System Functional Test

Measure and record rear fender opening height. Discharge system completely, through compressor bleed valve. Place 400-lb. load in trunk or on tailgate. Again measure and record fender opening height. Start engine and allow to idle. Determine if compressor is operating (feel with hand). If not, check vacuum line for proper connections. If compressor is still inoperative, replace it. If unit is operating, run engine until compressor stops (10-15 min.). Measure and record rear fender opening height. Difference between this measurement and measurement after placing weight on vehicle should be 3/4" minimum. If less than 3/4", accelerate-decelerate engine to determine if measurement changes. Remove load from vehicle. After two minutes, measure and record rear fender opening height. Difference between this measurement and original measurement must not be greater than 1/4".