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 upper radiator hose (Fig-
Upper Radiator Hose and Clamps OK
Gauge Indicates High
ure 5, Item 1) for loose clamps
- Proceed to Test Step 5.
Temperature, Does Not
(Figure 5, Items 2 and 4), cracks,
Upper Radiator Hose Clamps Loose
Function, or Is Inaccurate -
splits, damage, and Class III leaks
or Leaking at Connection - Tighten or
Continued
at radiator (Figure 5, Item 3) and
replace upper radiator hose clamp
thermostat housing (Figure 5,
(WP 0093).
Item 5).
Proceed to Test Step 9.
Upper Radiator Hose Cracked, Split,
Damaged, or Leaking - Replace upper
radiator hose (WP 0093).
Proceed to Test Step 9.
Test Step 5. Inspect Thermostat
Housing, Lower Radiator Hose, and
Water Pump for Leaks.
1. Inspect thermostat housing (Figure
Thermostat Housing OK - Proceed to
5, Item 5) for cracks, damage,
step 2.
loose bolts, or Class III leaks
Thermostat Housing Bolts Loose -
between thermostat housing (Fig-
Remove, clean, and install thermostat
ure 5, Item 5) and cylinder head
housing (WP 0130).
(Figure 5, Item 6).
Proceed to Test Step 9.
Thermostat Housing Cracked,
Damaged, or Leaking - Replace
thermostat housing (WP 0130).
Proceed to Test Step 9.
0021-8
