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Condition Possible Causes Correction No Forced Air in Panel 1. Vacuum line pinched or 1. Locate and repair vacuum leak or pinched line. 2. Faulty mode door. 2. Test actuator and door operation. Repair as 3. Faulty selector switch. 3. Test selector switch and replace if necessary. 4. Vacuum check valve. 4. Test check valve and replace if necessary. No Forced Air in Defrost 1. Vacuum line pinched or 1. Locate and repair vacuum leak or pinched line. 2. Faulty heat , defroster, or 2. Test actuators and door operation. Repair as 3. Faulty selector switch. 3. Test selector switch and replace if necessary. 4. Vacuum check valve. 4. Test check valve and replace if necessary. ONE-WAY CHECK VALVE (1) Disconnect the heating-A/C system vacuum supply (black) line in the engine compartment. This (2) Remove the one-way vacuum check valve. The valve is located on the vacuum supply (black) line at (3) Connect the Vacuum Test Probe from the Vac- uum Test Set to the heater side of the one-way vac- (4) Connect the Vacuum Test Probe from the Vac- uum Test Set to the engine side of the one-way vac- A/C-HEATER CONTROLS NOTE: The operation of the recirculation-air door & AIR CONDITIONING/DISTRIBUTION/ BLOWER MOTOR - REMOVAL). (1) Connect the Vacuum Test Probe to the vehicle vacuum supply (black) line. Position the Vacuum Test (2) Start with the mode control in the Panel posi- tion and the recirculation control in the Outside-air (3) Move the recirculation control to the Recircula- tion position (the recirculation-air door should move move the mode control to the Defrost position (the (4) If the Vacuum Test Gauge achieves the cali- brated setting but the recirculation-air door does not LOCATING VACUUM LEAKS (1) Connect the Vacuum Test Probe to the vehicle vacuum supply (black) line. Position the Vacuum Test (2) Place the mode control in the Panel position and the recirculation control in the Recirculation (3) Remove the center instrument panel bezel. (black) line at the A/C-heater control. The Vacuum (6) If there is no leak in the vacuum supply (black) line, reconnect it to the A/C-heater control and NOTE: The vacuum port for the recirculation door 24 - 16 CONTROLS PL/SRT-4 A/C HEATER CONTROL (Continued) |