Heater Supply/Return Tubes
HEATER SUPPLY/RETURN TUBESREMOVAL
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.
4. Remove hose clamp from heater return tube located near starter. Disconnect hose from tube (Fig. 11).
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. 11).
13. Remove heater tube assembly.
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.
INSTALLATION
1. Inspect all hoses that connect to heater tubes. Replace if necessary.
2. Position heater tube assembly near it's mounting location.
3. Connect hoses at water pump inlet tube and thermostat housing. Ensure clamps are positioned properly to seal hoses and avoid contact with engine components.
4. Install fasteners attaching heater tube assembly to cylinder head and engine block (Fig. 11).
NOTE: Before installing transmission dipstick tube clean any residual coolant from around the area where plug was placed.
5. Remove plug from transmission dipstick tube mounting hole. Install transmission dipstick tube.
6. Reattach wiring harness to heater tube assembly.
7. Connect two heater hoses to heater tubes near battery. Ensure clamps are positioned properly to seal hoses and avoid contact with engine components.
8. Connect PCV vacuum hose to intake manifold.
9. Install air cleaner housing and throttle body to intake manifold hose.
10. Raise vehicle on hoist.
11. Close radiator draincock.
12. Lower vehicle
13. Install battery. Connect positive battery cable. Connect negative battery cable.
14. Fill cooling system.