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Marty, Further diagnosis on the heater problem in my 91
Hi Marty, Further diagnosis on the heater problem in my 91 560SEL. When the system is "on" there is no heat, and air blows cold. When it is "off" warm air comes through the side vents and floor vents … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
sle 560: I own a 560 sel 1990 with 170,000 miles that has developed
I own a 560 sel 1990 with 170,000 miles that has developed a heater problem. The heater blower works fine, but the blower blows non heated air. But the strange thing is once the car is heated up, and … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
Mercedes-Benz 300D: after running for 1/2 hour or so my ac
after running for 1/2 hour or so my ac starts blowing hot air out of the outside upper ports as well as the port on your feet. you can let the car sit for an hour ormore and it will work ok again for … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
OUT the heater on the side vents blow VERY hot air..only happens
when I am in the car WITH OUT the heater on the side vents blow VERY hot air. Even if you touch the vent it is burning hot. This only happens on side vents. The car become unbearably hot. Mind you the… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1988 300se: heat is blowing out from the vents..windshield..hot air
I have a 1988 300se. the control panel for heater and airconditioning does not work and when the engine is on heat is blowing out from the vents at the bottom of the windshield. How can I prevent the … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
Mercedes-Benz 190E My 1993 190E air conditioner no longer
My 1993 190E air conditioner no longer blows out cold air. The problem has been slowly building over the past couple of years, but now, no cold air at all. Any suggestions?… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
94 S320: blowers..two vents blow cool air and two blow hot air
94 S320 when I turn on the blowers for the air/heating system two vents blow cool air and two blow hot air.… read more
mbfixer
mbfixer
Shop manager
High School or GED
453 satisfied customers
Mercedes: blows hot air..middel vents and cold air out the side vents
I have a 1994 E220, Mercedes. Once the car is up to running temprature the aircon blows hot air out the middel vents and cold air out the side vents and sometimes visa versa. This is with the aircon s… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
93 400sel: some vents and perfect cold air..blow hot air
my 93 400sel blows hot air out of some vents and perfect cold air out of the front middle and rear vents. What causes some vents to blow hot air when the A/C is on?… read more
mbfixer
mbfixer
Shop manager
High School or GED
453 satisfied customers
Kompressor: hot air on the drivers side..passenger side..blown..vents
Hello, I have a 2000 230 SLK Kompressor roadster and the I'm having problems with the dual A/C unit. With the A/C on it blow hot air on the driver's side and cool air on the passenger side. When I shu… read more
mbfixer
mbfixer
Shop manager
High School or GED
453 satisfied customers
Mercedes benze: my heat stop coming..fan blows..my heater core
I have a 1998 S500 Mercedes Benze and my heat stop coming out on one side,but the fan blows very strong,they checked to see that there was hot water going through the lines and they were ok.One person… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
Blowing hot air..i am driving the faster i go the hotter it gets
why is my 86 300 E blowing hot air in car when i am driving the faster i go the hotter it gets inside?… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1990 Mercedes Benz: My car will not blow heat on occasion, and when it
I have a 1990 Mercedes Benz 300E. My car will not blow heat on occasion, and when it does it's not when I expect it. What is the problem?… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
2004 Mercedes-Benz E500: Regarding fuses..vents..cold air..blown
Regarding fuses: On my 2004 Mercedes-Benz E500 the rear air conditional (A/C) vents blow hot, presumably engine air contrary to its LO setting, while the front works properly dissipating cold air. The… read more
MB Paul
MB Paul
Mercedes Technician
Vocational, Technical or Trade Scho
3,567 satisfied customers
99 E320: MY A/C BLOWS COLD AIR..HOT AIR..SIDE VENTS
I HAVE A 99 E320 DEISEL. MY A/C BLOWS COLD AIR ON THE TWO CENTER VENTS AND HOT AIR FROM THE TWO SIDE VENTS! WHAT IS MY PROBLEM?… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
wagon: mb..ac system..supposed to pick a temperature..ac was recharged
The AC on my 1984 MB 300TD wagon is acting weird. I have the 'climate control' version of AC system, where you are supposed to pick a temperature and leave it alone. The AC was recharged when I bought… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1985 mercedes: sl..heater..thermostat..car is driven, the air coming
my 1985 mercedes 380 sl has a heater problem, in that it won''t blow warm air regardless of the settings. I replaced the thermostat but no change. If you start it up and let it idle, it WILL blow warm… read more
RIP
RIP
Lead Technician/ JA Car Category Mentor
High School or GED
452 satisfied customers
1989 Mercedes: heater..blowing cold air..defroster..a relay or vaccum
I have a 1989 Mercedes 420 sel and when using the heater the floor vents keep you warm but the air coming out of the vents at the window is blowing cold air. If you put the defroster on the air will w… read more
MBGuru
MBGuru
Bachelor's Degree
282 satisfied customers
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Meet the Experts:

MB Paul

MB Paul

Mercedes Technician

3,567 satisfied customers

Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes

Marty

Marty

Mercedes Technician

29,460 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

6,435 satisfied customers

20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,132 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

643 satisfied customers

Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing

promerc

promerc

mercedes diagnostic technician

553 satisfied customers

Qualified mercedes diagnostic technician & service team manager , ATA registered Master tech

Hipo64

Hipo64

Mercedes Technician

444 satisfied customers

Work and diagnose electronics on daily basis.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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