Compressor Output Test

Turn climate control system off, if equipped. Place transmission in "N"; 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. 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 thru-bolts may correct diaphragm leak. Apply leak detector fluid at 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.