s40 aircon/hesitation

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

 

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
kno