Bmw E34 Heater Valve Diagnosis

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Bmw e34 heater valve diagnosis.

This is an easy task you need to remove the 4 bolts on top of the heater valve disconnect the wires and then pull the valve out. My relatively new heater valve stopped working. The default position of the valve is to be full open. Bmw e34 and e32 have a funny tendency to loose the heat in the middle of winter.

If i isolate the heater valve electrical supply on the valves themselves and feed 12v direct from another source then they switch off ok and the heater core goes cold. If the heat will not turn off you likely have either a faulty heater control valve opens and closes the flow of hot engine coolant through the heater core or climate control panel output to the heater valve. Brand rating 10 75 hvac heater hose. If this doesn t work change the heater valve and the auxiliary pump.

Has spent hours hooked up to the bmw diagnostic system at my dealer and they cannot find the faults. Heater system page 2. In this video i go over what was wrong and show how i fixed it. Heater valve to left side of heater pipe 525i wagon 1992 95 heater valve to left side of heater pipe 535i sedan 1989 93 middle heater core.