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Home >> Ford >> 2002 >> Crown Victoria Base, 4.6 9 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> General Servicing >> HVAC Systems - General Servicing >> Manifold Gauge Set >> Connecting Gauge Set >> Schrader-Type Valves

Schrader-Type Valves

  1. Put on safety goggles and cover vehicles fender. Slowly remove protective caps from Schrader valves to check for leaky valves.
    CAUTION: Ensure hand valves on manifold gauge set and the hose-end shutoff valves are closed before attaching test hoses to Schrader valves.
  2. Ensure service hoses are equipped with valve core depressor to match Schrader valve. If not, install special adapters for this purpose. If the high-side service hose connector will not fit on high-side Schrader valve, a special adapter must be used. See SPECIAL VALVE CONNECTORS .
  3. Ensure both manifold gauge set hand valves are closed. Connect low-side service hose to low-side (suction) service valve and finger tighten connections. Connect high-side service hose to high-side (discharge) service valve and finger-tighten connections.
NOTE: After test gauges are installed, test hoses must be purged of all air before proceeding with testing.
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