BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

Heater Water Control Valve

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REMOVAL & INSTALLATION



E30 3 Series
  1. Disconnect the negative battery terminal. Remove the center console and the drivers side instrument panel trim next to the steering column. Drain the coolant.
  2.  
  3. Disconnect the coolant hoses from the inlet on the firewall. Disconnect the wire from the control valve.
  4.  
  5. Loosen the coolant pipe clamp. Remove the 2 bolts from the pipe connection at the control valve and the 3 bolts from the heater connection.
  6.  

To install:
  1. With power applied to the control valve, it will close. With power removed, it will be open. Replace the O-rings at the connections.
  2.  
  3. Replace the bolts in the connections and attach the pipe clamp. Connect the wire to the control valve.
  4.  
  5. Connect the coolant hose at the firewall. Install the center console and the instrument panel trim. Fill and bleed the cooling system. Connect the negative battery terminal.
  6.  

E36 3 Series
  1. Disconnect the electrical plug from the heater control valve located to the left of the hose connections on the firewall.
  2.  
  3. Drain the coolant and remove the hose connections from the valve. Note where the hoses are connected.
  4.  
  5. Pull the valve assembly from the bottom to disconnect it from the rubber mount. Lift the valve from the upper mount.
  6.  

To install:
  1. Place the upper portion of the valve into the mount and press the bottom part into the mount.
  2.  
  3. Connect the coolant hoses in the original locations sand connect the electrical plug. Fill and bleed the coolant system.
  4.  

E34 5 Series
  1. Drain the cooling system. Disconnect the heater hoses from the control valve and the feed hose to the electric water pump, if equipped.
  2.  
  3. Disconnect the electrical plug from the top of the valve. Remove the screws and the clamp.
  4.  
  5. Remove the valve by lifting out.
  6.  

To install:
  1. The valve can be checked by applying battery voltage to the top of the pyramid of terminals and alternately grounding the bottom pins. The valve will actuate.
  2.  
  3. Install the valve, bolts and electrical connector. Connect the coolant hoses. Fill and bleed the cooling system.
  4.  

 
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