Service manual

G420F(FE) Service Manual Chapter 3. Engine Mechanical System 63
Thermostat
COMPONENTS
INSPECTION
1. Check the valve closed at room temperature.
2. Check for defect or damage.
3. Heat the thermostat as shown in the illustration
and measure the valve open temperature and full
open temperature.
Valve open temperature
Open 82°C
Full open 95°C
INSTALLATION
1. Check that the thermostat flange is correctly
inserted to the thermostat housing socket. At this
time, upward the jiggle valve and make contact to
the hole.
2. Install a new gasket and water inlet fitting.
3. Add coolant.