[daredavil87]

I have reviewed many articles in the forum but stiil haven't resolved my problem ,
I have a w210 e300td 1999 that blows hot air from every vents ,just the center vents are working fine (the two on the dash up to climate control unit).
I checked the duovalve and repaired it .Recirculating pump if fine.I did a diagnostic and no error codes were find .when engine is cold the air is cols from all vents , when engine is warming , the air warms too.
Here are my live data from the climate control unit after 5 minutes from engine start:
(temperature is in degrees celsius)
1 22
2 13
3 48
4 49
5 08
6 56
7 15
8 60
9- 03
10 2.3
11 2.5
12 4.3
20 2.0
21 06
22 00
23 100
24 12.9
40 74
41 30
42 72
43 136

Can someone please tell what might be the problem :crybaby2:

 

[AvalancheCCM]

Something is not right with the duovalve. Your symptoms are classic of the duovalve, and your 3 and 4 measurements are high which means the valve is letting hot coolant into the heater. The #1 measurement is normal so at least your climate control doesn't think it's freezing in there.

I think it's suspicious that both are high. Usually just one side gets stuck. I think the signal to the duovalve is the problem. Maybe check the connection at the valve?

 

[Yacht Master]

+1 duovalve

and your Evaprator sensor is claiming 08*C so it is cooling.

 

[SkippyJasper]

Daredavil87,

Maybe unrelated observation.
If these readings are with the motor running your voltage is a tad low. #24 is showing 12.9 when 13.1 to 13.5 would be expected.
Let us know if motor was running or off.

Skippy

 

[atmsmshr]

Something is not right with the duovalve. Your symptoms are classic of the duovalve, and your 3 and 4 measurements are high which means the valve is letting hot coolant into the heater. The #1 measurement is normal so at least your climate control doesn't think it's freezing in there.

I think it's suspicious that both are high. Usually just one side gets stuck. I think the signal to the duovalve is the problem. Maybe check the connection at the valve?

^^+1^^

 

[daredavil87]

just figured out that the flaps are faulty , i'll explain later what i did