Problem with heating in my W211 E320 CDI

[memzey]

Hi all!

For the past day or two no matter how I set the environment controls in my E class, it seems to be freezing! Has anyone else encountered this or have any idea how I might resolve it?

Thanks in advance!!

[Dieselman]

It sounds like the duo valve has gone South. Unusual to be cold though, normally they jam wide open so are too hot.

[memzey]

Cheers DM. Is there any where in or near St Albans I can pop in and have this rectified?

[GordonTarling]

It has been known for duovalves to stick - It'd be well worth giving it a 'technical tap' before spending any money.

[swithin]

Hi, with my sl i have an ec button which switches off the aircon all together. Took me months to figure this out or at least read the manual. Aternatively i rev my car up a bit or accelerate a bit harder to get some warmth in it, poss dual vale problem, but this works.

Hope this helps

g

[memzey]

It has been known for duovalves to stick - It'd be well worth giving it a 'technical tap' before spending any money.


Thaks mate. where should I aim this technical tap?

[ckember]

Cheers DM. Is there any where in or near St Albans I can pop in and have this rectified?

direct mercedes in Hemel do some servicing, there is also a specialist in Ashton Clinton just off the A41.

[Dieselman]

The duo valve is just under the brake master cylinder in the scuttle area.

[television]

Its called a change over valve now on the 211

http://www.detali.ru/cat/oem_mb2.asp?TP=1&F=211226&M=648%2E961&GA=722%2E626&CT=F&cat=64V&SID=83&SGR=181&SGN=05

It also has a re circulation pump

[Dieselman]

And it isn't a master cylinder either but I ddin't want to confuse the O-p.:p

[memzey]

Thanks! So can I get access to this just by popping the hood or do I need to dismantle stuff?

[television]

Thanks! So can I get access to this just by popping the hood or do I need to dismantle stuff?

Its 30 in the link I put up and looks the same as in the picture with 3 pipes

[Frank O' Phile]

First check the fuse. This can cause similar problems. I checked mine when it developed the same symptons and it wasn't blown. However, just before I was due to strip the duo valves, I checked it again and found it to be cracked!.

Simple fuse replacement solved everything.

Always worth a try, maybe Malcolm can point out the appropriate fuse number.

Hope this helps.

[memzey]

Thanks! Fuses are in the boot right? Does anyone know which fuse I should be checking? And to be honest I'm still not sure as to where the change over valve actually is?

[television]

The fuses are everywhere and I have just shut down my main computer for a bit

the boxes are in the link

http://www.detali.ru/cat/oem_mb1.asp?TP=1&F=211026&M=648%2E961&GA=722%2E626&CT=F&Cat=64U&SID=54

[memzey]

Sorry guys, I don't mean to sound dim but I'm still no nearer to knowing where the valve or the fuses are? Is the valve under the bonet? If so, does anyone know how I can navigate to it?

[BlackC55]

Look under the brake fluid resevoir.