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Home >> Jeep >> 1984 >> Pickup J20 >> Repair and Diagnosis >> Engine Performance >> System >> EGR System >> Testing >> Thermal Vacuum Switch

Thermal Vacuum Switch

  1. With air cleaner temperature below 40°F (-4°C), disconnect vacuum hoses from TVS and connect vacuum source to large outlet.
  2. Apply vacuum to TVS. Vacuum should be held. If not, replace TVS.
  3. Start engine and warm air cleaner to 55°F (13°C), or above. Vacuum should not be held. If it is held, replace TVS.
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