I own a 1996 C280.
It have been a wonderful car with very little trouble.
This week I received the car back from my mechanic, who replaced the fuel filter, fuel pump and water pump. He disconneted the battery in the process
of making these repairs.
When I started the car my A/C worked, although, I was getting hot air from the driver vent while the others blew cold air.
I need to know if this is a vaccum line issue, a stuck vent gate, both or something else.
Also, whatever the reason, is it something I can repair myself or does my mechanic need to do this.
Thanks for your input and advice.
Steve Dale


1996 C280
2001 E430
1995 190E R.I.P.

Sounds like a vacuum issue, perhaps he accidentally disconnected a vacuum line during his repair. Get him to check it out, he should not charge you anything.

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If only 1 side is getting warm (hot) then the heater valve is the most likely issue.

You can try blocking off the water flow with water pump pliers.

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Retired Moderator

I checked the website's parts companies.
In the Fastlane site they had a ACC dual valve that looked like the electro-
magnetic valve I replaced a few years ago. I found it making a "thunking" noise with a small shudder. Is this the dual valve or is this item located under the covered compartment on the passenger side that looks to have 7 ports with lines connected?
Also, explain where the hearter valve is.
In addition, I noticed a whirring noise coming from the back right section of the car. I believe this houses the vaccum lines for locks, etc. What else could this be?
Thanks
Steve Dale