GMC chevrolet camaro 2000 Service Manual page 105

1-8 Heating, Ventilation and Air Conditioning HVAC
Cooling Insufficient, A/C System (cont'd)
Step Action Value(s) Yes No
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1. Start the vehicle.
Go to HVAC
2.
Turn the A/C on.
Compressor
2
3. Visually inspect under the hood to see if the
Clutch Does Not
-
Disengage in
A/C compressor clutch is engaged.
HV AC Sys1ems -
Does the A/C compressor clutch engage?
Go to Step 3
Manual
Important: Record the relative humidity and the ambient
temperature AT THE TIME OF THE TEST;
1.
Record the ambient temperature at the vehicle.
2.
Record the relative humidity, using one of the
following methods:
• Use a psychrometer
• Consult the local weather bureau
3. Close the vehicles doors and windows.
4.
Set the HVAC control to the following positions: .
• The A/Con
• The blower control to the highest position
• The HVAC control to discharge air through the
IP outlets
• The temperature control to the coldest position
5.
Install a thermometer into the IP center air .outlet.
6. Apply the park brake.
3
7.
Place the transmission in one of the following
-
positions:
• PARK
• NEUTRAL
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8.
Start the engine and elevate and maintain the engine
RPM to 2000.
9. Run the A/C until the outlet air temperature reaches
the lowest temperature.
This will take approximately 3 minutes.
10.
Record the following information:
• The outlet air temperature
..
• The low-side pressure ..
• The high-side pressure
11. Compare the low and high side pressures and the
output temperature to the table.
Does all the data recorded fall within the specified ranges
of the table below? Go to Step 8 Go to Step 4
Compare the recorded pressures to the A/C System
Go to Cooling
4
Pressure - Zone Classification Graph.
-
Insufficient,
Do both the low and high side pressures fall within Zone A
A!C System -
on the graph? Pressure Zone A Go to Step 5
Do the pressures fall within Zone B? Go to Cooling
5
-
Insufficient,
A/C System -
Pressure Zone B Go to Step 6
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