PL720 2WD L4-1952cc 2.0L SOHC (Z20) (1985)
Thermal Vacuum Valve: Testing and Inspection
Fig. 54 Thermal vacuum valve test
1.
Drain a portion of engine coolant, then remove thermal vacuum valve from engine.
2.
Inhale air from air cleaner side port, Fig. 54. Ensure valve opens at temperatures between 59°F and 140°F and is closed at all other temperatures.
Do not allow water to get inside valve.