Service Manual
3-18 COOLING SYSTEM
Thermostat
This cooling system is equipped with a thermostat to maintain a
optimum operating temperature.
Coolant bypasses the closed thermo-
stat when cold until operating temperature is attained,
Thermostat Removal
0 Remove
Radiator (see Radiator Removal)
Cooling Fan (see Cooling Fan Removal) -
@Loosen the hose clamp (A) and disconnect the radiator hose (B) at
the thermostat cover.
l
Unscrew the thermostat cover bolts (C), and remove the cover.
l
Take off the thermostat (D).
NOTE
0 With the thermostat installed, the jiggle valve may be positioned
up-side of the thermostat when installing.
Thermostat Inspection
@Remove the thermostat, and check the jiggle valve (A) for sticking or
binding on the flange (8) due to accumulation of a rust, scale or lime.
Clean up the valve to ensure free movement of the valve (C), if
necessary.
l
inspect the thermostat valve (1) at room temperature.
*If the valve is open, replace the valve with a new one.
@To check valve openning temperature, suspend the thermostat and an
accurate thermometer (2) in a container filled with a water.
@Place the container over a source of heat and gradually raise the
temperature of the water while stirring the water gently.
0
Watch the valve. The valve should begin to open at the temperature
specified.
0
It should be fully opened to 7mm (0.28 in) or more at the temperature
specified.
Thermostat Valve Specification
Begin Opening 63 to 66 “C (145 to 150°F)
Full Open 60°C (176°F)
The thermostat and thermometer must not touch the container sides.
*If the thermostat fails any of these check, replace it.
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