Hyundai HDF 50-7S, Service Manual

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COOLING SYSTEM
10-5
2.2 Inspecting thermostat
CAUTION
Be careful of burns or a fire when measuring tempera-
ture, as it involves a high-temperature and open flame.
To test the thermostat operation, immerse the thermostat in a
container filled with water. Heat the water, while measuring
the water temperature. Record the temperature at the
conditions shown in the table below. If the temperatures are
not within the standard range, replace the thermostat.
Note: (a) Stir the water in the container with a stick to
ensure uniform temperature distribution.
(b) Before installing the thermostat, be sure to check
the valve opening temperature stamped on the
thermostat valve side face.
Inspecting thermostat
Item Standard
Temperature at which valve starts opening
76.5 ± 1.5°C
[170 ± 3.5°F]
Temperature at which valve lift becomes
9 mm [0.35 in.] or more. 90 ± 1.5°C
[194 ± 2.7°F]
0
9
[0.35]
76.5 °C
[170°F]
V
alve lift mm [in.]
Temperature
90°C
[194°F]
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