Blower Control
Blower control knob is located on left side of control panel. There are 4 blower speed settings.
Mode Control
Mode control knob is located in center of control panel. It operates a series of vacuum actuated motors which position mode doors, directing air flow to selected outlets.
Temperature Control
Temperature control knob at right side of control panel activates an electric motor which operates blend-air door in the heater case. This directs air through or around the heater core. Mixing of air determines temperature at outlets.
BLOWER MOTOR
- Blower Does Not Run Check for blown fuse, loose connection or poor ground. Check for faulty switch, motor, relay or resistor.
- Blower Runs At One Speed Check for faulty switch, resistor or fuse.
- Blower Runs But No Air Circulation Check for blocked air inlet, fan not attached to motor shaft, or inoperative air inlet door.
- Little Or No Air From Defroster Outlets Check for misaligned defroster duct, leaking air duct seals, defroster duct damaged or obstructed, or vacuum motor inoperative.
COMPONENT TESTS
| WARNING | To avoid injury from accidental air bag deployment, read and carefully follow all SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM procedures in AIR BAG SYSTEM SAFETY article in GENERAL SERVICING. |
- Disconnect blower motor electrical connector. Turn ignition on. Turn blower motor switch to any position. Place mode selector switch to any position other than off. Using a test light, check for power at blower motor connector. If power exists, go to next step. If power does not exist, test blower motor relay. See «BLOWER MOTOR RELAY»(ref-11465-S30005953252000111400000) .
- Using jumper wires, connect power to a blower motor terminal. Connect remaining terminal to ground, while listening for blower motor operation. If blower motor operation is not heard or blower motor operates with excessive noise, replace blower motor. If blower motor operates smoothly and without excessive noise, blower motor is okay.
BLOWER MOTOR RELAY
- Locate blower motor relay. Relay is located in wiring harness connector that is secured to heater housing, behind glove box. Remove relay from connector.
- Using DVOM connected to ground, check for battery voltage at cavity No. 30 of connector. (Scheme 6) If battery voltage does not exist, check power feed from fuse No. 6 (40-amp) of Power Distribution Center (PDC). If battery voltage exists, go to next step.
- Turn ignition switch to ON position. Using DVOM connected to ground, check for battery voltage at cavity No. 86 of connector. (Scheme 6) If battery voltage does not exist, check power feed from fuse No. 25 (15-amp) of junction block (located behind right kick panel). If battery voltage exists, go to next step.
- Using an ohmmeter, check for continuity between terminals No. 87A and 30 of blower motor relay. (Scheme 6) If continuity does not exist, replace blower motor relay. Ensure continuity does not exist between blower motor relay terminals No. 30 and 87. If continuity exists, replace relay. If continuity does not exist, go to next step.
- Measure resistance between blower motor relay terminals No. 85 and 86. Reading should be 70-80 ohms. If reading is not as specified, replace blower motor relay. If reading is as specified, go to next step.
- Using jumper wires, connect battery voltage to blower motor relay terminal No. 86 and ground terminal No. 85. (Scheme 6) Ensure continuity exists between terminals No. 30 and 87. Ensure continuity does not exist between terminals No. 87A and 30. If continuity is not as specified, replace blower motor relay. If continuity is as specified, blower motor relay is okay.
