Bmw E34 Heater Valve Diagnosis

Bmw home bmw 5 series e34 1989 1996 ventilation a c heater system.

Bmw e34 heater valve diagnosis.

In this video i go over what was wrong and show how i fixed it. Brand rating 10 75 hvac heater hose. Bmw e34 and e32 have a funny tendency to loose the heat in the middle of winter. 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.

My relatively new heater valve stopped working. 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 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. The default position of the valve is to be full open. 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. If this happens to you time to check the heater valve.