C-Class (W202) 1995-2000: C 200 CDI, C 220 CDI, C 270 CDI, C 180, C 200 K,C 230 K, C 220, C230, C 280

Heating problem with an c220

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Old Jun 8, 2016 | 12:36 PM
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mercedes c220 c36
Heating problem with an c220

i have an mercedes w202 c220 -1993 with problem with the heating system. its only blowing warm air into compartment no matter what i put the adjusters on. I have switch to another duo valve due to i've heard that it might be the problem. But it didn't fix the problem. What more can i try to do about it?
Is there any fuse or anything that can cause this kind of problem?
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Old Jun 20, 2016 | 08:36 AM
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mercedes c220 c36
Originally Posted by Plutoe
Assuming the engine coolant is hot, the coolant circulation pump provides the movement of the coolant through the system---the duo valve is the regulator of the amount of coolant that goes to the heater cores(R or L)---

Therefore if you are saying that when the temp wheel is set to max red and the blower speed is set to high and you know the duovalve is open----you do not get hot air---if that is the case then you either have a faulty coolant circulation pump or faulty heat control module!!

Yes it was the control module. A destroyed resistor. Wasn't able to dicide the value of it to i switch the whole module and now it's working fine =)
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Old Feb 10, 2017 | 10:34 AM
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1995 C220
I have a 1995 C220. My heater don't seem to heat the car efficiently. What may be causing this - coolant need to be replaced or sometime else. Please advise.
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