Hello,

On my 1999 e300 when I had the climate control on today the left dash vent blew very hot air. While all other vents blew cold A/C air. No matter what I did I could not correct it. This has happened before and today, like then, it cleared itself up. Does anyone have an idea what is happening here? Thanks.

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1982 300d Turbo Diesel (Sat in P/O's Garage for 10 years) Purrs Like a Kitten

1999 E300 Turbo Diesel

1998 SLK 230

That sounds like it might be a Duo Valve problem.

Located next to the computer box on the right side of engine compartment.

Sometimes a good rap with a screwdriver handle will "fix" it. Kartek did a nice write up dissecting his and repairing it.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

BRILLIANT!!!!! That fixed it!!
Thanks.

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1982 300d Turbo Diesel (Sat in P/O's Garage for 10 years) Purrs Like a Kitten

1999 E300 Turbo Diesel

1998 SLK 230

I need more screwdrivers in my toolbox! Glad that worked for you.

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1982 300SD