GMC chervolet camaro 1999 Service Manual page 109

1-18 HVAC System - Manual HVAC
Functional Check (cont'd)
Step Action Normal Result(s) Abnormal Result(s)*
1. Place the mode control knob in • The blower motor speed • There is airflow from the heater
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 A/C
knob in the COLD setting. heater outlets. outlets.
3. Place the blower motor knob in
• There is airflow from the A/C • Temperature does not change.
the HIGH setting. outlets.
• No blower motor speed change.
4
• There is no air flow from the
• Refer to Cooling Insufficient -
defroster outlets.
AIC 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 in • The blower motor speed • Blower motor speed inop.
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 in
• There is airflow from the A/C
is felt.
5
the HIGH setting. 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 in
• The blower motor speed • Blower motor speed inop.
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 in • There
is
.airflow from the A/C
• No engagement of the detent
6
the HIGH setting. 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.
1. Place the mode control knob in
• The blower motor speed • Blower motor speed inop.
the HEATER setting. is HIGH.
• Airflow from the heater, defroster
2. Place the temperature control • There is airflow from the heater and A/C outlets.
knob in the HOT setting. outlets.
• No engagement of the detent
3. Place the blower motor knob in • There is no airflow from the A/C is felt.
the HIGH setting. outlets.
• Refer to Blower Motor
• There is minimum air flow from Inoperative at Any Speed,
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the defroster outlets.
Cooling Insufficient - A/C
• Engagement of the detent is felt
Inoperative, Air Delivery
in each mode control lever
Improper or Temperature Control
setting.
Inoperative.
• The temperature lever travels
from full COLD to full HOT.
• Air flow is present at the side
window defogger outlets.
(