RAM 2500 Truck 4WD L6-359 5.9L DSL Turbo VIN D FI (1998)
Transmission Cooler: Removal and Replacement
Auxiliary Cooler
REMOVAL
1. Remove front bumper.
2. Place a drain pan under the oil cooler.
3. Raise the vehicle.
4. Disconnect the oil cooler quick-connect fittings from the transmission lines. These are located near the power steering gearbox.
Auxiliary Transmission Oil Cooler-Diesel Engine
5. Remove the charge air cooler-to-oil cooler bolt.
6. Remove two mounting nuts.
7. Remove the oil cooler and line assembly towards the front of vehicle. Cooler must be rotated and tilted into position while removing.
INSTALLATION
1. Carefully position the oil cooler assembly to the vehicle.
2. Install two nuts and one bolt. Tighten to 11 Nm (95 inch lbs.) torque.
3. Connect the quick-connect fittings to the transmission cooler lines.
4. Install front bumper.
5. Start the engine and check all fittings for leaks.
6. Check the fluid level in the automatic transmission.
Water to Oil Cooler
REMOVAL
CAUTION: If a leak should occur in the water-to-oil cooler mounted to the side of the engine block, engine coolant may become mixed with
transmission fluid. Transmission fluid may also enter engine cooling system. Both cooling system and transmission should be drained and
inspected in case of oil cooler leakage.
1. Disconnect both battery negative cables.
2. Remove air cleaner assembly and air cleaner intake hoses.
3. Drain cooling system. Refer to Draining Cooling System.
4. Disconnect coolant lines from cooler.
5. Disconnect transmission oil lines from cooler. Plug cooler lines to prevent oil leakage.
