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Heater Supply/Return Tubes: Removal

NOTE: It is not necessary to remove the intake manifold to replace heater supply/return tubes.
  1. Disconnect negative battery cable. Disconnect positive battery cable. Remove battery.
  2. Raise vehicle on hoist.
  3. Drain cooling system. Refer to STANDARD PROCEDURE .
  4. Remove hose clamp from heater return tube located near starter. Disconnect hose from tube. (Fig 1).
    Fig 1: Removing/Installing Heater Supply/Return Tube Assembly
    G01032607Courtesy of DAIMLERCHRYSLER CORP.
  5. Lower vehicle
  6. Remove air cleaner housing and throttle body to intake manifold hose.
  7. Disconnect PCV vacuum hose at intake manifold.
  8. Remove hose clamp from heater supply tube located near thermostat housing. Disconnect hose from tube.
  9. Remove two heater hose clamps and disconnect heater hoses near battery.
  10. Unclip wiring harness from heater tube assembly.
  11. Remove transmission dipstick tube and place an appropriate plug into hole to prevent coolant from entering transmission.
  12. Remove fasteners attaching heater tube assembly to cylinder head and engine block. (Fig 1).
    13. NOTE: After heater tube assembly is removed, the short hoses connecting the tubes to the thermostat housing and water pump inlet tube can be replaced at this time.
  13. Remove heater tube assembly.
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