Heater not hot
01-04-2016, 09:27 PM
#1
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Heater not hot
I noticed recently that the heater of my car (2004 CLK320) is not hot enough. The air is warm but not hot enough, Is there anything I can check?
Water pump, thermostat and coolant were replaced 4 years ago.
Water pump, thermostat and coolant were replaced 4 years ago.
Last edited by mis3; 01-04-2016 at 09:45 PM.
11-27-2016, 04:19 AM
#2
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04 CLK500 & 10 GLK350 (Past: 83 380SL, 03 C230 Coupe, 2013 C250 Sedan, 97 C280)
Same problem with my 2004 CLK500. Warming when it's cold out, but seems to be a mix of warm and cool air... Ever figure out what it was?
12-10-2018, 03:40 PM
#4
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Hmmm. Do you hear any clicks upon starting the car? I ask because I had this issue. No heat or A/C. It ended up being the flaps that control what vents the heat and ac flow out of. My 2004 CLK 320 had this issue.
12-10-2018, 05:18 PM
#5
MBworld Guru
Try the ACC test/resync: With the engine running, simultaneously press and hold the RECIRC and FRONT DEFOG buttons until their lights begin to flash. The lights will flash for about 20-30 seconds as it tests the dampers. If it strops, all is good and the problem is likely engine cooling related (i.e. thermostat). If they do not stopm, then shut off the engine to end the test and use a proper scan tool to pull codes from the ACC to see what is wrong.
