COOLING SYSTEM
8-10
TNV DI Service Manual
Engine Coolant Pump
Disassembly of Engine Coolant
Pump
1. Remove the thermostat cover (Figure 8-8, (1)).
Discard the gasket.
Figure 8-8
2. Remove the thermostat (Figure 8-8, (2)).
Discard the O-ring. Remove the temperature
switch (Figure 8-8, (3)) and gasket
(Figure 8-8, (4)). Discard the gasket.
Cleaning and Inspection
Temperature Switch
1. Check for proper operation of the temperature
switch. Connect a continuity light or ohmmeter
to the temperature switch. Connect one lead to
the terminal of the switch (Figure 8-9, (1)) and
the other lead to the metal portion of the switch
(Figure 8-9, (2)).
Figure 8-9
2. Place the temperature switch and an accurate
thermometer (Figure 8-9, (3)) in engine
coolant.
3. Slowly increase temperature of the fluid using
an external heat source.
4. The temperature switch is operating properly if
the continuity light or ohmmeter indicates
continuity when the fluid temperature reaches
225°F - 235°F (107°C - 113°C).
Water temperature sensor
1. Inspect the water temperature sensor to make
sure that it is properly operating. As shown in
the following figure, connect an electric resistor
to the coupler of the water temperature sensor
(Figure 8-10, (1)).
Figure 8-10
(1)
(2)
(3)
(4)
0000267A
0000577A
(2)
(1)
(3)
(1)
(2)
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