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Heater System - Tracker: Other Chevrolet Tracker II

Heater 3 illustrations ~1688 words

Ventilation

Airflow is discharged from upper instrument panel outlets. Quantity of airflow is controlled by blower speed setting and vehicle speed.

Bi-Level

Airflow is discharged from upper instrument panel outlets and floor outlets. Air delivered to the floor outlets is warmer than air to instrument panel outlets.

Major portion of airflow is discharged from floor outlets. A small amount of airflow is directed to windshield defroster outlets.

Heat/Defrost

Airflow is divided between floor outlets, windshield defrost outlets and side window outlets.

Defrost

Airflow is discharged from defrost outlets. A small amount of airflow is delivered to side window and floor outlets.

FRESH/RECIRCULATION CONTROL LEVER

The fresh/recirculation control lever mechanically operates a cable which opens or closes fresh/recirculation mode door to fresh (outside) air. When fresh/recirculation lever is set to fresh, outside air is delivered to vehicle interior. With lever in fresh mode, as vehicle speed increases, in addition to blower motor speeds, airflow through system increases. When lever is in recirculation position, outside air is shut off and air from inside passenger compartment is recirculated through blower motor to selected air outlets. (Scheme 3)

Scheme 3

Scheme 3: FRESH/RECIRCULATION CONTROL LEVER
Scheme 3: FRESH/RECIRCULATION CONTROL LEVER

BLOWER SPEED CONTROL LEVER

The blower speed control lever operates blower motor at one of 4 speeds. (Scheme 3)

TEMPERATURE CONTROL LEVER

When temperature control lever is moved to full hot position, air mix door opens fully, allowing all airflow through heater core to selected outlets. (Scheme 4) In full cold position, air mix door closes off airflow through heater core. Adjusting air temperature control lever allows more or less air to by-pass heater core.

Scheme 4

Scheme 4: TEMPERATURE CONTROL LEVER
Scheme 4: TEMPERATURE CONTROL LEVER

TEMPERATURE CONTROL CABLE

Disconnect temperature control cable from clip and door at heater case. Set temperature lever to full cold position. At heater case, push door lever fully forward (clockwise) and attach cable with cable clip. (Scheme 5) Check temperature knob for smooth operation and ensure that it stops in correct spots.

MODE CONTROL CABLE

Disconnect mode control cable from clip and door at heater case. Set mode lever to vent position. At heater case, push door lever fully forward (clockwise) and attach cable with cable clip. (Scheme 5) Check mode lever for smooth operation and ensure that it stops in correct spots.

FRESH/RECIRCULATED AIR CONTROL CABLE

Disconnect fresh/recirculated air control cable from clip and door at blower case. Set fresh/recirculation control lever to recirculation position. At blower case, push door lever fully rearward (clockwise) and attach cable with cable clip. (Scheme 5) Check fresh/recirculation control lever for smooth operation and ensure that it stops in correct spots.

Scheme 5

Scheme 5: FRESH/RECIRCULATED AIR CONTROL CABLE
Scheme 5: FRESH/RECIRCULATED AIR CONTROL CABLE

1999-00 Models

  1. Move blower speed selector switch to low position. Using a test light, backprobe blower speed selector switch connector between ground and terminal No. 3 (Pink/Black wire).
  2. If test light comes on, replace blower speed selector switch. If test light does not come on, use a test light to backprobe blower motor resistor connector between ground and terminal No. 4 (Pink/Black wire). If test light comes on, repair open Pink/Black wire between blower speed selector switch and blower motor resistor. If test light does not come on, replace blower motor resistor.
  1. Move blower speed selector switch to medium-low position. Using a test light, backprobe blower speed selector switch connector between terminal No. 4 (Pink/Blue wire) and ground.
  2. If test light comes on, replace blower speed selector switch. If test light does not come on, use a test light to backprobe blower motor resistor connector between ground and terminal No. 5 (Pink/Blue wire). If test light comes on, repair open Pink/Blue wire between blower speed selector switch and blower motor resistor. If test light does not come on, replace blower motor resistor.
  1. Move blower speed selector switch to medium-high position. Using a test light, backprobe blower speed selector switch connector between ground and terminal No. 5 (Pink/Green wire).
  2. If test light comes on, replace blower speed selector switch. If test light does not come on, use a test light to backprobe blower motor resistor connector between ground and terminal No. 1 (Pink/Green wire). If test light comes on, repair open Pink/Green wire between blower speed selector switch and blower motor resistor. If test light does not come on, replace blower motor resistor.
  1. Move blower speed selector switch to high position. Using a test light, backprobe blower speed selector switch connector between ground and terminal No. 2 (Pink wire).
  2. If test light comes on, replace blower speed selector switch. If test light does not come on, repair open in Pink wire between blower speed selector switch and blower motor.
  1. Move blower speed selector switch to OFF position. Using a test light, backprobe blower motor resistor connector between ground and terminal No. 3 (Pink wire).
  2. If test light does not come on, repair open in Pink wire between blower motor resistor and splice connection located about 6" from blower motor resistor harness connector. If test light comes on, replace blower speed selector switch. If test light comes on, replace blower motor resistor.
  1. Turn ignition on. Set blower speed selector switch to OFF position. Using a test light, backprobe blower motor connector between terminal No. 1 (Blue/White wire) and ground. If test light comes on, go to step 6 . If test light does not come on, go to next step.
  2. Using a test light, backprobe blower motor relay connector terminal No. 5 (Blue/White wire). If test light comes on, repair open circuit in Blue/White wire between blower motor and blower motor relay. See «WIRING DIAGRAMS»(ref-97177-S09610112362001042600000) . If test light does not come on, go to next step.
  3. Using a test light, backprobe blower motor relay connector terminal No. 4 (Light Green wire). If test light comes on, go to next step. If test light does not come on, repair open circuit in Light Green wire between blower motor relay and BLOWER fuse (30-amp), or in Red wire between BLOWER fuse (30-amp) and HTR fuse (60-amp).
  4. Turn ignition on. Set blower speed selector switch to OFF position. Using a test light, probe blower motor relay connector between terminal No. 1 (Yellow/Green wire) and ground. If test light comes on, go to next step. If test light does not come on, repair open circuit in Yellow/Green wire between blower motor relay and DEF fuse (15-amp). See «WIRING DIAGRAMS»(ref-97177-S09610112362001042600000) .
  5. Using DVOM, check for continuity between blower motor relay terminal No. 3 (Black wire) and ground. If continuity exists, replace blower motor relay. If continuity does not exist, repair open circuit in Black wire between blower motor relay and ground.
  6. Turn ignition off. Set blower speed switch to HIGH position. Using DVOM, check for continuity between blower motor terminal No. 2 and ground. If continuity exists, replace blower motor. If continuity does not exist, go to next step.
  7. Using DVOM, check continuity of Pink wire between blower motor terminal No. 2 and blower motor resistor terminal No. 3. If continuity exists, go to next step. If continuity does not exist, repair open circuit in Pink wire between blower motor terminal No. 2 and splice connection located about 6" from blower motor resistor harness connector. See «WIRING DIAGRAMS»(ref-97177-S09610112362001042600000) .
  8. Turn ignition off. Set blower speed switch to HIGH position. Disconnect blower speed switch harness connector. Using DVOM, check for continuity between blower speed switch terminals No. 1 (Black wire) and No. 2 (Pink wire). If continuity exists, repair open circuit in Black wire between blower speed switch terminal No. 1 and ground. If continuity does not exist, replace blower speed switch.

2001 Models

  1. Disconnect blower motor connector. Using test light, connect between blower motor harness connector terminals No. 1 and 2. Turn ignition on. Turn blower speed switch to any position except OFF. If test light comes on, go to step 7 . If test light does not come on, go to next step.
  2. Turn blower speed switch off. Connect test light between blower motor harness connector terminal No. 1 (Blue/White wire) and ground. If test light comes on, go to step 4 . If test light does not come on, go to next step.
  3. Check for faults in following circuits and components: Open circuit in Blue/White wire between blower motor and blower motor relay. Open circuit in Light Green wire between blower motor relay and BLOWER fuse (30-amp). Open circuit in Red wire between blower fuse (30-amp) and HTR fuse (60-amp). Open circuit in Yellow/Green wire between DEF fuse (15-amp) and blower motor relay. Open circuit in Black wire between blower motor relay and ground. Faulty blower motor relay. See «WIRING DIAGRAMS»(ref-97177-S09610112362001042600000) . Repair as necessary and retest system.
  4. Using DVOM, check continuity of Pink wire between blower motor harness connector terminal No. 2 and splice connection located about 6" from blower motor resistor harness connector. If continuity exists, go to next step. If continuity does not exist, repair open circuit in Pink wire.
  5. Using DVOM, check continuity of Black wire between blower speed switch harness connector terminal No. 1 and ground. See «WIRING DIAGRAMS»(ref-97177-S09610112362001042600000) . If continuity exists, go to next step. If continuity does not exist, repair open circuit in Black wire between blower speed switch harness connector terminal No. 1 and ground.
  6. Using DVOM, check continuity of blower speed switch between terminal No. 1 (Black wire) and appropriate terminals in each speed position. See «WIRING DIAGRAMS»(ref-97177-S09610112362001042600000) . If continuity does not exist on any circuit, replace blower speed switch.
  7. Check for loose or corroded connection at blower motor connector. Repair as necessary. If no problem was found, replace blower motor. See «BLOWER MOTOR & CASE»(ref-97177-S11380270592001042600000) under REMOVAL & INSTALLATION.
  8. Check for loose or corroded connection at blower motor relay. Repair as necessary. If no problem was found, replace blower motor relay.

BLOWER MOTOR OPERATES IN OFF POSITION

  1. Disconnect blower speed selector switch connector. If blower motor stops, replace blower speed selector switch. If blower motor does not stop, disconnect blower motor resistor connector.
  2. If blower motor stops, repair short to voltage in Pink/Black wire, Pink/Blue wire, or Pink/Green wire between blower speed selector switch and blower motor resistor.
  3. If blower motor does not stop, repair short to voltage in Pink wire between blower speed selector switch, blower motor resistor, and blower motor.

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