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

We have had this same problem with this car a couple of years ago, I cannot remember what caused it, any input appreciated

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.

You have a vacuum leak on one of the vacuum lines or the reservoir.

Or, I have seen the blend air flap potentiometer fail and cause this. I have had success cleaning it with contact cleaner and a readjustment.

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS

I think that was the problem the last time, a vacuum leak. How do you find these? The soap and water trick does not sound appropriate for vacuum lines..

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.

I have the same problem,I thought that was normal.

Ron
93 190e 2.6

Sometimes my air works ok. But if I really jump on the car I will immediately get hot air out of the side vents. I suspect a vaccum leak. But I performed all the tests in the Mercedes manual and the problem has not been located.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T

Numerous occasions the problem occurred. The most common "for my experience" the vacuum motor behind the instrument cluster was defective. Fortunately this is the easiest one to test but not always the problem. That's what I would check first.

Now,
How do you check all of that??

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
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!)