Hi, had my car in garage for quick inspection to see if can locate ticking noise, the mechanic had good look/listen ramp up/ramp down etc, he seems to think the ticking might be coming from air con, he got me to switch air con on and he said it may be that it needs re gassing as he didn't hear the compressor kick in, (should i hear compressor) he listened directly to air con pump (I think) and said that is ticking. Told me to try re gassing....

RIGHT my own update,,, iv had another look listen myself and I am even more convinced it is the silver vacuum pump (top of engine at front) can I take it off and inspect and put back on or do I need gaskets etc...

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BMW 2003 e53, x5,
3.0d sport.
Black in
Black out.