RAM 1500 Truck 4WD V8-5.9L VIN Z LDC (1999)
Transmission Cooler: Description and Operation
WATER-TO-OIL COOLER
All gas powered models equipped with an automatic transmission are equipped with a transmission oil cooler mounted internally within the radiator
side tank. This internal cooler is supplied as standard equipment on all gas powered models equipped with an automatic transmission.
The internal radiator oil cooler is not used with the diesel engine.
Transmission oil is cooled when it passes through this separate cooler. In case of a leak in the internal radiator mounted transmission oil cooler, engine
coolant may become mixed with transmission fluid or transmission fluid may enter engine cooling system. Both cooling system and transmission
should be drained and inspected if the internal radiator mounted transmission cooler is leaking.
Also refer to Transmission Air-to-Oil Coolers. This heavy duty air-to-oil cooler is an option on most engine packages. It is supplied as standard
equipment on both the 8.OL V-10 and 5.9L diesel engines.
AUXILIARY TRANSMISSION OIL COOLER
Auxiliary Transmission Oil Cooler-3.9/5.2/5.9L Engines
3.9/5.2/5.9L V-8 Gas Powered Engines: An optional air-to-oil transmission oil cooler is available with most engine packages. On the 3.9/5.2/5.9L V-8
engines, this optional cooler is located between the radiator and air conditioning condenser.
Auxiliary Transmission Oil Cooler-8.0L Engine
8.0L V-10 Engine: The air-to-oil cooler is located in front of and to the left side of the radiator. This secondary cooler is supplied as standard
equipment on models equipped with the 8.0L V-10 engine and an automatic transmission.
