SLK SLK250 SPORT CDI No Heat

akranes

New Member
Joined
Dec 7, 2021
Messages
3
Location
Warwickshire
Car
SLK250 AMG SPORT CDI
Hi All.

Just joined this forum and looking for some help please.

I have a SLK250 CDI .... 14 plate. There is no heat regardless of the temperature set. Its only blowing cold air and the two center vents blow nothing at all.
The engine is up to temperature.

Does anybody have any idea what the problem might be please?

Thanks in advance
 

wongl

MB Enthusiast
Joined
May 29, 2005
Messages
1,390
Location
Surrey and Hong Kong
Car
A180CDI, B200d, C300h, SLK250
Hi All.

Just joined this forum and looking for some help please.

I have a SLK250 CDI .... 14 plate. There is no heat regardless of the temperature set. Its only blowing cold air and the two center vents blow nothing at all.
The engine is up to temperature.

Does anybody have any idea what the problem might be please?

Thanks in advance
This is likely to be your duo valve - it is located behind the radiator. I had on the same problem on mine and was preparing to clean it out or out right replace it. But before I went through the trouble of taking the valve off, I tried turning the heating full on and off several times with the engine running and warmed up. Eventually after about 10 mins of cycling the temp control from cold to max, I started getting warm air and now the heating on my SLK is fully working again.

You can try this. Good luck.
 
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OP
A

akranes

New Member
Joined
Dec 7, 2021
Messages
3
Location
Warwickshire
Car
SLK250 AMG SPORT CDI
Thanks very much. I'll have a look for the valve and try your idea. I'll let you know what happens.

Cheers Marc
 
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OP
A

akranes

New Member
Joined
Dec 7, 2021
Messages
3
Location
Warwickshire
Car
SLK250 AMG SPORT CDI
Hi All.

Just joined this forum and looking for some help please.

I have a SLK250 CDI .... 14 plate. There is no heat regardless of the temperature set. Its only blowing cold air and the two center vents blow nothing at all.
The engine is up to temperature.

Does anybody have any idea what the problem might be please?

Thanks in advance
Update.

It appears the heater stepper motor was accidentally disabled. A mechanic on a previous service had disconnected one of the motor electrical connections whilst replacing the pollen filter. Luckily the mechanic I took the car to discovered this quite quickly. So there you go a simple fault in the end.
 

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