Question about 1991 Mercedes-Benz 560

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Vents blowing hot air while driving

I got an oil change on my 1992 Mercedes Benz 560 SEL and now the vents are blowing hot air when I drive.

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  • Anonymous Mar 18, 2014

    Mercedes Benz C180 -2002 model ac compressor not working blows hot air wen ac is on,ac fuse ok and gas level ok.what could be the issue?

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Hello I'm an M.B. tech, sorry I thought I sent this yesterday but it is not in my solution box. If your vehicle is actually blowing hot air and not just ambient ait through the vents the only reason this could be is that coolant is entering the heater core all the time. Mercedes had 2 ways of doing this from that era. The earlier version had a vacuum water valve against the rear firewall. The other version had an electric valve called a mono valve by the battery tray. I would think it would be very likley to knock of a vacuum line doing an oil change but most likley you would have other problems as well. The water valve had a red vac, line going to it. Your vehicle probably has the electrical valve which is ublikley to get damaged during an oil change. most likley the diaphram is ruptured. There are 4 slooted screws on top of the valve. If you remove those screws you will gain access to the insert(plunger for solonoid). Take the rubber seal and stretch it out. Take a close look for tiny tear in seal. It is a very common problem with the monovalve type system. You can replace just the insert and it saves alot of money as compared to the price of the monovalve. hope this is helpful.

Posted on May 23, 2009

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