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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
associates in automotive technology
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I'm having a heat issue with my 87 w124 300d. I only get
Hi, I'm having a heat issue with my 87 w124 300d. I only get cold air from the vents. when i use econ setting i get outside air temp air, but on any other setting i get cold air. I took the conical br… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
No hot air blowing when heater is on. Replaced the water
Replaced the water pump and thermostat. No more leaking … read more
Lou Palomino
Lou Palomino
associates in automotive technology
9,884 satisfied customers
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
57,140 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
Mercedes S500 2003 Interior heat not coming up. Have had
Mercedes S500 2003 Interior heat not coming up. Have had heater core boiled out. Sluggish air flow but air flow is not warm. Currently below zero outside, but this has been a problem for some time. If… 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
e320: Hey Marty, Ive been thinking about the restriction
Hey Marty, I've been thinking about the restriction in the heater core of the Benz, Last year when I did the AC I removed the heater hoses around the Hblock to get at it. There is a plastic Y connecto… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
C230 Kompressor: 2005 C230 Kompressor Sedan. The interior
2005 C230 Kompressor Sedan. The interior heat is not hot enough. It does get warm, but if the fan is on high, it gets cold. I have changed the aux water pump with a new unit, but it did not seem to ch… read more
Marty
Marty
Mercedes Technician
Associate Degree
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107: My 1981 Mercedes 380 SL... The heater stopped blowing
My 1981 Mercedes 380 SL... The heater stopped blowing hot air. The control panel opens the various settings and the fan. Everything appeared normal but no hot air... The circulating pump under the hoo… read more
Bryan
Bryan
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1997 mercedes E320: cools..engine running but car..A/C blows hot air
My 1997 mercedes E320 A/C cools/blows just fine, BUT every 45 seconds or so it simply stops blowing, then starts up again, then stops, etc. Live in Phoenix, so it is very hot. also, when engine runnin… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
2005 mercedes: Cab..passenger side..It works fine on the driver side.
My 2005 Mercedes CLK 320 Cab has a heating issue. It doesn't blow hot air on the passenger side. It works fine on the driver side. A/C works fine on both sides. Any idea what is wrong and how to fix? … read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
Ac and heat replaced and now my passenger vent blows out hot air
Had my fan for ac and heat replaced and now my passenger vent blows out hot air when in the ac mode. Have been told by the dealer that I might need a dvo valve. Could the fan been put in incorrectly t… read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
1993 mercedes benz 190e 2.3: doesnt work..cold air..blower motor
I have a 1993 mercedes benz 190e 2.3 and the heat and air doesnt work it blows very lightly and it is always cold air I was told the blower motor is out and this makes sense because it blows so lightl… read more
Cory
Cory
LICENSED CHARTER CAPTAIN
High School or GED
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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
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
S500: mb..system blows but only cold air comes out.
I have a 1998 MB S500. I am having heating. the system blows but only cold air comes out. I have check Mono valve fueses, relays and thermostat and the problem is not their. Can you tell me where the … read more
Marty
Marty
Mercedes Technician
Associate Degree
57,140 satisfied customers
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
57,140 satisfied customers
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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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