Thermal Vacuum Switch (TVS)
- With the air cleaner temperature below 40°F (-4°C), disconnect vacuum hoses from TVS and connect vacuum source to large outlet.
- Apply vacuum to TVS. TVS should hold vacuum. If not, replace TVS.
- Start engine and warm air cleaner to 55°F (13°C), or greater. TVS should not hold vacuum. If it does, replace TVS.