bad idle with air con on

[pla_inter]

Hi guys,

Im getting a rough idle in my ED auto when I have the air conditioning switched on. The needle moves erratically (never over 1000rpm) and there is a sort of a clicking sound which if I didn't know better I would almost say sounded like a gear change...

This also happens when Im moving at very low speeds. At the car park this morning it was very annoying as my car would be going "click click click" with the rev needle moving up and down very fast.

Doesn't seem to be a problem with air con switched off or with the heater switched on.

Any ideas?

[fairmont au]

your air conditioning gas is low
probably almost out
click is the air compressor trying do its job with little gas