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Heater System: Other Chevrolet Metro I

Heater 4 illustrations ~1937 words

Ventilation

Airflow is discharged from the upper instrument panel outlets.

Bi-Level

Airflow is discharged from upper instrument panel outlets and floor outlets. Airflow from floor outlets is warmer than airflow from upper instrument panel outlets.

Defrost

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

Most of the of airflow is discharged from floor outlets, with a small amount being delivered to windshield defrost outlets.

Heat/Defrost

A portion of the airflow is delivered to floor outlets and side window outlets, with the remaining air being delivered to the windshield defrost outlets.

FRESH/RECIRCULATED AIR CONTROL LEVER

The fresh/recirculated air control lever mechanically operates a cable which opens or closes the fresh/recirculated air mode door to fresh (outside) air. When fresh/recirculated air lever is set to fresh, outside air is delivered to vehicle interior. With lever in fresh air mode, as vehicle speed increases, airflow through system increases.

When lever is in recirculated air position, outside air is shut off and air from inside passenger compartment is recirculated through the blower motor to selected air outlets. (Scheme 1)and (Scheme 2). Vehicle is equipped with full time outside air, a small amount of air enters passenger compartment in all modes of operation.

Scheme 1

Scheme 1: FRESH/RECIRCULATED AIR CONTROL LEVER
Scheme 1: FRESH/RECIRCULATED AIR CONTROL LEVER

Scheme 2

Scheme 2
Scheme 2

BLOWER SPEED SELECTOR SWITCH

The blower speed selector switch operates blower motor at one of 5 speeds: OFF, low, medium-low (M1), medium-high (M2) and high.

TEMPERATURE CONTROL LEVER

When temperature control lever is moved to full hot position, the air mix door opens fully, allowing all airflow through heater core to selected outlets. (Scheme 2) In full cold position, the air mix door closes off airflow through heater core. Adjusting the air temperature control lever allows regulation of temperature by allowing more or less air to by-pass heater core.

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 (counterclockwise) and attach cable with cable clip. (Scheme 3) Check temperature lever 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 (counterclockwise) and attach cable with cable clip. (Scheme 3) 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/recirculated air lever to recirculated air position. At blower case, push door lever fully rearward (counterclockwise) and attach cable with cable clip. (Scheme 3) Check fresh/recirculated air lever for smooth operation and ensure that it stops in correct spots.

Scheme 3

Scheme 3: FRESH/RECIRCULATED AIR CONTROL CABLE
Scheme 3: FRESH/RECIRCULATED AIR CONTROL CABLE

BLOWER CONTROL SYSTEM CHECK

Turn ignition switch to ON position. Move blower speed selector switch from low to high positions and listen for increase in blower motor speed at each switch position. Move blower speed selector switch from high to low positions and listen for decrease in blower motor speed. If blower motor is inoperative in any or all speeds, go to appropriate diagnostic procedure.

BLOWER MOTOR INOPERATIVE ANY SPEED

  1. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000). Go to next step.
  2. Turn ignition switch to ON position. Using a test light connected to ground, backprobe blower speed selector switch between terminal No. 1 (Black wire; Light Green wire after connector C211). (Scheme 4) If test light comes on, go to step 5. If test light does not come on, go to next step.
  3. Check for open in Light Green wire (Black wire after connector C211) between junction block and blower speed selector switch. If wires are okay, go to next step. If circuit fault was found, go to step 11.
  4. Replace junction block. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  5. Move blower speed selector switch to high position. Using a test light connected to ground, backprobe blower motor connector between terminal No. 2 (Pink wire). If test light comes on, go to step 8. If test light does not come on, go to next step.
  6. Check for open in Pink wire. If wire is okay, go to next step. If circuit is faulty, go to step 11.
  7. Replace blower speed selector switch. See «BLOWER SPEED SELECTOR SWITCH»(ref-244-S05800153932000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  8. Backprobe blower motor connector between terminal No. 1 (Black wire; Light Green wire after connector C211) and battery voltage. If test light does not come on, go to step 10. If test light comes on, go to next step.
  9. Repair open in Black wire between blower motor and ground. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  10. Replace blower motor. See «BLOWER MOTOR & FAN»(ref-244-S03644961582000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  11. Repair open in suspect circuit. See «WIRING DIAGRAMS»(ref-244-S32607614142000030800000). Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).

Scheme 4

Scheme 4
Scheme 4

BLOWER MOTOR OPERATES ONLY IN HIGH POSITION

  1. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000). Go to next step.
  2. Turn ignition switch to ON position. Move blower speed selector switch to low position. Using a test light connected to ground, backprobe blower motor resistor connector between terminal No. 4 (Pink/Black wire). See «WIRING DIAGRAMS»(ref-244-S32607614142000030800000). If test light comes on, go to next step. If test light does not come on, go to step 6.
  3. Check for an open Pink/Black wire between blower motor resistor and splice S233. (Scheme 4) If wire is okay, go to step 5. If wire is not okay, go to next step.
  4. Repair open in Pink/Black wire between blower motor resistor and splice S233. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  5. Replace blower motor resistor. See «BLOWER MOTOR RESISTOR»(ref-244-S08599246302000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  6. Replace blower speed selector switch. See «BLOWER SPEED SELECTOR SWITCH»(ref-244-S05800153932000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).

BLOWER MOTOR DOES NOT OPERATE IN HIGH POSITION

  1. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000). Go to next step.
  2. Turn ignition switch to ON position. Move blower speed selector switch to high position. Using a test light connected to ground, backprobe blower speed selector switch connector between terminal No. 3 (Blue wire; Pink wire after connector C211) and ground. (Scheme 4) If test light comes on, go to next step. If test light does not come on, go to step 4.
  3. Repair open circuit between blower speed selector switch terminal No. 3 (Blue wire; Pink wire after connector C211) and splice S232 in Pink wire to blower motor. (Scheme 4) Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  4. Replace blower speed selector switch. See «BLOWER SPEED SELECTOR SWITCH»(ref-244-S05800153932000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).

BLOWER MOTOR DOES NOT OPERATE IN MEDIUM-HIGH (M2) POSITION

  1. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000). Go to next step.
  2. Turn ignition switch to ON position. Move blower speed selector switch to medium-high (M2) position. Using a test light, backprobe blower speed selector switch connector between terminal No. 6 (Red/Blue wire; Pink/Blue wire after connector C211) and ground. (Scheme 4) If test light comes on, go to next step. If test light does not come on, go to step 6.
  3. Check for open in Red/Blue wire (Pink/Blue wire after connector C211) between blower speed selector switch and blower motor resistor. See «WIRING DIAGRAMS»(ref-244-S32607614142000030800000). If wire is okay, go to next step. If wire is not okay, go to step 5.
  4. Repair open in Red/Blue wire (Pink/Blue wire after connector C211) between blower speed selector switch and blower motor resistor. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  5. Replace blower motor resistor. See «BLOWER MOTOR RESISTOR»(ref-244-S08599246302000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  6. Replace blower speed selector switch. See «BLOWER SPEED SELECTOR SWITCH»(ref-244-S05800153932000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).

BLOWER MOTOR DOES NOT OPERATE IN MEDIUM-LOW (M1) POSITION

  1. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000). Go to next step.
  2. Turn ignition switch to ON position. Move blower speed selector switch to medium-low (M1) position. Using a test light, backprobe blower speed selector switch connector between terminal No. 5 (Red/Green wire; Pink/Green wire after connector C211) and ground. (Scheme 4) If test light comes on, go to next step. If test light does not come on, go to step 6.
  3. Check for open in Red/Green wire (Pink/Green wire after connector C211) between blower speed selector switch and blower motor resistor. If wire is okay, go to next step. If wire is not okay, go to step 5.
  4. Repair open in Red/Green wire (Pink/Green wire after connector C211) between blower speed selector switch and blower motor resistor. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  5. Replace blower motor resistor. See «BLOWER MOTOR RESISTOR»(ref-244-S08599246302000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  6. Replace blower speed selector switch. See «BLOWER SPEED SELECTOR SWITCH»(ref-244-S05800153932000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).

BLOWER MOTOR DOES NOT OPERATE IN LOW POSITION

  1. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000). Go to next step.
  2. Turn ignition switch to ON position. Move blower speed selector switch to low position. Using a test light, backprobe blower speed selector switch connector between terminal No. 4 (Red/Black wire; Pink/Black wire after connector C211) and ground. (Scheme 4) If test light comes on, go to next step. If test light does not come on, go to step 6.
  3. Check for open in Red/Black wire (Pink/Black wire after connector C211) between blower speed selector switch and blower motor resistor. See «WIRING DIAGRAMS»(ref-244-S32607614142000030800000). If wire is okay, go to next step. If wire is not okay, go to step 5.
  4. Repair open in Red/Black wire (Pink/Black wire after connector C211) between blower speed selector switch and blower motor resistor. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  5. Replace blower motor resistor. See «BLOWER MOTOR RESISTOR»(ref-244-S08599246302000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).
  6. Replace blower speed selector switch. See «BLOWER SPEED SELECTOR SWITCH»(ref-244-S05800153932000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000).

BLOWER MOTOR OPERATES IN OFF POSITION

  1. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000) . Go to next step.
  2. Turn ignition switch to OFF position. Disconnect blower motor resistor connector. Disconnect blower speed selector switch connector. Turn ignition switch to ON position. If blower motor stops, go to next step. If blower motor does not stop, go to step 4 .
  3. Replace blower speed selector switch. See «BLOWER SPEED SELECTOR SWITCH»(ref-244-S05800153932000030800000) under REMOVAL & INSTALLATION. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000) .
  4. Using a test light, backprobe blower motor connector between terminal No. 2 (Pink wire) and ground. See «WIRING DIAGRAMS»(ref-244-S32607614142000030800000) . If test light comes on, go to next step. If test light does not come on, go to step 6 .
  5. Repair short to voltage in Pink wire (Blue wire after connector C211) between blower motor, blower motor resistor and blower speed selector switch. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000) .
  6. Backprobe blower motor resistor connector with a test light between terminal No. 1 (Pink/Blue wire) and ground. If test light comes on, go to next step. If test light does not come on, go to step 8 .
  7. Repair short to voltage in Pink/Blue (Red/Blue after connector C211) wire between blower motor resistor and blower speed selector switch. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000) .
  8. Backprobe blower motor resistor connector with a test light between terminal No. 3 (Pink/Green wire; Red/Green wire after connector C211) and ground. If test light comes on, go to next step. If test light does not come on, go to step 10 .
  9. Repair short to voltage in Pink/Green (Red/Green after connector C211) wire between blower motor speed selector switch and blower motor resistor. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000) .
  10. Repair short to voltage in Red/Black (Pink/Black after connector C211) wire between blower speed selector switch and blower motor resistor. Perform «BLOWER CONTROL SYSTEM CHECK»(ref-244-S36265124722000030800000) .

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