Air con problems 2005 Multivan

[minniemousey]

Hi there, just wondering if anyone can help with a problem with my air con that's now not working...?

A few weeks ago, we noticed that when the air con was running, the fan noise was normal but when we turned the air con off or down, the fan would be heaps noisier and rattly. Today the air con is not working at all but the fan still does. The rattling has also stopped.

I've looked at the fuses and they all look good. Any other tips or tricks please?

[Transporter]

It's either elastic coupling or A/C pump itself. Independent VW workshop (or VW dealer) should be able to help you with that.

What engine and how many km have you done?

(it's always a good idea if someone asks for help or advice to quote what engine, how many km's car traveled and other details that may be useful)

[minniemousey]

It is a T5 128kw 2.5 tdi auto on 160000 km if that helps
cheers

[Umai Naa!!]

Quite possibly a drive coupling on the compressor. As for the fan noise, it may have ingested something.

[BrianJ]

Mine went at 70,000km, stripped the spline on the input shaft to the aircon compressor, the gates couping was perfect but the ratchet hub was siezed. Unike most compressors that kick in with an electric clutch whenever needed, the VW one runs all the time and the output is regulated by valves on the output side. Consequently, they would be likely to wear out much sooner as they run 100% of the time.

New hub and new compressor set me back $AU2000 and left me wondering when it will fail again. And not using the aircon won't help either, you feel like you better use it all the time to get your moneys worth before the next failure.

Brian

[minniemousey]

Thanks for your replies. It has always been serviced at a VW dealer and the coupling should have been changed at the 150,000km mark. There's nothing to say on the paperwork to say that it was though. The last post makes me very nervous about taking it in to be checked. $2000 geez!!!

[Scouser]

My 2006 2.5 Multi aircon stopped wofking today?
Where is the coupling located so I can check?
Thanks

[Umai Naa!!]

Above the front engine mount.

[Scouser]

I am presuming its the coupling?
The heater works great and up until yesterday I hadnt run the aircon for a couple if months,it had worked great ,tried it yesterday and it wont cool!
Any other things to check or will it be the coupling?
Thanks

[Umai Naa!!]

Only way to properly check the coupling is to remove the front engine mount and brackets, undo the three bolts that hold the compressor in, and pull the compressor far enough out that the coupling can be removed.

Once you've gone that far, you might as well check the one for the alternator too.

If the coupling is OK, get an air con guy to test the refrigerant quantity and compressor operation.