Air-To-Oil Cooler - Dodge ram truck 3500 1996 Service Manual

7 - 8 COOLING SYSTEM B R
D E S C R I P T I O N A N D O P E R A T I O N (Continued)
Fig. 8 Thermostat Operation-—5*91 Diesel—Typical
being filled. I t is also used to block the flow of cool­
ant during engine operation (all coolant will pass
through the thermostat).
Water pressure (or flow) will hold the pin closed.
When the engine is off, the check valve will be in
the open position. When the engine is operating, the
check valve will be in the closed position.
The check valve is located inside of a brass fitting.
This fitting is threaded into the front of the cylinder
head (Fig. 9). I t is connected to the thermostat hous­
ing with a rubber hose and screw-type clamps (Fig.
9).
Fig. 9 One-Way Check Valve (Jiggle Pin) Location
AUTOMATIC TRANSMISSION OIL COOLERS—GAS
ENGINES
MMTER-TO-OIL
COOLER
All gas powered models equipped with an auto­
matic 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. I n case of a leak in the internal
radiator mounted transmission oil cooler, engine cool­
ant may become mixed with transmission fluid or
transmission fluid may enter engine cooling system.
Both cooling system and transmission should be
drained and inspected i f the internal radiator
mounted transmission cooler is leaking.
Also refer to the section on Transmission Air-to-Oil
Coolers. This heavy duty air-to-oil cooler is an option
on most engine packages. I t is supplied as standard
equipment on both the 8.0L V-10 and 5.9L diesel
engines.
AIR-TO-OIL COOLER
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 5.2/5.9L V-8 engines,
this optional cooler is located between the radiator
and air conditioning condenser (Fig. 10).
UPPER RADIATOR TRANS. OIL
SUPPORT BRACKET C O O L E R
BOLT UPPER
BOLTS 121 COOLER
1 LOWER
M O U N T I N G
BOLT J9407-40
Fig. 10Air-To-Oil Cooler—3.9L V-6 or 5.2/5.9L V-8
Engines