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Thread: No heat when cold

  1. #1
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,818

    Default No heat when cold

    Heat issue 95 530. When I start the car in the cold I get no heat (obviously til it warms up). When it does warm up I get no heat at all. It blows cold. Rev it up to get circulation and no heat. If I drive it I get heat. After I do get heat it will blow hot at an idle and not cool down so the aux pump works. Coolant level is full.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  2. #2
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,818

    Default

    Update: Pulled the heater valve from the parts car, looks to have been replaced with a new Bosch unit at one time. Pulled my current unit out, while in the process one plastic hose barb pulled out on the unit. While inspecting I noticed a crack down the side of the plastic housing. So... my old unit would drain coolant over night leaving an air cavity that would not fill until pressure and driving. New unit clicks and the pump works so I will see if it gets heat in the morning. I did not check the old unit at all.








    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  3. #3
    Join Date
    May 2004
    Location
    Japan
    Posts
    9,199

    Default

    Lucky that you noticed the crack early enough, one of my friends had also a crack in the plastic of the aux water pump (connection stud from aux pump to heater valves), most of the coolant lost, head gasket blown.
    Coolant circuit diagram M60 engine https://imgur.com/MV1c0xr
    Last edited by shogun; 01-26-2022 at 09:57 AM.

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