Heater Inlet/Outlet & Heater Water Pump: Removal

1. Disconnect negative battery cable. See Fig 1.
2. Drain coolant.
3. Position approved coolant container under vehicle below heater hose connections to catch any coolant that may be trapped in heater hoses.
4. Open heater hose assembly to manifold clamp. See Fig 2.
NOTE: Green plastic rings may be found hanging on the pipes after hose removal; these are manufacturing aids and should be discarded.
Fig 1: Disconnecting Negative Battery Cable
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Fig 2: Removing Heater Hose To Manifold Clamp
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Fig 3: Removing Heater Core Inlet Hose Quick Connect Collar Tab
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Fig 4: Removing Inlet Hose From Heater Core
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5. Remove heater core inlet hose from heater core pipe by depressing quick connect collar tab, located at 6 o'clock, and pulling black collar towards front of vehicle and then pulling quick connect off heater core pipe. See Fig 3 and Fig 4 .
6. Remove heater core outlet hose from heater core pipe by depressing quick connect collar tab, located at 6 o'clock, and pulling white collar towards front of vehicle and then pulling quick connect off heater core pipe. See Fig 5.
7. Remove return hose to engine housing clamp and remove return hose. See Fig 6.
   Fig 5: Removing Outlet Hose From Heater Core

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   Fig 6: Removing Heater Outlet Hose From Engine Inlet

   Courtesy of GENERAL MOTORS CORP.
8. Remove heater core outlet hose to engine coolant inlet housing clamp and remove hose.
9. Remove heater inlet hose to coolant bridge clamp and remove hose. See Fig 7.
   Fig 7: Removing Heater Inlet Hose to Coolant Bridge

   Courtesy of GENERAL MOTORS CORP.
10. Disconnect electrical connector from heater water pump. See Fig 8.
11. Remove heater water pump mount and heat shield to bracket bolt and remove mount and heat shield. See Fig 9.
12. Remove inlet and outlet hose to heater water pump clamps and remove hoses. See Fig 10.

Fig 8: Removing Electrical Connector From Auxiliary Heater Water Pump

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Fig 9: Removing Auxiliary Heater Water Pump

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Fig 10: Removing Inlet & Outlet Hose From Auxiliary Heater Water Pump

Courtesy of GENERAL MOTORS CORP.