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The heater in my s420 mercedes blows only cold air.

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On the drivers side next to the brake booster there will be a valve with 2 ends going in the car and one though the fire wall remove the 3 clamps st connection and put a new heater valve

Posted on Dec 10, 2014

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It is advised to chk out the heater core because it consists of fins(heat exchanger) by an expert

Posted on Dec 08, 2014

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Posted on Jan 02, 2017

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SOURCE: 1997 audi A4 heater blowing cold air

You will have to change the heater core. 9 out of 10 times, when the heater is not heating the air, it is a bad heater core.

Posted on Nov 13, 2008

dr_layinlow
  • 60 Answers

SOURCE: 2001 malibu-heater is blowing cold air

sounds like you have a bad temperature sensor in dash or the cable has eitehr broken or come off the heater switch under the dash!!

Posted on Dec 07, 2008

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SOURCE: heater blowing cold air

squeeze the hoses to get any air bubbles out and refill coolant as necesary. are you sure you put thermostat in the right way? may be backwards. also may be your sensor.

Posted on Jan 04, 2009

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SOURCE: heater only blows out cold air

Check the valve that controls coolant flow to the cabin

Posted on Feb 12, 2009

  • 7 Answers

SOURCE: when i have the heater/defroster on the heater

It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.

Posted on Sep 05, 2009

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1 Answer

I have no heat. I only get cold air. Any suggestions?


check that the heater controls are turning on the coolant tap for the heater core
check the heater core is not blocked

Jan 14, 2016 | 2006 Mercedes-Benz Mercedes Benz CLS500

1 Answer

The heater is only blowing hot air


Sounds as if the blend door is stuck open.

Mar 23, 2014 | 1993 Mercedes-Benz 220

1 Answer

The heater in my 2002 Mercedes ML500 only blows cold air (air temperature) and the AC as well. The middle vent is not blowing at all.


As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----


------------

Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------


No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

------------

These will help.

Thanks.

Feb 15, 2013 | Mercedes-Benz ML320 Cars & Trucks

1 Answer

Heater does not work


Heater blows air temperature air, not heated air. Has worked sporadically for short periods, but most of the time just blows cold air.

Nov 16, 2010 | 1999 Mercedes-Benz M-Class

1 Answer

The heaters only blow cold air no warm air in my mercedes 320cdi is it a quick fix


The problem possibly faulty heating water circulation pump, must diagnose to find the fault, it can stop by many deference control system in your particular car,

Nov 13, 2010 | 2003 Mercedes-Benz S-Class

1 Answer

E180auto passengerside aircon always blowing cold 1992 model


Sounds like the vent control motor is bad. It controls how much hot water flows through the heater core. OR the heater core for that side is clogged

Feb 03, 2010 | 1991 Mercedes-Benz E-Class

2 Answers

Car heater blowing cold air and leakage behind the dashboard


IT'S THE HEATER CORE, IT IS LOCATED UNDER THE RAIN GUARD THINGY UNDER THE WIPER MOTOR

Nov 18, 2008 | 1991 Mercedes-Benz 190

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