230E Always hot air in cabin
Thread Starter
Newbie
Joined: Feb 2009
Posts: 10
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1998 e250d w124
230E Always hot air in cabin
Dear members
I have a 1993 230E in South Africa and in prestine condition with only one problem, namely that with the temperature control wheels in the cold position, hot air still flows into the cabin
I tried to search, but I am either too stupid to find threads or posts or nobody else has ever had such a problem, which I find difficult to believe
I suspect that the problem is with the HVAC heater control valve, also called duo valve or some rheostat perhaps under the dashboard
Can somebody please direct me to threads or walk me through a process of checking where the problem lies
Your assistance will be highly appreciated
Kind regards
Johan Louw ( Logged in as zsjad )
I have a 1993 230E in South Africa and in prestine condition with only one problem, namely that with the temperature control wheels in the cold position, hot air still flows into the cabin
I tried to search, but I am either too stupid to find threads or posts or nobody else has ever had such a problem, which I find difficult to believe
I suspect that the problem is with the HVAC heater control valve, also called duo valve or some rheostat perhaps under the dashboard
Can somebody please direct me to threads or walk me through a process of checking where the problem lies
Your assistance will be highly appreciated
Kind regards
Johan Louw ( Logged in as zsjad )
Member
Joined: Feb 2018
Posts: 127
Likes: 7
1994 e320 coupe
May have nothing to do w/AC.
I don't have those type of controls (auto type), but are you saying whether the AC button is on or off, heat is coming out of the vents as if the dials were set to the HOT position?
I don't have those type of controls (auto type), but are you saying whether the AC button is on or off, heat is coming out of the vents as if the dials were set to the HOT position?
Thread Starter
Newbie
Joined: Feb 2009
Posts: 10
Likes: 0
1998 e250d w124
Sorry guys for the long delay, but yes, I confirm that hot air is entering the cabin with the thumbwheels in the cold position
To my mind it means that the hot water is never cut off from flowing to the heater core under the dash or wiper motor. I believe it is supposed to be done by the valve mentioned in my first post. I can't however not work out how this valve works. When I put 12 volts on the valve its electrical motor spins
Any advice out there will be appreciated
To my mind it means that the hot water is never cut off from flowing to the heater core under the dash or wiper motor. I believe it is supposed to be done by the valve mentioned in my first post. I can't however not work out how this valve works. When I put 12 volts on the valve its electrical motor spins
Any advice out there will be appreciated
MBWorld Fanatic!
Joined: Nov 2002
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From: Massachusetts
2018 GLE350, 2014 G550, 2000 SL500, 1980 TR8, 1995 E320 Cabriolet
Sorry guys for the long delay, but yes, I confirm that hot air is entering the cabin with the thumbwheels in the cold position
To my mind it means that the hot water is never cut off from flowing to the heater core under the dash or wiper motor. I believe it is supposed to be done by the valve mentioned in my first post. I can't however not work out how this valve works. When I put 12 volts on the valve its electrical motor spins
Any advice out there will be appreciated
To my mind it means that the hot water is never cut off from flowing to the heater core under the dash or wiper motor. I believe it is supposed to be done by the valve mentioned in my first post. I can't however not work out how this valve works. When I put 12 volts on the valve its electrical motor spins
Any advice out there will be appreciated
Thread Starter
Newbie
Joined: Feb 2009
Posts: 10
Likes: 0
1998 e250d w124
Thanks Floobydust. Your reply is the exact start to my enquiry that I was hoping for and I think you have got it exactly right. Is there anything one can do to repair such a valve? I believe they are scarce and costly
Kind regards
Kind regards
