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Lou, We have a 1997 Mercedes S320, W140 series, VIN
Hi Lou, We have a 1997 Mercedes S320, W140 series, VIN ***************** with poor interior heat. We have replaced the water pump and thermostat recently, and the aux. water pump with the dual mono va… read more
Lou Palomino
Lou Palomino
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associates in automotive technology
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Having issues with my 1986 560 sl not blowing hot air all
Having issues with my 1986 560 sl not blowing hot air all the time … read more
Matt
Matt
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Bachelor's Degree
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Heater headache, 1984 300D. Fan blower always works.
Heater headache, 1984 300D. Fan blower always works. Intermittently just cold/cool air coming out.Sometimes gets worse, but the intermittency doesn't relate to the engine temp, RPM, idle, road velocit… read more
Lou Palomino
Lou Palomino
Mercedes Technician
associates in automotive technology
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I have an 82 Mercedes 380sl. I have replaced my mono valve
I have an 82 Mercedes 380sl. I have replaced my mono valve and my push button ac and heat unit but I'm still having heating issues. The thermostat was replaced too. The tube to the cabin temp sensor i… read more
Marty
Marty
Mercedes Technician
Associate Degree
30,558 satisfied customers
Heats blowing out of defroster and side vents,while cold is
hello, heats blowing out of defroster and side vents,while cold is comingfrom center vents, compressor working ,replaced blower motor ,monovalve,vacuum tree under dash on 91 300e,ac still working inte… read more
Marty
Marty
Mercedes Technician
Associate Degree
30,558 satisfied customers
I'm having issues with my 1989 Mercedes 420 SEL heater. Do
I'm having issues with my 1989 Mercedes 420 SEL heater. Do you have someone that is knowledgable?… read more
Marty
Marty
Mercedes Technician
Associate Degree
30,558 satisfied customers
300e: I have a 90 300e 2.6 having a similar issue to the one
I have a 90 300e 2.6 having a similar issue to the one described here on this post : http://www.justanswer.com/mercedes/86iu9-e300-2-6-91-300e-2-6-w124-hot-air-blows.html blows hot air at defrost vent… read more
Marty
Marty
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Associate Degree
30,558 satisfied customers
Mercedes Benz 300DT: I have a 1985 123 Body style, 300 DT Mercedes
I have a 1985 123 Body style, 300 DT Mercedes Sedan that I am experiencing Heater problems with . With engine running and car setting the heater seems to work ok . Climate Control is on Econ button in… read more
Marty
Marty
Mercedes Technician
Associate Degree
30,558 satisfied customers
300 SD: Hi Marty. I have also 1982 300 SD. When I start it
Hi Marty. I have also 1982 300 SD. When I start it and push the button for windshield defrost, it blows, BUT after few minutes switches to side vents. Also heat ( temperature) goes down. Is there any … read more
Marty
Marty
Mercedes Technician
Associate Degree
30,558 satisfied customers
my ac..cold air at the vents but the fan wont work..control unit
My AC is working I can feel the cold air at the vents but the fan won't work. Also on a side note when the fans did work I couldn't get the heater to work. Is it the cabin air sensor that is the probl… read more
Marty
Marty
Mercedes Technician
Associate Degree
30,558 satisfied customers
1988 mercedes 420SEl: blower motor..High speed..heater core hoses
1988 mercedes 420SEl, I am trying to figure out why the defroster is not blowing hot air. The blower motor is working at High speed. The heater core hoses are hot on both sinput and output. Would like… read more
Marty
Marty
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Associate Degree
30,558 satisfied customers
94 s320: 3 vents blow hot air one blows cold..air works
94 s320 my blowers r acting up starts two blow hard then low in all but one vent . 3 vents blow hot air one blows cold. Can u explain to me how this air works ? I know I hav a dual system left and rig… read more
Stan
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The highway at high RPMs (70 - 80 mph) the vents..windshield
I have a problem with both of my 420 SEL's which just started when the warm weather set in a few days ago. While driving on the highway at high RPM's (70 - 80 mph) the vents in the front (predominantl… read more
Marty
Marty
Mercedes Technician
Associate Degree
30,558 satisfied customers
1991 350sd: there is HOT air coming out of somewhere..stick and mine
Hi, I have a 1991 350sd--the a/c works just fine but suddenly, there is HOT air coming out of somewhere in the driver foot area! Someone said there are louvers that stick and mine is open--any ideas o… read more
Marty
Marty
Mercedes Technician
Associate Degree
30,558 satisfied customers
1999 clk430: cold start hot interior blow high then med..temp sensor
1999 clk 430 a/c high speed blower max not working. cold start hot interior blow high then med then high on deceleration then med, on cold start with a cool interior it works a longer time at max or a… read more
nelson garcia
nelson garcia
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94 S420: Benz..nice cold air in the summer..hot air..windshield
I have a 94 S420 Benz. When I use the A/C, it works fine and blows nice cold air in the summer. Now I'm trying to use the Heat for the winter but the hot air is blowing really soft and will only blow … read more
Marty
Marty
Mercedes Technician
Associate Degree
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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
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Vocational, Technical or Trade School
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mercedes s320: climate control panel electrics..fan speed..vents
i have a mercedes s320 w140 1997, the climate control panel electrics seem to be working fine but no matter how high i set the temp and fan speed, no air seems to coming through the vents at all, this… read more
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Meet the Experts:

MB Paul

MB Paul

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3,567 satisfied customers

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

Marty

Marty

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Bosch Certified Master Tech. Over 35 years experience.

Michael Warfield

Michael Warfield

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Matt

Matt

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

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promerc

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Hipo64

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30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL

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