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    R129 Central locking and heater problem

    Managed to sort the problem by replacing the heater control unit.
  2. B

    R129 Central locking and heater problem

    New member. First post. 300Sl 24 (1991) project car. Central locking pump broken beyond repair. Also heater control not working (pumps out hot air from side vents/aux fan not working/duo valve solenoids click ok when 12V applied). I have been trying to find out if the flaps in the engine...
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