Heater Hose: Service and Repair

UNDERBODY HEATER TUBES

REMOVAL

WARNING: REFER TO THE APPLICABLE WARNINGS AND CAUTIONS FOR THIS SYSTEM BEFORE PERFORMING THE FOLLOWING OPERATION.

1. Drain the engine cooling system.
2. Raise and support vehicle.

Underbody Heater Tube Quick Connect Fittings:

3. Disconnect the underbody heater tubes at the rear of the vehicle by releasing the insert in the rear underbody heater tube quick connect fittings and carefully pulling downward on the inlet and return tubes.

Underbody Connections:

4. Remove the three retaining straps that secure the rear heater underbody tubes to the vehicle under-body.
5. Lower the rear of the underbody heater tubes and drain any residual coolant from the tubes into a suitable container.
6. Using spring tension clamp pliers, compress and slide the clamps off of the rubber hoses at the front of the underbody heater tubes.

CAUTION: DO NOT apply excessive pressure on heater tubes or connections when removing heater hoses. Excessive pressure may damage or deform the tubes, causing an engine coolant leak.

7. Disconnect the front underbody heater inlet and return hoses by carefully twisting the hoses back and forth on the underbody tubes, while gently pulling them away from the end of the tubes.
8. If necessary, carefully cut the hose ends and peel the hoses off of the tubes.

NOTE: Replacement of the heater hoses will be required if the hose ends are cut for removal.

9. Remove the underbody heater tubes from the vehicle.

INSTALLATION
1. Position the rear heater underbody tubes to the vehicle.

CAUTION: DO NOT apply excessive pressure on heater tubes or connections when removing heater hoses. Excessive pressure may damage or deform the tubes, causing an engine coolant leak.

2. Connect the front underbody heater inlet and return hose by carefully twisting the hoses back and forth on the underbody tubes, while gently pushing them onto the end of the tubes.
3. Using spring tension clamp pliers, compress and slide the clamps that secure each end of the heater hose over the tubes. Release the clamp when it is over the tube.
4. Install the three retaining straps that secure the rear heater underbody tubes to the vehicle under-body.
5. Connect the rear underbody heater tube quick connections to the rear heater core extension tubes.
6. Lower the vehicle.
7. Refill the engine cooling system.
8. Lower vehicle.
9. Fill cooling system.