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Air con pump noise

Mark Elder

Mark Elder

PCGB Member
Member
Suspect I have a bearing going in my air con pump.

After I've been driving for half an hour or so I get a noise from the rear - best described as a loud electric motor (a drone like an underground train - but not quite as loud!). Can only hear it when I slow down to less than 40mph. It's engine speed related. Switch off the air con and noise immediately stops. Giving the pump a rest for a few minutes seems to fix it, but half an hour later it's back again.

Have done a search but have not found any previous threads on this, but I have a vague memory of it coming up before.

Anyone seen similar?
 
I don't know how handy you are with the spanners Mark, but I was thinking of giving mine a service.

One of the boys on the 944 site has put up a super log of what he's done:

http://www.porscheclubgbforum.com/tm.asp?m=708550

I thought my 993 wouldn't be much different (My 944 hasn't such niceties as AC or windows for that matter :)



 
Doesn't part of a recharge includes a small amount of special synthetic oil to lubricate the pump ? I am sure my guy included some as routine.
 
Wow - this is an amazing post. The compressor is a beautifully engineered piece of kit. Might be beyond my skill level - e.g. I will need to buy a cir-clip remover (and learn to use!) - but as it looks so well made it would be a crime not to have a go.
 

ORIGINAL: Geoff997

Apparently the pumps can become noisy if refrigerent is low. Worth checking before pulling pump out.
Click to expand...

Yes - read this elsewhere - but my air con seems to be keeping car nice and cool.

ORIGINAL: John Maddox

Doesn't part of a recharge includes a small amount of special synthetic oil to lubricate the pump ? I am sure my guy included some as routine.
Click to expand...

ah - that might be problem - I used Kwikfit and I bet that's the kind of thing they omit. That was nearly two years ago - but I guess it might not show up immediately.
 
Bitter experience argues to me that there are not that many really competent air-con service and diagnostic people out there, and I am therefore inclined to agree with the last poster, in as much as a re-gas with a suitable lubricant may be all that is required.

Is the noise definitely coming from the rear of the car? I had a problem on an Audi A8 that was diagnosed as pump bearings but which turned out to be the bearings on the fan which kept the air-con radiator cool when the car wasn't moving quickly.... That cost me 10 seconds with some spray lubricant to fix rather than the £400 or so quoted by the aircon "specialist" for a replacement compressor.
 
Blaming kwik fit for not putting in lubricant may be a little harsh. on a normal recovery and recycle /recharge of an air con system very little of the oil is recovered so their is no need to put any back in and their equipment is likely to be fully automatic so will replace what is recovered. When each item is replaced ,Porsche specify how much oil must be added to the system for the item in question.so if the oil is low it begs the question of what parts have been replaced in the past and not to a particularly high standard.
Christian..
 
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