Chrysler RAM TRUCK 2500 1994 Service Manual page 256

COOLING SYSTEM 7 - 1
COOLING SYSTEM
CONTENTS
page
AUTOMATIC TRANSMISSION OIL COOLERS .. 47
DIAGNOSIS 4
ENGINE ACCESSORY DRIVE BELTS §1
GENERAL INFORMATION
Throughout this group, references are made to par­
ticular vehicle models by alphabetical designation or
by the particular vehicle nameplate. A chart showing
a breakdown of alphabetical designations is included
in the Introduction section at the beginning of this
manual.
A l l vehicles are equipped with either a 3.9L V-6 en­
gine, a 5.2L V-8 engine, two different 5.9L V-8 en­
gines, an 8.0L V-10 engine or a 5.9L Cummins in-line
6 cylinder diesel engine.
The 3.9L V-6 and 5.2L V-8 engines will be referred
to i n this Cooling group as: LDC (Light Duty Cycle)
engines. The 5.9L V-8 gas powered engine will be re­
ferred to as either: LDC (Light Duty Cycle) or HDC
page
ENGINE BLOCK HEATERS 58
SERVICE PROCEDURES 16
SPECIFICATIONS 5i
(Heavy Duty Cycle) engine. The 8.0L V-10 engine will
be referred to as: HDC (Heavy Duty Cycle) engine.
Either of the HDC gas powered engines can be eas­
ily identified by the use of an engine mounted air in­
jection pump. The 3.9L V-6, 5.2/5.9L V-8 LDC gas
engines or the diesel engine will not use an air injec­
tion pump.
COOLING SYSTEM
The cooling system regulates engine operating tem­
perature. I t allows the engine to reach normal oper­
ating temperature as quickly as possible. I t also
maintains normal operating temperature and pre­
vents overheating.
The cooling system also provides a means of heat­
ing the passenger compartment and cooling the auto-
Fig. 1 Typical Cooling System Flow—Gas Powered Engines