2008 Transporter td5 ac/alt coupling

[metfast]

Our 2008 duel cab transporter td5 6 speed manual 165000km.
We are getting a high whistling sound when when accelerating ect doe's not do it on idle.
Dealer says its the ac/alt coupling what one i don't know as far as i can see there is two one for ac one for alt.
quoted $800.00 to repair but why the whistling noise what doe's it.
Any theories on this.

[Syncrotek]

At 165,000km, they should have been replaced by now, if a dealer has been doing regular servicing, so double check to find out
if they have or not. If time is not a worry parts can be purchased from Europe at about 1/3rd to 1/2 the cost, then either fit them
yourself if able, or find a reputable mechanic. The noise is usually a mechanical squealing sound, caused by the worn out clutch
coupling.

[Rebuild]

Is it whistling when revving in neutral as well?
If not, i don't think it's the coupling

how long has it done this?

You sure its not normal turbo whistle, comes in around 1800-2000rpm?

I'm around 150K on mine, alt coupling has about 1mm freeplay.You can check yours yourself, easily enough

[metfast]

Thanks to you both for the reply.

(Rebuild) Yes it doe's whistle in neutral and has about 2ml free play. It has been doing this for 6months 4000km.

(Syncrotek) No i do basic service myself, dealer wants $385.00 for oil change "they are dreaming"
We have only had it 18months and done around 18000Km in it, we use it as a back up work vehicle and personal transport at weekends. As i have never come across anything like this before i was not sure. Volkswagen are not the norm as i am finding out.

[Syncrotek]

Continued driving with a faulty freewheel clutch has the potential to damage the compressor or alternator, whichever one is
making noise. The compressor shaft spline damage will mean a replacement compressor. The alternator can also suffer
vibration damage. (Unless the rubber couplings strip before damage happens)

[metfast]

Thanks for that Syncroteck, that was going to be my next question, will now be getting it fixed ASAP.
When dealer quoted $800.00 i am now thinking they mean for the pair, they are about $200.00 ech on Ebay Aust.
Thou i will leave it to Bret our mechanic " Huntingdale Auto Davison st Maddington 6109" i have faith in them.
Once again thank you both for your help it has made my feel better and assured i was not getting dealer bulldust.

[metfast]

Thanks all of you that replied, after close inspection from my mechanic it turns out to be a cracked manifold gasket. So there it is a big misdiagnosis by Southside VW Cannington W.A

[Sunny43.5]

Is it just the gasket ? as there are known issues with the actual manifolds themselves cracking .Check this link it may help you and the mechanic .Cracked Manifold

[Murphenzo]

Continued driving with a faulty freewheel clutch has the potential to damage the compressor or alternator, whichever one is
making noise. The compressor shaft spline damage will mean a replacement compressor. The alternator can also suffer
vibration damage. (Unless the rubber couplings strip before damage happens)

Let me put my hand up here and say I learnt this the hard way with my AC compressor.

[Murphenzo]

Is it just the gasket ? as there are known issues with the actual manifolds themselves cracking .Check this link it may help you and the mechanic .Cracked Manifold

Haha can I just put my hand up here and say I learned about the crack exhaust manifold the hard way too.

Fortunately, or unfortunately depending on how you look at it, the only two things that have gone wrong.