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Check Coolant Light

lrh032146lrh032146 Member Posts: 2
edited February 2017 in Mercedes-Benz
2005 C230 Kompressor 155,000 miles
I get the "check coolant light", add a gallon of coolant, light goes off, within half tank of gas light comes back on...can see no leak on the ground under the car...where is this coolant going? Thanks
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    lrh032146lrh032146 Member Posts: 2
    where is coolant going?
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    ray80ray80 Member Posts: 1,655
    edited February 2017
    After adding coolant and running it a bit did you check to ensure it was completely full? . Any white smoke from exhaust (except when starting cold)?
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    Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    Coolant is either leaking or its burning. There's no other way to lose it.

    Given that, ray80 is on the right track here.

    First thing I'd do is have the cooling system properly "bled" to remove all the air.

    If that doesn't solve it, then have the cooling system pressurized and have it examined carefully for leaks under pressure.

    If that doesn't reveal anything, keep the system pressurized and then remove the spark plugs one by one. If any of them have coolant on their tips, then you have a bad head gasket---and given the age and mileage of the car, a big decision to make.

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