Rear Heater Hose Replacement

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

1. Partially drain engine cooling system. Service and Repair

Fig.10 Front Lines Connected To Rear Lines:

2. Loosen clamp at the front end of the hose located at the right, outboard side of the underbody, rearward of the front crossmember.
3. Carefully rotate hose back and forth while tugging slightly away from connector nipple. If the hose will not come OFF, slice the hose at the connector nipple and peel off heater hose. This method will require heater hose replacement.

CAUTION: When removing hoses from outlet nipples, do not use excessive force. Outlet nipples may become damaged and leak engine coolant.

Fig.12 Rear Heater Hose Quick Connects:

4. Compress insert in rear heater hose quick connection and pull downward on hose.

Fig.9 Rear Heater And A/C Lines:

5. Remove (3) straps securing underbody lines.
6. Separate and remove rear heater lines from vehicle.

INSTALLATION

Fig.24 Heater Return W/o Oil Cooler:

Fig.25 Heater Return - W/Oil Cooler:

Fig.22 Heater Plumbing - W/o Rear Heater:

Fig.23 Heater Plumbing - W/Rear Heater:

There are several heater core plumbing configurations used on this model, depending upon the engine size and other optional equipment. These engines have unique heater return plumbing on the engine for models with or without an optional engine oil cooler. There are also unique plumbing configurations at the heater core for models with or without the optional rear heater and air conditioner. All models use a combination of formed steel tubing and rubber hoses. In most cases, the rubber hose is secured to the steel tubing with a spring tension clamp.

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

1. Using spring tension clamp pliers, compress and slide the clamps that secure each end of the heater hose toward the center of the hose being installed. Release the clamp when it is near the center of the hose.
2. Grasp one end of the heater hose being installed firmly and carefully twist the hose back and forth while pushing it over from the barbed end of the nipple. Repeat this procedure at the opposite end of the hose being installed.
3. Using spring tension clamp pliers, compress and slide the clamps that secure each end of the heater hose over the tube or nipple. Release the clamp when it is over the tube or nipple.
4. Refill the engine cooling system. Service and Repair