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Old 07-25-2001, 12:00 AM
Join Date: Jan 2000
Location: Indpls.,IN. USA
Posts: 84
I've been working on a 1997 E 420 that has different temperatures from the left and right vents. The outside temp. gauge reads properly and the duo-valve,refrigerent charge and vaccum systems all seem to be working normally. No matter where the temp. is set the left side blows warm, not hot air. I seem to remember reading a similar post a while back but I couldn't find it with a search. Has anyone run into a similar problem.
Thanks for your help.
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Old 07-25-2001, 12:15 AM
Senior Member
Join Date: Apr 2001
Location: Beech Island, S.C.
Posts: 468
I've encountered the same problem with a 140 chassis car and it turned out to be the vacuum switchover valve. Steve Brotherman gave me the post for this problem if I remember correctly.
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Old 07-25-2001, 03:33 PM
David C Klasse's Avatar
CheFrac is Back!
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Something to do with a vacuum leak. Check out these two posts on the subject.

AC Vents... Center vs Side Vents

1991 190e 2.6, ac air cold on center vent, hot on side vents

2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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