If it`s only noisey with the aircon switched on your aircon compressor drive pulley may be loose.It`s held on by a small nut and they do have a habit of working loose.The noise only appears when the aircon is on because the centre of the pulley (the loose part) is not turning when the aircon is switched off and the magnetic drive is in free wheel mode.If I were you i`d be heading straight to my garage to get it checked and tightened before too much damage is done as a new aircon compressor costs in the region of ?350 - ?400.
I've the exact same thing. With air con on and engine at idle, very
noticable rattle from engine bay area. It has alwys done this (5 years
old now!) In the meantime the pump has been replaced for a different
problem, and rattle remains. VW couldn't find anything wrong! I believe
it is just something else slightly loose and when the aircon is on, due
to the slighly more load on the engine is alows whatever it is rattling
to do its ting. Increase the revs and it goes away.!
As posted in other threads mine too has the 'noise' - I'm going to change the drivebelt (?26 inc VAT from the dealership) at the weekend and see if it cures the problem. Mine seems to be more pronounced when the car (and the weather) is warm, and can be heard ever so slightly when the aircon is OFF too, which makes me think it 'could' be the belt..
I've checked my compressor pulley bolt, belt tensioner and fans and all are fine.. Its all a bit strange, but I can't leave it alone as it don't sound that cool does it??! hehe
'Unfortunately, VW dealers do not like to work on air conditioning systems and will often sub contract out any work to a local air conditioning specialist. A consequence of this approach is that the only likely course of action that a dealer will recommend is to replace the complete pump even if this is not actually the most cost effective solution to the problem. A replacement pump assembly will cost in the order of ?600 from a VW dealer. Even a new clutch assembly will cost around ?200 from a dealer, and unfortunately it is not currently possible to purchase any major components for the Sanden pumps from any other source.'
It was just shy of ?26 for the belt, from the dealers. I did mine in less than 5 mins without going in from the wheelarch (I have quite small arms and hands which no doubt helped!). Just use a 15mm spanner in a clockwise motion on the tensioner, insert a drill bit into the 2 holes that you will align when moving the tensioner, and the belt simply comes off the pulleys.
Mine is in at the specialist and has been since Monday morning they say it is a faulty tensioner and damper and also the belt that was on was not a VW belt. so he is going to replace them and the engine mount bolts aswell as they are stretched. Total cost ?305.
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