Altitude Compensator: Testing and Inspection

Fig. 60 Connecting A Vacuum Pump To Test The HAC (Lower Nipple):

HIGH ALTITUDE COMPENSATOR INSPECTION (FEDERAL VEHICLES)

BELOW 1,200 m (3,900 ft.)

1. Disconnect the lower vacuum hose from the high altitude compensator and connect a hand vacuum pump to the nipple the hose was removed from.
2. Apply vacuum and verify that vacuum leaks.

Fig. 60 Connecting A Vacuum Pump To Test The HAC (Lower Nipple):

3. Disconnect the vacuum hose from the high altitude compensator upper nipple and connect a hand vacuum pump to the nipple the hose was removed from.
4. Apply vacuum and verify that vacuum does not leak.

Fig. 62 High-Altitude Compensator Valve (California):

ABOVE 1,200 m (3,900 ft.)

1. Disconnect the vacuum hose from the high altitude compensator lower nipple and connect a hand vacuum pump to the nipple the hose was removed from.
2. Apply vacuum and verify that vacuum holds.

Fig. 60 Connecting A Vacuum Pump To Test The HAC (Lower Nipple):

HIGH ALTITUDE COMPENSATOR INSPECTION (CALIFORNIA VEHICLES)

BELOW 1,200 m (3,900 ft.)

1. Disconnect the lower vacuum hose from the high altitude compensator and connect a hand vacuum pump to the nipple it was removed from.
2. Apply vacuum and verify that it leaks.

Fig. 60 Connecting A Vacuum Pump To Test The HAC (Lower Nipple):

3. Disconnect the upper hose from the high altitude compensator and connect a hand vacuum pump to the nipple the hose was removed from.
4. Apply vacuum and verify that it holds.

Fig. 60 Connecting A Vacuum Pump To Test The HAC (Lower Nipple):

ABOVE 1,200 m (3,900 ft.)

1. Disconnect the vacuum hose from the lower high altitude compensator nipple and connect a hand vacuum pump to the nipple the hose was removed from.
2. Apply vacuum and verify that it holds