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Related Mercedes Questions
I have a 1985 Mercedes 380sl. I have no heat. I changed out
I have a 1985 Mercedes 380sl. I have no heat. I changed out the monovalve with no luck. I have heat if the car is in accessory for only a couple of minutes. I do not have heat when the car is running … read more
Lou Palomino
Lou Palomino
associates in automotive technology
10,035 satisfied customers
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
associates in automotive technology
10,035 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
57,140 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
57,140 satisfied customers
Continuing to have "no heat" problem in my 560SEL.
Continuing to have "no heat" problem in my 560SEL. I replaced the monovalve, didn't help. I have taken the assembly out to diagnose and I found that there is some sort of plastic valve in the bottom o… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
My name is ***** *****, I have been going through some pain
Customer: My name is ***** *****, I have been going through some pain with my 1985 300Sd heating No heat for the driver: Replaced teh following. Monovalve, water pump, aux water pump. disconected the … read more
sprinkles08
sprinkles08
Technician
High School or GED
19,838 satisfied customers
Marty, The heater on my 560SEL was blowing cold. I checked
Hello Marty, The heater on my 560SEL was blowing cold. I checked the monovalve and sure enough it was torn (see attached picture). I replaced it, but the heater still blows cold. Is there a correct po… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
I have an 87 560sl I replaced the mono valve and now at idle
I have an 87 560sl I replaced the mono valve and now at idle with monovalve unplugged I will have hot air but while driving the air cools off to barely warm. I know my temp wheel is not working right … read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
280SL: Have '83 280SL with heater that works fine at idle and
Have '83 280SL with heater that works fine at idle and slow speeds, goes cold on highway. Rebuilt monovalve - didn't help. Any ideas? It's cold here.… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
mercedes 560sl: 1987 mercedes 560sl, heat was intermittant,
1987 mercedes 560sl, heat was intermittant, only blowing warm on defrost. replaced monovalve. Now only blowing cold air. Found A/c compressor cycling even when dialed to heat. Now only blowing extreme… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
C240 4matic: question for eurotec only C240 4matic, 2004 while
question for eurotec only C240 4matic, 2004 while driving home in extreme cold, heater was working fine. all of a sudden, starts blowing cold what is the likely cause?… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
89 560sel: nothing but cold air from my heater now..somtimes..shutting
i have an 89 560sel. i get nothing but cold air from my heater now. I can stop the engine and open my door and somtimes hear a door shutting and then the heater works. some vacuum actuated door is not… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 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
57,140 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
57,140 satisfied customers
560sec: my heater..demisting but doenst blow much heat into the rest
my heater doenst seem to be working properly anymore.. it works on heat for demisting but doenst blow much heat into the rest of the cabin.. 560sec 1987… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
vent..fan is off and the fan is not blowing temp-setting is set..flow
Defroster will not turn off. Hot air is coming out of the defroster vent, defroster is in the off setting and the fan is off and the fan is not blowing temp-setting is set to cold . But hot air is sti… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
2000 SL 500 and the ac has good freon..fan blows..heater works
I have a 2000 SL 500 and the ac has good freon but still doesn't get reall cold.I set the temp on different settings and I get the same air temp.It doesn't help to put on the recirculating mode.The fa… read more
tech4benz
tech4benz
Master Certified Mercedes Technician
Associate Degree
196 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

57,140 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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