Stuck in Germany with Heater on Full!!

[Timster]

Hello.

I'm currently in Germany in my W124. Edinburgh to Berlin in a 21 year old car. No problems on the way over. Yesterday the heater started blowing hot air only, which is rather unpleasant. Can anyone make any suggestions as to how I can fix this before i get cooked on my Journey home on Saturday? Cheers.

Tim.

 

[230K]

Hi

Tap the duo valve with a tool of some description as you put the heater control from hot to cold, it worked for mine till i splashed out and bought a new duo valve.

Hope this helps

230K

 

[BlackC55]

As above. This may work.

 

[MBK]

also if you have a voltmeter you might want to check that your getting power to the duo valve as it defaults to hot air (valve open) when it loses power.

But as above i have had success before with tapping the duovalve with a ratchet whilst someone flicks the dial from hot to cold

K

 

[pos.k]

Alternatively pick up some nice sausages and stuff them down the vents.

By about Belgium, stop for some bread and enjoy!


hope you get it sorted!

 

[Timster]

Cheers all.

Banging the duo valve worked a treat. I'm no longer cooking as I drive!

Cheers.

Tim!

 

[mercedeslover]

Has anybody took their duo valve off and cleaned it. Is it straightforward?

 

[219]

Yes , you can open it up and clean it out : there are six ( or eight , can't remember ) screws on the top - you can undo these and take out the pistons ( watch for losing small parts as you take the top off , also expect some coolant loss ) this may be sufficient to solve the problem . It may be sufficient to do this without removing the entire unit form the car , although that is not difficult to do either .

The duovalves are fairly expensive new , but there are plenty of W124 models in the breakers if you want to chance a used one .

 

[unitfreebie]

CAUTION+++

If you take it apart and do not get it back together properly/tightly, it will leak coolant all over the place!