Dodge RAM TRUCK 1500 1995 Service Manual page 304

7 - 3 4 COOLING SYSTEM SERVICE PROCEDURES
mm
WARNING: CONSTANT TENSION H O S E C L A M P S
A R E U S E D ON MOST COOLING S Y S T E M H O S E S ,
W H E N REMOVING OR INSTALLING, U S E ONLY
TOOLS DESIGNED FOR SERVICING THIS T Y P E O F
CLAMP, S U C H A S S P E C I A L CLAMP TOOL ( N U M B E R
6094) (FIG. 42)
B
SNAP-ON CLAMP TOOL ( N U M B E R
HPC-20) MAY B E U S E D FOR L A R G E R C L A M P S . AL­
WAYS W E A R S A F E T Y G L A S S E S W H E N SERVICING
CONSTANT TENSION C L A M P S .
CAUTION: A number or letter is stamped into the
tongue of constant tension clamps (Fig. 43). If re­
placement is necessary, use only an original equip­
ment clamp with a matching number or letter.
(4) Remove upper radiator hose clamp. Remove up­
per radiator hose at thermostat housing.
(5) Disconnect the wiring connectors at both of the
sensors located on thermostat housing.
(6) Remove six thermostat housing mounting bolts,
thermostat housing, gasket and thermostat. Discard
old gasket.
TEMP. COOLANT
RUBBER LIP SEAL J9407-16
Fig. 48 Thermostat—8.0L ¥-10 Engine
INSTALLATION
(1) Clean mating . areas of intake manifold and
thermostat housing.
(2) Check the condition (for tears or cracks) of the
rubber thermostat seal located in the intake manifold
(Figs. 46 or 48). The thermostat should fit snugly
into the rubber seal.
If seal replacement is necessary, coat the outer
(metal) portion of the seal with Mopar® Gasket
Maker. Install the seal into the manifold using Spe­
cial Seal Tool number C-3995-A with handle tool
number C-4171.
(3) Install thermostat into recessed machined
groove on intake manifold (Fig. 48).
(4) Install gasket on intake manifold and over
thermostat (Fig. 48).
(5) Install housing-to-intake manifold bolts.
Tighten bolts to 25 N-m (220 in. lbs.) torque.
CAUTION: Housing bolts should be tightened
evenly to prevent damage to housing and to pre­
vent leaks.
(6) Connect the wiring to both sensors.
(7) Install the upper radiator hose and hose clamp
to thermostat housing.
(8) Install support rod.
(9) Fill cooling system. Refer to Refilling Cooling
System in this group.
• (10) Connect negative battery cable to battery.
(11) Start and warm engine. Check for leaks.
THERMOSTAT OPERATION—5.9L DIESEL
ENGINE
The thermostat controls the operating temperature
of the engine by controlling the amount of coolant
flow to the radiator. When coolant temperature is be­
low 83°C (181°F), the thermostat is closed (Fig. 49).
Fig. 49 Thermostat Operation—5.9L Diesel—Typical
When coolant temperature reaches 83°C (181°F),
the thermostat begins to open allowing coolant flow
to the radiator. This provides quick engine warm-up
and overall temperature control. The thermostat is
designed to provide a minimum engine operating