Cooling System
02
070
13
RG,RG34710,234 –19–30SEP97–1/1
Test Thermostat Opening Temperature
RG5971 –UN–23NOV97
Testing Thermostats
1. Remove thermostats. (See REMOVE THERMOSTATS
earlier in this group.)
CAUTION: DO NOT allow thermostat or
thermometer to rest against the side or bottom
of container when heating water. Either may
rupture if overheated.
2. Visually inspect thermostats for corrosion or damage.
Replace thermostats as a matched set as necessary.
3. Suspend thermostats and a thermometer in a container
of water.
4. Stir the water as it heats. Observe opening action of
thermostat and compare temperatures with
specification given in chart below.
Specification
Thermostat Test—Rating 82°C(180°F)......................................................
Initial Opening (Range)
Temperature 80—84°C (175—182°F).........................................................
Full Open (Nominal) Temperature 94°C(202°F)........................................
NOTE: Due to varying tolerances of different supplies,
initial opening and full open temperatures may
vary slightly from specified temperatures.
5. Remove thermostat and observe its closing action as it
cools. In ambient air the thermostat should close
completely. Closing action should be smooth and slow.
6. If any one thermostat is defective, replace both
thermostats.
CTM100 (06APR04)
02-070-13
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=297
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