge power drain whilst the compressor was engaged. A recharge, and its much better.

Tim..

thanx tim,hadnt thought of that.will drain and charge it and let you know

"apache" wrote: > i have a 2001 y s40 1.8 (volvo engine) and have a wierd > one.when switching the aircon on either by demisting the > screen or manually,the engine note and feel changes > noticably.i am in the trade and am aware that a/c loads the > motor but this is different,it actually feels as though the > engine is running lean or retarded,it hesitates and if your > cruising and switch on the a/c you can feel it holding > back.swith off and it clears.its like the coil packs are > arcing,that feeling.ive had it code read by an ind specialist > with the propper software and no codes were stored.can anyone > help.we heard the ecu"s had a program update but that didnt > help.other than this it goes lovely w/o aircon and is very > good on fuel.any ideas