GMC chervolet camaro 1999 Service Manual page 110

HVAC HVAC System - Manual 1-19
Functional Check (cont'd)
Step Action
Normal Result(s) Abnormal Result(s)*
1. Place the mode control knob in
• The blower motor speed • Blower motor speed inop.
the DEFROSTER BLEND
is HIGH.
• No airflow from the heater and/or
setting.
• There is airflow from the heater defroster outlets.
2. Place the temperature control outlets.
• .Airflow from the A/C outlets.
knob in the HOT setting.
• There is no airflow from the A/C
•. No engagement of the detent
3. Place the blower motor knob in outlets.
is felt.
8
the HIGH setting.
• There is air flow from the
• No airflow at the side window
defroster outlets.
defogger outlets.
• Engagement of the detent is felt
• Refer to Blower Motor
in each mode control lever
Inoperative at Any Speed,
setting.
Heating Insufficient, Air Delivery
• Air flow is present at the. side
Improper or Temperature Control
window defogger outlets. Inoperative.
1. Place the mode control knob in • The blower motor speed • Blower motor speed inop.
the DEFROST setting.
is HIGH.
• Airflow from the A/C outlets.
2. Place the temperature control
• There is minimum airflow from
• No airflow from the defroster
knob in the HOT setting. the heater outlets.
outlets.
3. Place the blower motor knob in
• There is no airflow from the A/C
• No .engagement of the detent
the HIGH setting. outlets.
is felt.
9
• There is air flow from the
• No airflow at the side window
defroster outlets.
defogger outlets.
• Engagement of the detent is felt
• Refer to Blower Motor
in each mode control fever
Inoperative at Any Speed,
setting.
Heating Insufficient, Air Delivery
• Air flow is present at the side Improper, Temperature Control
window defogger outlets.
Inoperative.
* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.
HVAC Blower Controls System Check
Step Action
Normal Result(s)
Abnormal Result(s)
1. Start the engine.
The blower motor runs in any
• Blower Motor Low Speed
2.
Place the blower switch in
position, except OFF, and increases
Inoperative
in speed as the blower switch is
position 1 (LOW) position.
switched from the LO to the Hf
• Blower Motor Inoperative in One
3. Place the selector switch in the
position.
Speed Only (High Speed
MAX position, the NORM
Operates Normally)
position, the. VENT position, the
• Blower Motor Inoperative at
Bl-LEV position, the H~TER Any Speed
position, the HEAT/DEf
• Blower Motor High Speed
1
position, and the DEF position.
Inoperative
4. Place the selector switch in.the
• Blower Motor Operates at High
VENT position.
Speed Only
5.
Place the blower switch in
position 2.
6. Place the blower switch in
position 3.
7.
Place the blower switch in
position 4 (HIGH) position.
2
Put the selector switch in the OFF The blower motor stops. Blower Motor Always On
position.