When slowing down or at a stop,it blows cool air.
Mercedes-Benz Q&AAsk Your Question
1999 Mercedes-Benz CLK430 Question: Heater is set on high, heat do not get hot anymore(Warm air)
Answer #1G. T. Service Center (2294 Answers) , Stephenville, TX - (254) 638-3236ProfessorG January 24, 2014, 05:41Master
Check coolant level, is temp at running temp aprox 180 - 200deg. Water pump would be last option.
Answer #2Greg's Orange Auto (11856 Answers) , Orange, CA - (714) 361-9386globalhelper January 24, 2014, 06:25Master
poss thermostat or coolant level
Answer #3Dr Quick January 24, 2014, 17:00Enthusiast
When engine is cold, and if you have a expansion tank system, check water at radiator cap. My guess is low coolant too. Could be if you have a bad cap or something is loose on line to expansion tank, coolant will not return to radiator. Also look for a small leak if radiator level is down.