COOLING SYSTEM
TESTING AND ADJUSTING
TM 5-3805-263-14&P-2
The locations for making the temperature checks
with probe are listed below:
PROBE LOCATIONS
TEMPERATURES
Top Tank (Fig. 2) and
Ambient (Fig. 1)
Maximum 110°F (61°C) difference.
Top Tank (Fig. 2) and
Maximum 15° F (9°C) difference.
Bottom Tank (Fig. 3)
Top Tank (Fig. 2)
Under normal conditions, temperature
difference maximum 40°F (22°C).
Top Tank (Fig. 2) and
Maximum 2°F (1°C) difference with
Regulator Housing (Fig. 2)
regulators open.
PROBLEM
Overheating
Not enough
Water Flow
Overheating
Overcooling
Overheating
CHECK FOR
Wrong Gear Selection.
Radiator Core with Restriction to Air Flow.
Bent Radiator Fins.
Low Fan Speed.
Damaged Fan Guard.
Wrong Blade Position.
Defect in Water Pump
Collapsed Hoses.
Restriction in Radiator Core Tubes.
Low Coolant Level.
Wrong Gear Selection.
Engine Operated with too Great a Load.
Temperature Regulator will not Close.
Regulator Seals Leaking.
Coolant Flow Past the Regulator Flange
Low Ambient Temperature with Light Loads
Temperature Regulators will not Open.
Be sure the probe is installed in the liquid of the system being tested.
CAUTION
Do not tighten the probe to more than 30 lb. ft. (40 N•m) torque.
Check temperatures in the locations listed in the chart and make a comparison of these temperatures. Look at
the chart to see if these comparisons are within the range in the chart. Make the needed checks if the
temperatures are not within the ranges.
NOTE: To get the correct reading make a measurement of the temperatures during working conditions.
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