Durango 2WD V8-5.9L VIN Z LDC (2000)
Vacuum Check Valve HVAC: Testing and Inspection
1. Remove the vacuum check valve that is to be tested. The valves are located in the vacuum supply tube (black) at the power brake booster on the
left side of the engine compartment, and in the heater and air conditioner vacuum take-out of the vacuum supply tube in the engine compartment.
The vacuum check valve must be removed in order to perform the following tests.
2. Connect the test set vacuum supply hose to the heater-A/C control side of the valve. When connected to this side of the check valve, no vacuum
should pass and the test set gauge should return to the 27 kPa (8 in. Hg.) setting. If OK, go to step Step 3. If not OK, replace the faulty valve.
3. Connect the test set vacuum supply hose to the engine vacuum side of the valve. When connected to this side of the check valve, vacuum should
flow through the valve without restriction. If not OK, replace the faulty valve.
