Grand Cherokee 2WD L6-242 4.0L VIN S MFI (1993)
Control Assembly: Testing and Inspection
1. Connect the test vacuum probe to the vehicles (black) vacuum supply hose. Position vacuum test gauge so it can be viewed from the passenger
compartment.
2. Position the heater-A/C control mode selector to DEFROST, FLOOR, BI-LEVEL, PANEL or RECIRC (with A/C ). Pause after each selection.
The test gauge should return to the calibrated setting of -27 kPa (8 in. Hg.) after each selection is made. If the gauge cannot achieve the calibrated
setting, a vacuum circuit or component has a leak.
