There is no need to remove the pressure cap at any
time except for the following purposes:
• Checking and adjust antifreeze freeze point.
• Refilling system with new coolant.
• Conducting service procedures.
• Checking for vacuum leaks.
WARNING: IF VEHICLE HAS BEEN RUN RECENTLY,
WAIT 15 MINUTES BEFORE REMOVING CAP. THEN
PLACE A SHOP TOWEL OVER THE CAP AND WITH-
OUT PUSHING DOWN ROTATE IT COUNTERCLOCK-
WISE TO THE FIRST STOP. ALLOW FLUIDS TO
ESCAPE THROUGH THE OVERFLOW TUBE AND
WHEN THE SYSTEM STOPS PUSHING OUT COOL-
ANT AND STEAM AND PRESSURE DROPS,
REMOVE THE CAP COMPLETELY. SQUEEZING THE
RADIATOR INLET HOSE WITH A SHOP TOWEL (TO
CHECK PRESSURE) BEFORE AND AFTER TURNING
TO THE FIRST STOP IS RECOMMENDED.
RADIATOR
CLEANING
Clean radiator fins are necessary for good heat
transfer. The radiator and air conditioning fins
should be cleaned when an accumulation of debris
has occurred. With the engine cold, apply cold water
and compressed air to the back (engine side) of the
radiator to flush the radiator and/or A/C condenser of
debris.
INSPECTION
Inspect the radiator side tanks for cracks, broken
or missing fittings also inspect the joint where the
tanks seam up to the radiator core for signs of leak-
age and/or deteriorating seals.
Inspect radiator core for corroded, bent or missing
cooling fins. Inspect the core for bent or damaged
cooling tubes.
COOLING SYSTEM CLEANING/FLUSHING
CLEANING
CAUTION: Internal radiator pressure must not
exceed 138 kPa (20 psi) as damage to radiator may
result.
Reverse flushing of cooling system is the forcing of
water through the cooling system. This is done using
air pressure in the opposite direction of normal cool-
ant flow. It is usually only necessary with very dirty
systems with evidence of partial plugging.
(1) Drain cooling system. Remove thermostat hous-
ing and thermostat. Install thermostat housing.
(2) Connect a suitable cooling system flusher and
follow instructions supplied with flusher.
INSPECTION
After performing a flush procedure, inspect all
hoses, clamps and connections for deterioration and
leaks. Inspect radiator and heater core for leaks.
TRANSMISSION OIL COOLER
CLEANING
Check the external cooler for debris on the cooling
fin surfaces. Clean as necessary. For internal clean-
ing/flushing procedures, refer to TRANSAXLE.
INSPECTION
Inspect all cooler lines and clamps. Replace as nec-
essary.
ADJUSTMENTS
BELT TENSION
Use belt tension gauge, Special Tool 7198 for con-
ventional V-belts and Poly-V belts.
Adjust the belt tension for NEW or USED belt ten-
sion applications. Refer to Belt Tension Chart.
BELT TENSION CHART—2.7/3.2/3.5L ENGINES
POLY-V BELT GAUGE
Generator/Power
Steering Belt (all
engines)
New Belt: 836 644 N (190
610 lbs.)
Used Belt: 534 N (120 lbs.)
V-BELT GAUGE
Air Conditioning Belt
(3.2/3.5L only)
New Belt: 667 644 N (150
610 lbs.)
Used Belt: 534 N (120 lbs.)
LH COOLING SYSTEM 7 - 37
CLEANING AND INSPECTION (Continued)
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