2002 Coupe heating problems...
Thread Starter
Almost a Member!
Joined: Nov 2002
Posts: 60
Likes: 0
From: Orange County, CA
2002 C230K Sportcoupe
2002 Coupe heating problems...
This is odd, and not the documented behaviour, so I wanted to see if anyone else had experienced this. I have a 2002 coupe, standard (analog) HVAC controls.
When I operate the unit in Auto mode with AC On (not EC mode), it seems to work fine.
If I turn on 'EC' mode (AC OFF), the air starts coming out very hot, regardless of the temp. setting (outside temp 79F, both temp knobs turn FULL LEFT (64F), the air is still scorching, like the heater is on full blast. The position of the 'cold air' wheel doesn't seem to matter. Turning the AC on again returns the system to normal (cool air), but once switched off, it's normal for about 10 minutes and then starts blasting hot air again. Happens with AUTO mode set to ON or OFF, doesn't matter, if EC is ON (AC is OFF), the air comes out heated.
Is this normal? Does the fresh air intake go through the intercooler or something?
TIA
When I operate the unit in Auto mode with AC On (not EC mode), it seems to work fine.
If I turn on 'EC' mode (AC OFF), the air starts coming out very hot, regardless of the temp. setting (outside temp 79F, both temp knobs turn FULL LEFT (64F), the air is still scorching, like the heater is on full blast. The position of the 'cold air' wheel doesn't seem to matter. Turning the AC on again returns the system to normal (cool air), but once switched off, it's normal for about 10 minutes and then starts blasting hot air again. Happens with AUTO mode set to ON or OFF, doesn't matter, if EC is ON (AC is OFF), the air comes out heated.
Is this normal? Does the fresh air intake go through the intercooler or something?
TIA
MBWorld Fanatic!
Joined: Nov 2001
Posts: 3,744
Likes: 1
That is not normal. It sounds like the air is being sent through the heater core even when it is not necessary to do so. You should have the dealer take a look at this.
The intercooler is not connected to the HVAC in any way.
The intercooler is not connected to the HVAC in any way.
Thread Starter
Almost a Member!
Joined: Nov 2002
Posts: 60
Likes: 0
From: Orange County, CA
2002 C230K Sportcoupe
Yes, I know the Intercooler isn't connected, that was just a joke. 
..But I'll call the service dept. and have them take a look. It could use a wash anyway...
Thanks!
..But I'll call the service dept. and have them take a look. It could use a wash anyway...
Thanks!
Almost a Member!
Joined: Aug 2002
Posts: 38
Likes: 0
From: New Hampshire
C240
I had a similar problem except it was a little worse. Mine was stuck on hot and the air would only come out by my feet. I brought it in and they had to replace the wiring harness. When they installed my CD Changer they damaged the wires.
