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Blowing cold air. no voltage to duo valves. All is fine.
removed and cleaned all parts in duo valve. as I sail, there is no voltage going to the duo valve with heat up enging warm and running … read more
Lou Palomino
Lou Palomino
associates in automotive technology
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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
57,141 satisfied customers
I turn the a/c on ,and cold air is coming from the middle,
I turn the a/c on ,and cold air is coming from the middle, and really hot from the sides. How can I find the problem… read more
Marty
Marty
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Associate Degree
57,141 satisfied customers
My c280 1998 AC is blowing cold on left side and hot on
my c280 1998 AC is blowing cold on left side and hot on right side at same rime center is not blowing at all… read more
Billy
Billy
Bachelor's degree
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Mercedes-Benz 420SEL: I have a 1991 mb 420sel both hot air
I have a 1991 mb 420sel both hot air and cold air comes out when ac on can you help me with this thanks mike… read more
Marty
Marty
Mercedes Technician
Associate Degree
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mercedes 300 se: 1991 mercedes benz 300se heater/ air in the
1991 mercedes benz 300se heater/ air in the winter blew cold air now its not blowing any air for air or heat we purchased a climate control and blower regulator register replace motor and relay fuses … read more
Marty
Marty
Mercedes Technician
Associate Degree
57,141 satisfied customers
Mercedes-Benz 300 SE: HI. I have a 1993 Mercedes 300se that
HI. I have a 1993 Mercedes 300se that I just got back from the dealers with an air conditioning repair. It has been running great for the past few days at the lowest setting on auto, but today, with t… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,141 satisfied customers
1990 mercedes: (diesel..heater..push..middle vent pushes out cold air
I have a 300D 1990 mercedes (diesel) which when the heater is on, the outside vents push heat out but the middle vent pushes out cold air! is this normal and do you just shut the middle vents off. (Ho… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,141 satisfied customers
300D: diesel..car comes to an idle it runs rough and vibrates..park
we have a 300D diesel mercedes 1990 where when the car comes to an idle it runs rough and vibrates. you can normally stop this by putting the car into park and then into drive. it does not do it all t… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,141 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
57,141 satisfied customers
e320: car has dual climate control the double vent..blows cold..thermo
hello again i have a2002 e320 the a/c is my problem the car has dual climate control the double vent in the middle of the dash one on right blows cold and the one on the left blows luke warm even thou… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,141 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
57,141 satisfied customers
Mercedes 190D: hot air being pumped..ripped..cluster
Hello tech 8753. I am back again with the existing problem of hot air being pumped through side vents on my mercedes 190D 2.5. I ripped open the central consol and dismantle thr control knob cluster. … read more
Marty
Marty
Mercedes Technician
Associate Degree
57,141 satisfied customers
1993 300E: blows cold air..switches..the center of the console
1993 300E - air conditioner blows cold air for 30 or 40 minutes then switches to blowing hot air from everywhere but the center of the console. Nobody seems to have an answer. John Fallows… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,141 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
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The side vents when the AC is on and cold air comes..whats
my 1995 e 320 conv. blows warm (hot) air out the side vents when the AC is on and cold air comes out the middle vents. whats up with this Please???… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,141 satisfied customers
The A/C blows cold out the passengers side vents..driver side
I have a 1997 E300D. The A/C blows cold out the passenger's side vents, but not the driver';s side vents. Even the center 2 vents, driver side is warm, pass is cold. Help?… read more
MB Paul
MB Paul
Mercedes Technician
Vocational, Technical or Trade Scho
3,567 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
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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

57,141 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,132 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

771 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.

Tim Mohr

Tim Mohr

ASE MASTER TECH

283 satisfied customers

30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL

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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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