Chrysler Full-Size Vans 1989-1998 Repair Guide

Heater Water Control Valve



See Figure 1

  1. Disconnect the negative battery cable.
  3. Drain the cooling system so that the level (of the system) is below the control valve.

Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Loosen the heater hose clamps and remove the hoses.
  3. Disconnect the vacuum line to the valve vacuum control.
  5. Remove the mounting screws and remove the valve.
  7. On models with an auxiliary heater, the water control valve is ""teed'' from the main control valve. The removal and installation procedure is the same except for more hose clamps to loosen and an extra vacuum line to remove and connect.
  9. Place the control in position and secure it. Connect the heater hoses (replace any hoses that show wear) and secure the hose clamps. Connect the vacuum line(s).
  11. Fill the cooling system and check the control valve operation.

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Fig. Fig. 1: The heater water control valve; note the vacuum line and the two heater hose connections