Compressor Output Test (1970-73)
- Turn climate control system off, if equipped. Place transmission in "N", and run engine until fast idle screw is off fast idle cam. Turn engine off. Release compressed air in system, using tire-type bleed valve at compressor.
- Remove high pressure line, at compressor, and attach suitable test gauge (T68N-5A681-B). Start engine. Pressure should build to 60-90 psi in a few seconds. If this pressure is not observed, accelerate-decelerate engine to build pressure. Turn engine off.
Courtesy of FORD MOTOR CO.
- Observe test gauge reading for evidence of compressor air leak. If air leak is present, apply leak-detector fluid at all connections and at diaphragm between first and second stage housings. Tightening of housing through-bolts may correct diaphragm leak.
- Apply leak-detector fluid at all test gauge connections. Correct any leak by tightening screws and/or connections, or by replacing parts. If compressor fails to cycle, check vacuum line before removing compressor. Satisfactory pressure buildup indicates problem is in height control valve.