Heat exchange control valve again?!
08-06-2017, 11:07 PM
#1
Heat exchange control valve again?!
Hi Everyone,
About 3 years ago, my 2004 E500 started blowing hot from the rear vents, and after doing some research I found out that I needed to change the heat exchange control valve. I got the part from the dealer, changed it out following pretty much the same steps mentioned in some of the threads here, and everything started work like a charm again. Last February, my car stopped blowing hot air from all vents. Could it be the heat exchange control valve again?! I do not see any error codes from the OBD scanner. The last service I did on it before this problem occurred was the replacement of the radiator hose to the expansion tank and a radiator flush. The car does not overheat or anything, and I think the system is self burping so there should not be any air in there. Any thoughts on how I should go about troubleshooting this problem?
P.S. The A.C. blows ice cold air in the summer
About 3 years ago, my 2004 E500 started blowing hot from the rear vents, and after doing some research I found out that I needed to change the heat exchange control valve. I got the part from the dealer, changed it out following pretty much the same steps mentioned in some of the threads here, and everything started work like a charm again. Last February, my car stopped blowing hot air from all vents. Could it be the heat exchange control valve again?! I do not see any error codes from the OBD scanner. The last service I did on it before this problem occurred was the replacement of the radiator hose to the expansion tank and a radiator flush. The car does not overheat or anything, and I think the system is self burping so there should not be any air in there. Any thoughts on how I should go about troubleshooting this problem?
P.S. The A.C. blows ice cold air in the summer
Last edited by medootoo; 08-07-2017 at 08:38 PM.
08-08-2017, 12:05 AM
#2
The hear exchange valve is a mechanical part, no sensors, so I dont think you'll get an error from the scanner.... I thought the issue with the heater was that it's blowing hot air instead of cold, at least that's my case, yours seems backwards. Search for a new part number in the epc, maybe you changed it with the same old part number.
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medootoo (08-08-2017)
08-08-2017, 03:22 PM
#3
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medootoo,
PM me your email address and let me know if you want the HVAC diagram for your car. Might help 'cause it sounds like it might possibly be the flap actuators. I would lay money on the heat exchange control valve however.
PM me your email address and let me know if you want the HVAC diagram for your car. Might help 'cause it sounds like it might possibly be the flap actuators. I would lay money on the heat exchange control valve however.
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medootoo (08-08-2017)
08-08-2017, 08:20 PM
#4
Will do! Any ideas about how I should troubleshoot the problem?
08-08-2017, 08:29 PM
#5
Now I have AC blowing ice cold air from all vents even when I have the AC on high.
This is the part no. 211 832 05 84
Isn't there an electrical connector to this valve?
08-08-2017, 08:35 PM
#7
The hear exchange valve is a mechanical part, no sensors, so I dont think you'll get an error from the scanner.... I thought the issue with the heater was that it's blowing hot air instead of cold, at least that's my case, yours seems backwards. Search for a new part number in the epc, maybe you changed it with the same old part number.
Now I have AC blowing ice cold air from all vents even when I have the AC on high.
This is the part no. 211 832 05 84
Isn't there an electrical connector to this valve?
