GMC Chevrolet Camaro 1998 Service Manual page 125

HVAC HVAC System - Manual 1-15
Functional Check (cont'd)
Step Action Normal Result(s) Abnormal Result(s)*
1. Place the mode control knob • The blower motor speed is • There is airflow from the heater
in the MAX A/C setting. LOW to HIGH. and/or defroster outlets.
2. Place the temperature control • There is no airflow from the • There is no airflow from the
knob in the COLD setting. heater outlets. A/C outlets.
3. Place the blower motor knob • There is airflow from the • Temperature does not change.
in the LOW to HIGH setting. A/C outlets.
• No blower motor speed change.
• There is no air flow from the
• Blower motor speed inop.
defroster outlets.
• Refer to Cooling Insufficient -
• Temperature from the center
A/C Inoperative, System
A/C outlet should drop 11 °C
Performance Test, Air Delivery
3
(20°F) from the temperature
Improper, Temperature Control
outside the vehicle.
Inoperative or Blower Motor
• A noticeable blower speed Inoperative at Any Speed.
increase occurs from the
following settings:
• LOW
• MEDIUM LOW
• MEDIUM HIGH
• HIGH
• The outlets hold their position
during high blower motor speed
and are moveable by hand.
1. Place the mode control knob • The blower motor speed • There is airflow from the heater
in the NORMAL A/C setting. is HIGH. and/or defroster outlets.
2. Place the temperature control • There is no airflow from the • There is no airflow from the
knob in the COLD setting. heater outlets. A/C outlets.
3. Place the blower motor knob • There is airflow from the A/C • Temperature does not change.
in the HIGH setting. outlets.
• No blower motor speed change.
4
• There is no air flow from the
• Refer to Cooling Insufficient -
defroster outlets.
A/C Inoperative, System
• Listen for a reduction of air Performance Test, Air Delivery
noise due to the recirculation Improper, Temperature Control
door closing. Inoperative or Blower Motor
• Engagement of the detent is felt
Inoperative at Any Speed.
in each mode control setting.
1. Place the mode control knob • The blower motor speed • Blower motor speed inop.
in the Bl-LEVEL A/C setting. is HIGH.
• Airflow from the heater outlets.
2. Place the temperature control • There is airflow from the heater
• No airflow from the A/C outlets.
knob in the COLD setting. outlets.
• No engagement of the detent
3. Place the blower motor knob • There is airflow from the
is felt.
5
in the HIGH setting. A/C outlets.
• Refer to Blower Motor
• There is minimum air flow from
Inoperative at Any Speed,
the defroster outlets.
Cooling Insufficient - A/C
• Engagement of the detent is felt Inoperative, Air Delivery
in each mode control setting. Improper, Temperature Control
Inoperative.
1. Place the mode control knob • The blower motor speed • Blower motor speed inop.
in the VENT setting. is HIGH.
• Airflow from the heater and/or
2. Place the temperature control • There is no airflow from the defroster outlets.
knob in the COLD setting. heater outlets.
• No airflow from the A/C outlets.
3. Place the blower motor knob • There is airflow from the
• No engagement of the detent
6
in the HIGH setting. A/C outlets.
is felt.
• There is no air flow from the
• Refer to Blower Motor
defroster outlets.
Inoperative at Any Speed,
• Engagement of the detent is felt
Cooling Insufficient - A/C
in each mode control lever Inoperative, Air Delivery
setting. Improper or Temperature Control
Inoperative.