W210 220cdi 2000 heater problems

bobef

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E Class 220 2000
Greetings. My Mercedes has a heater that is only giving out very 'tepid' heat.
My mechanic has been looking at the problem.
He has checked the thermostat - that is fine.
He has checked the DuoValves (knackered and to be replaced - is it worth getting one from a breakers ? )
He states they are jammed open so that should mean maximum heat into the cabin??
He has run some degunking agent through thinking there might be problems in the matrix. This has made no difference.
He thinks the heater Matrix needs replacing? Job and a half. How likely is that to be so badly blocked as to need changing?
The car has climate control.
I have read loads of stuff on the Forum here and come across mention of Flap problems.
Can anybody please tell me if my problem might be with the Flaps?

If anybody can offer any guidance i would be very grateful. The though of the dash coming out is scarey - but coming out without need is even worse.

Happy Christmas - BRRRRRRRRR
 

bob 6600

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Audi S8 V10, S210 E320 CDI (R.I.P.)
I replaced mine with a 2nd had unit no problem
 

television

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2002 SL500, 216 CL500, all fully loaded
You can feel the pipes, the ones going into the duo valve should be hot, and with the heater controls set to max heat there should be hot 2 pipes going into the car, you can also measure the voltage on the two outer pins.
 

om613

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S202 C250TD, S123 240TD
Occam's. Likely it's the duo valve.
These cars don't block the matrix in normal use...(which excludes K-Seal / egg whites fixes).
 

mercedes13156

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CLK 200 Cabrio and a Ford Kuga
Same as on another post today. Have you taken the cabin filter out? I've had the same problem - no heat. The cabin filter was completely choked, never having been replaced from new. Filter in bin = working heater.
 
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bobef

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E Class 220 2000
  • Thread Starter
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Thanks for all your help

Will check out cabin filter post Xmas
 

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