ML320 Heat instead of AC
Thread Starter
Newbie
Joined: Jul 2010
Posts: 7
Likes: 0
ML320
ML320 Heat instead of AC
I have a 2000 ML320. Recently the AC has not been blowing cold air. I was checking it today & turned the temp control to heat & back to cool & it started to blow heat continuously. I moved the switchback & forth & then it started to blow cool air after about 10 minutes. The center vent blow cool & the 2 side vents still blow moderate to warm air. I checked the fuses, there OK, I can hear the pump kick on & off. I also noticed that the recirculation button docent seem to be working…Any ideas. Do not have a diagram of the ducting so not sure if the chamber flaps are working correctly of if it is in the control switches...
Newbie
Joined: Apr 2013
Posts: 1
Likes: 0
1998 ML320
I have the same issue. The A/C was blowing cold air then started blowing hot air. I moved the temperature knob from hot to cold/ cold to hot, and started blowing cold air. Now the car got stuck blowing hot air eventhough knob temperature is pointing to Cold. Any advise?
Please help.
Please help.
Junior Member
Joined: Oct 2013
Posts: 70
Likes: 0
From: Mn
2006 ML 350 sold, 2014 Bluetec "Rudy"
If you are talking about a 2000 or older, remove the wood surround trim, then remove the fan, temp, direction assembly. Look on back where there is a nylon bushing than snaps into a bracket. I would guess that a tab has broken and your nylon bushing than the cable goes through is just hanging there so it cannot move what the cable needs to move. You can buy new/used off ebay or use JB Weld to fix it with some reinforcing. I did and it still works.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
I have the same issue. The A/C was blowing cold air then started blowing hot air. I moved the temperature knob from hot to cold/ cold to hot, and started blowing cold air. Now the car got stuck blowing hot air eventhough knob temperature is pointing to Cold. Any advise?
Please help.
Please help.
Do you have a DVOM and do you know how to use it?
