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1999 Mercedes-Benz CLK430 Question: Heater is set on high, heat do not get hot anymore(Warm air)



PMCam, Upper Marlboro, MD, January 24, 2014, 08:21

When slowing down or at a stop,it blows cool air.

3 Answers
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  • Answer #1

    G. T. Service Center (4243 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG January 24, 2014, 08:41

    Check coolant level, is temp at running temp aprox 180 - 200deg. Water pump would be last option.

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  • Answer #2

    Greg's Orange Auto (14968 Answers) , Orange, CA - (714) 361-9386
    globalhelper January 24, 2014, 09:25

    poss thermostat or coolant level

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  • Answer #3

    January 24, 2014, 20:00

    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.

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