The left vent is blowing very hot air while the rest of the car's ac is working fine. Would anyone know which vaccum module on the ac/heater core unit needs to be replaced? I need help soon, please!!

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)

First things to check are your freon level and your duovalve. Both are common culprits for this -- run a quick search and you'll find my recent posts (and other more helpful posts) on exactly the same problem.

I took my duovalve apart and found all to be well. I then added a little freon and the problem was resolved. Pays to try a few other things before you go in for major repairs!

Cheers, John

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'98 E300TD (W210) | Sold 6/09 with 205k and counting
'04 VW Touareg V10TDI

Strange W210 AC behavior

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1967 250 S
1967 280SE
1968 250S
1971 280 SE
1973 220
1974 280 S
1975 450 SEL
1976 220 D
1979 300SD
1983 300 SD
1985 230 TE euro
1986 280SL
1986 500 SEL euro
1986 190E 2.3
1990 300 SE
2003 C230 K
2004 C230 K
1987 560SEL
1987 300SDL now in canada
2005 C230
1998 C43 AMG Sold to DON
1993 190E 2.6
300TD Former daily driver Totaled
current:
R320 CDI
Ram 2500 Cummins