TM 5-2420-231-23-1
0021
Table 1. Engine Coolant Temperature Gauge Indicates High Temperature,
Does Not Function, or Is Inaccurate - Continued.
021
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Engine Coolant Temperature 2. Inspect water pump (Figure 6,
Water Pump OK - Proceed to step 3.
Gauge Indicates High
Item 1) for Class III leaks at water
Water Pump Leaks - Replace water
Temperature, Does Not
pump shaft (Figure 6, Item 2).
pump (WP 0128).
Function, or Is Inaccurate -
Proceed to Test Step 9.
Continued
Figure 6. Water Pump.
0021
3. Inspect lower radiator hose (Figure
Lower Radiator Hose and Clamps OK
7, Item 1) for loose clamps (Figure
- Proceed to step 4.
7, Items 2 and 4), cracks, splits,
Lower Radiator Hose Clamps Loose
damage, or Class III leaks at radia-
or Leaking at Connection - Tighten or
tor (Figure 7, Item 3) and water
replace upper radiator hose clamp (WP
inlet housing (Figure 7, Item 8).
0093).
Proceed to Test Step 9.
Lower Radiator Hose Cracked, Split,
Damaged, or Leaking - Replace upper
radiator hose (WP 0093).
Proceed to Test Step 9.
4. Inspect heater hose (Figure 7,
Heater Hose and Clamps OK -
Item 6) for loose clamps (Figure 7,
Proceed to step 5.
Item 7), cracks, splits, damage, or
Heater Hose Clamp Loose or Leaking
Class III leaks at heater shutoff
at Connection - Tighten or replace
valve (Figure 7, Item 5).
heater hose clamp (WP 0093).
Proceed to Test Step 9.
Heater Hose Cracked, Split,
Damaged, or Leaking - Replace cab
heater hose (WP 0354).
Proceed to Test Step 9.
