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This DIY repair and service manual by Haynes, covers 1972-1983 Jeep Cherokee and Wagoneer, 1984-1991 Grand Wagoneer, and 1972-1988 J-Series pick-up trucks. Note: This manual does not include 1984 and later Comanche pick-ups.
Book Excerpt: 1972-1991 Jeep Wagoneer, Grand Wagoneer, Cherokee, J-Series Pick-up Repair Manual COOLING, HEATING AND AIR CONDITIONING SYSTEMS

TRANSMISSION AUXILIARY OIL COOLER | REMOVAL AND INSTALLATION (Refer to illustrations 5.1 and 5.4)

1. Some models will have an auxiliary oil cooler for transmission fluid, mounted behind the grille and in front of the radiator and air-conditioning condenser (see illustration). Air flowing through the grille cools the transmission fluid. The transmission pump circulates the fluid through the bottom radiator tank, through the auxiliary cooler and back to the transmission.
2. For best efficiency, the auxiliary transmission cooler (like the radiator and condenser), should be kept clean of dirt, mud, leaves or other debris. Use a brush to clean its front surface of loose dirt, then spray the engine side of the radiator with a high-pressure hose (aiming the spray toward the front of the vehicle) to drive out remaining dirt.
3. To remove the cooler, first remove the grille (see Chapter 11).
4. Disconnect the rubber hoses from the right-side of the cooler and plug them to prevent loss of transmission fluid (see illustration). Have a few rags handy under the cooler to catch any leakage.
5. The cooler is retained by a bracket at each end. To remove the cooler from the vehicle, remove the four screws holding the brackets to the body. If the cooler is to be replaced, unbolt the brackets from the cooler (two bolts and nuts at each end) and attach the brackets to the new cooler (see illustration 5.4).
6. Inspect the rubber hoses for fraying or cracks before reinstalling the cooler.

TRANSFER CASE

TRANSFER CASE SHIFT MOTOR (MODEL 229) | CHECK AND REPLACEMENT CHECK (Refer to illustrations 5.2, 5.3, 5.6, 5.8a, 5.8b and 5.8c)

1. Raise the vehicle and place it securely on jackstands.
2. Detach the front vacuum hose from the shift motor (see illustration).
3. Connect a hand-operated vacuum pump to the shift motor front port (see illustration).
4. Apply 15 in-HG of vacuum to the shift motor. Make sure the transfer case fully engages into 4WD by rotating the rear driveshaft.
5. The shift motor should maintain the vacuum applied to the front port for at least 30 seconds. If it doesn't, replace the motor. If it does, proceed to the next step.
6. Disconnect the vacuum pump from the front port, reattach the front vacuum hose to the front port, detach the rear vacuum hose from the rear shift motor port (see illustration), connect the vacuum pump to the rear port and apply 15 in-HG of vacuum to the motor.
7. The shift motor should maintain the vacuum applied to the rear port for at least 30 seconds. If it doesn't, replace the motor. If it does, proceed to the next Step.

Subject: 1972, 1973, 1974, 1975, 1976, 1077, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991 Jeep Wagoneer, Grand Wagoneer, Cherokee, J Series service, maintenance, repair. ISBN-10: 1563922428 | ISBN-13: 9781563922428 | Haynes 50029