Noisey AC on C4S:

[Por911T]

I've got a Porsche 996 C4S which has a light drone/whine when the AC is running - the car has was serviced and regassed at Porsche in Glasgow about 4 weeks ago and they said after being gassed it was fine , it also appears to running cold enough too . But the whine is really annoying me, turn the AC off and the noise disappears immediately ..... Any suggestions ???

Appreciate any feedback ......will also post under the Porsche forum

Cheers , Barrt

[sportsandclassic]

Hi,

There may be a leak somewhere in the system, the noise is normally from a low amount of gas.

Hopefully the porsche centre who regassed the system put a leak detection dye in it to trace the leak.

Look underneath the car on drivers side under the sill area.... There will be two long metal pipes check that they are ot leaking fluid from the front or rear of pipe. Quite a common failure point along with the normal front condensers.

Mike

[F3RNANDO]

Replied in regional section....also wot he said.

[monstro]

i'm agreeing with the previous replies, imo it will be low on gas, and you have a small leak somewhere - i would guess condensers as they are what tends to go first - I had the same in mine a couple of months ago, started making a noise, regas stopped it for a while only for it to come back a few days later, traced it to one of the condensers leaking slightly - the aircon guy I used actually sprayed washing up liquid and water mix all over the condensers and we saw it blowing bubbles at the top of the offside condenser.

Thinking I would replace the pair of them whilst I had the PU off, I bought cheap pattern copies and struggled to get them to fit - so much so that I ended up only fitting the one - to replace the leaking one. The mounting brackets on the reproduction condensers were welded so far out of alignment that I struggled to fit one and couldn't get the other one any where near close enough to fit! lesson learnt - stick to the expensive OE parts in the future!