LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mercury >> 1983 >> Capri Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> THERMACTOR System >> Testing >> Air Bypass/Air Control Valve >> Normally Open Valve
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Normally Open Valve

  1. With engine at normal operating temperature, parking brake applied and transmission in "P" or "N," disconnect hoses from outlets "A" and "B." See Figure . Disconnect and plug vacuum line to ports "D" and "S".
  2. With engine at 1500 RPM, air should flow out of port "B." Apply 8-10 in. Hg vacuum to port "S." With engine at 1500 RPM, air should flow from port "A".
  3. Reconnect line to port "D" and ensure vacuum is present. With engine at 1500 RPM, air should flow from bypass vents. If valve fails any of these tests, replace valve. Reconnect hoses.
scientia non olet · About LEMON Manuals