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Home >> Mercury >> 1981 >> Lynx RS, 2D Hatchback, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> THERMACTOR Systems >> Testing >> Check Valve
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Check Valve

  1. Disconnect air supply hose at pump side of check valve. Blow through check valve toward manifold, then attempt to suck back through valve. Flow should be toward manifold only.
  2. If available, connect bulb type tester (T75L-9487-A or equivalent) to pump side of check valve. Squeeze bulb as flat as possible and release. Bulb should not return to normal size in less than 15 seconds.
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