EGR Thermo Valve

THERMO VALVE TESTING

Thermo Valve Test:

1. Disconnect the vacuum hoses from the thermo valve, and connect a hand vacuum pump to a nipple of the thermo valve.
2. When the engine coolant temperature is below 50~C (122~F), vacuum applied to the valve should LEAK.
3. When the engine coolant temperature has reached 80~C (176~F) or more, the vacuum applied to the valve should HOLD.