Temperature Switch
- Remove temperature switch from engine. Connect a piece of vacuum hose to each port of temperature switch, then submerge switch in a container of water with open end of hoses outside container.CAUTION: Do not allow water to enter temperature switch.
- With water temperature below 149°F (65°C), blow air into switch. Switch should be open and air should pass through switch freely. If not, replace temperature switch.
- Heat water to above 174°F (79°C) and again blow air into switch. Switch should now be closed and air should not pass through switch. If air passes through switch, switch is defective and should be replaced.