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ENGINE COOLING
1
A. PROBLEMS NOT REQUIRING DISASSEMBLY OF COOLING SYSTEM
-
1. LARGE OBSTRUCTIONS BLOCKING RADIATOR OR CONDENSER
a.
AUXILIARY OIL COOLERS
b. LICENSE PLATES
1
RE LOCATE
c. SPARE TIRES
d. ICE, MUD OR SNOW OBSTRUCTING GRILLE
-
REMOVE
2. ENGINE OIL OVERFILL
-
CHECK ENGINE OIL DIPSTICK
3.
WRONG RADIATOR FOR APPLICATION
-
CHECK PART NO. AGAINST PARTS LlST
4. LOOSE, DAMAGED OR MISSING AIR SEALS
-
SEE BODY SERVICE MANUAL
5. MISSING OR DAMAGED LOWER AIR BAFFLE
-
SEE BODY SERVICE MANUAL
6.
WRONG IGNITION TIMING
-
SEE CHASSIS SERVICE MANUAL
I
6. PROBLEMS REQUIRING DISASSEMBLY OF COOLING SYSTEM
-
1. INCORRECT OR DAMAGED FAN
-
CHECK PART NO. AGAINST PARTS LlST
2. FAULTY EMISSION SYSTEM COMPONENTS (COULD CAUSE OVERHEATING A T IDLE)
a.
PCV VALVE
1
SEE CHASSIS SERVICE MANUAL
b. TVS OR TCS
3.
PRESSURE CHECK COOLING SYSTEM WITH PRESSURE CAP INSTALLED
-
WILL SHOW
I F PRESSURE CAP LEAKS BECAUSE OF RADIATOR FILLER NECK DAMAGE
4. DEFECTIVE WATER PUMP
a. ERODED OR BROKEN IMPELLER VANES
b.
FAILED BEARING OR SEAL
-
CHECK FOR SHAFT OR BEARING PLAY
5. PLUGGED RADIATOR TUBES
-
SEND TO RADIATOR REPAIR SHOP FOR FLOW CHECK
6.
INTERNAL SYSTEM LEAKS
a.
HEAD GASKET
-
SEE CHASSIS SERVICE MANUAL
b. CRACKED BLOCK
c. TIMING CHAIN COVER
d. INTAKE MANIFOLD GASKET
7. PLUGGED COOLANT PASSAGES IN CYLINDER HEADS
-
REMOVE HEADS AND CHECK VISUALLY
1381
I
Fig. 66-10 Cooling System Diagnosis Chart
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