Question about 2007 Mercedes-Benz ML320 CDI

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Heater problems My ML430 mercedes benz year 2000 is blowing cold air when I turn on the heater set the temperature control knob to red color. But my a/c is working properly. Coolant level is good. What seems to be the problem. I need help. Thank You Ed

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  • dhalcomb Apr 06, 2009

    03 ml 350 I have the same problem. I think it's the blend air stepper motor. I sure don't want to take my dash out. What a HUGE job that would be. I'm sure it would cost about 3K for the dealer to do the work. Please let me know if you figured yours out.

    Dave

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5 Suggested Answers

  • 1 Answer

SOURCE: 2003 Mercedes Benz E500

There is a valve that is located between engine and firewall. I fixed it myself with help from benzworld.org. It seems to be a common problem with this model and the new valve has a slightly different part number and is supposed to be better. It took about 1 hr. you have to take a few parts off to get to the valve, but if you can handle basic tools, it should be ok. there are great step by step pics on the benz site. part is about $40 at dealer. good luck!

Posted on Jan 25, 2009

  • 55 Answers

SOURCE: Engine temperature gauge reading on

It may be the thermostat

Posted on Dec 16, 2008

tengas55
  • 1 Answer

SOURCE: low to no heat coming out of front heater

check your thermostat and heater control switch

Posted on Jan 17, 2009

  • 1861 Answers

SOURCE: Heater/AC control no longer allows change in temperature

You have one of two possible problems.

1) The temperature shaft retention nut is loose behind the knob

2.) The wires to the potentiometer part of the temperature may be broken.

Either one is common to this vehicle. The replacement of the AC controller is about 900 dollars. If the wires are broken, they can easily be reattached to the circuit board via soldering. What you would have to do is remove the control box from the dash, and disassemble it. Once the unit is apart, there are 3 wires from the temp knob to the circuit board that need to be re-soldered. The unit CAN be repaired, as opposed to the expense of replacing it.

Posted on Apr 23, 2009

jasperoni
  • 203 Answers

SOURCE: My air conditioner won't blow cold air. It just blows air.

Hello I'm a M.B. tech. 1st you need to know why the freon is low. Hopefully it just needs to be serviced. There is a component located in the lf of the engine compartment called a receiver drier. It soaks up the moisture in the freon so the gases can work the way they are supposed to. On this unit there should be 2 switches(I believe they were combined into one switch in 98. 1 switch is a temp switch that operates your electric fans, the other is a compressor cutoff switch. Assuming the compressor is not coming on-take a fused wire and bridge the 2 contacts- If the compressor does not come on at all there is another problem(it is not low on freon. On the condenser there is a high side port(it is the bigger of the 2)By the brake master Cyl.(lf of the engine compartment thereshould be a smaller low side valve in line with the fuel cooler hose. Usually you can hook up a machine to the low port and **** freon in through that port. Assuming you do not have a refrigerant machine. It is very self explanatory on the bottle of r 134a refrigerant which can be purchased at your local auto supply store. I would start with 1 lbs. and add dye with the freon in case there is a big leak. If the system is overcharged it will not cool properly. I believe the system capacity is approx. 2 lbs. Add a few ounces after the first pound until a/c system is cooling properly and the electric fans are also coming on when the system gets to high. If you get a can with a good Gage set on it you should see the high side between 150 and 2000 psi(fan coming on at max. press.) also the low side should read about 35. It is about the temp of the evaporator which is i=located in the dash and the blower blows through this component out through the vents. Hopefully I have been helpful.

Posted on May 28, 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 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

-----------

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

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These will help.

Thanks.

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

1 Answer

My clk200 convertable is contantly showing a temperature of 70 degrees or above and the heater either blows red hot or stone cold with nothing in between. Can anyone tell me what the problem might be


I'VE OWNED SEVERAL MERCEDES BENZ CARS AND IMHO THEY ARE THE BEST CAR IN THE WORLD. DO YOU HAVE HVAC AKA AUTO CLIMATE CONTROL? IS SO SET THE TEMP A BIT LOWER. ONE FEATURE ON THIS SYSTEM IS IT HAS A MIND OF ITS OWN. THERE IS PROBABLY NOTHING WRONG, BUT ONE OF MY BENZ CARS WAS SO HOT I SET THE TEMP AT 65 DEGREES AND IT WAS COMFORTABLE. THERE IS A POSSIBILITY THE HEATER DOORS ARE NOT OPENING CORRECTLY OR THE CABIN FILTER HAS NOT BE CHANGED IN A WHILE.

Mar 03, 2011 | 2000 Mercedes-Benz CLK

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

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The passenger side only blows cold air, but the drivers side works correctly, what could cause this?


If the heater outlet air temperature cannot be
adjusted with the temperature control knob(s) on the
A/C Heater control panel, the following could require
service:
- The A/C heater control.
-The blend door actuator(s).
-The wire harness circuits for the A/C heater control
or the blend door actuator(s).
-The blend door(s).
- Improper engine coolant temperature

Jan 04, 2010 | 2000 Jeep Grand Cherokee

1 Answer

Car ac


i had same problem have ac recharged.

May 19, 2009 | 2000 Mercedes-Benz S-Class

1 Answer

Heater does not blow warm air


The click from He..., anyway hear is the problem, there is an electric motor that controls the door deep in the dash that sets the temperature of the outlet air, it is called a air temperature control blend door actuator, it has failed, in order to replace this part u must remove the dash assembly.

Apr 28, 2009 | 2003 Ford Explorer

1 Answer

Heater


is your temperature controller set to heat?

turn your knob all the way to the red line to energize the heater and disconnect the air conditioning.

also do not use the recycle mode since it would get the cold air from the outside.

tnx 4 using fixya,

drcool

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