Automatic Transmission Cooler: Overview Dodge Pickup R2500

DESCRIPTION

An air-to-oil transmission oil cooler is standard on all engine packages. The transmission oil cooler is mounted to the front of the radiator above the power steering cooler (Scheme 96)

An air-to-oil transmission oil cooler is standard on all engine packages. The transmission oil cooler is mounted to the front of the radiator above the power steering cooler (Scheme 97)

OPERATION

Transmission oil is routed through the cooler where heat is removed from the transmission oil before returning to the transmission. Vehicles equipped with the 5.9L engine have an internal thermostat that controls fluid flow through the cooler. When the transmission fluid is cold (less than operating temperature) the fluid is routed through the cooler bypass. when the transmission fluid reaches operating temperatures and above, the thermostat closes off the bypass allowing fluid flow through the cooler. The thermostat is serviceable.

Note. Vehicles with the 3.7L/4.7L engines are not equipped with the oil cooler thermostat.

Scheme 96

Scheme 97

1. Disconnect the battery negative cable.
2. Place a drain pan under the oil cooler lines.
3. Disconnect the transmission oil cooler line quick-connect fitting at the cooler outlet using the quick connect release tool 6935. Plug the cooler lines to prevent oil leakage.
4. Unsnap the transmission cooler tubes from the radiator tank clips.
5. Remove the bolts attaching the transmission cooler to the radiator.
6. Remove oil cooler from the vehicle. Take care not to damage the radiator core or transmission cooler tubes.

All diesel models equipped with an automatic transmission are equipped with both a main water-to-oil cooler and a separate air-to-oil cooler. Both coolers are supplied as standard equipment on diesel engine powered models when equipped with an automatic transmission.

The main water-to-oil transmission oil cooler is mounted to a bracket on the intake side of the engine (Scheme 98)

The air-to-oil cooler is located in front of and to the left side of the radiator (Scheme 99)

Scheme 98

The transmission oil is routed through the main cooler first, then the auxiliary cooler where additional heat is removed from the transmission oil before returning to the transmission. The cooler has an internal thermostat that controls fluid flow through the cooler. When the transmission fluid is cold (less then operating temperature), the fluid is routed through the cooler bypass. When the transmission fluid reaches operating temperatures and above, the thermostat closes off the bypass allowing fluid flow through the cooler. The thermostat is serviceable.

Scheme 99

1. Remove Charge Air Cooler (Refer to «REMOVAL»(ref-189685-S38201956202005091100000) ).
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.
5. Remove the charge air cooler-to-oil cooler bolt see scheme 6
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.