Chevrolet Camaro 12000 1968 Series Factory Assembly Instruction Manual page 227

ASSEMBLY INSTRUCTIONS
3918855
Evacuating and Charging the System
1 9 6 8 C A M A R O 1 2 0 0 0 SERIES
1. Remove cap fro'm Muffler and S.T. V. Valves.
2. Attach Process Coupler Yoke Assembly to process valves uncapped in Step 1.
3. Attach quick-connect fitting from vacuum system to Process Coupler and open valves slowly to
evacuate Air Conditioning System.
7) 4. Air conditioning system must be evacuated to a minimum of 25 mm Hg. absolute system pressure (1).
After a 15-second hold'time (2), tne system pressure must not exceed 28 mm Hg. absolute pressure,
(1) System Pressure - the level of evacuation of the vehicle's A/C system once the vacuum source
has been removed.
(2) Hold Time - elapsed time which occurs between vacuum disconnect and charge connect.
For those plants which have a longer than 15-second hold time, the system pressure may be allowed
to rise to the values shown below in Table #1.
Elapsed Time Between
Evacuation and Charge
15-30 seconds
31-60 seconds
61-90 seconds
91 seconds and over
TABLE #1
Acceptable Evacuation Level (mm Hg)
per Evacuation and Charge Spec.
28 mm Hg
30 mm Hg
35mmHg
40 mm Hg
5«. Disconnect quick-connect fitting from vacuum system to Process Coupler and attach quick-connect
fitting from Refrigerant Charging Board to Process Coupler.
6. Charge Air Conditioning System with specified amount of Refrigerant.
7. Close valves on Process Coupler, disconnect quick-connect fitting from Charging Board to Process
Coupler, disconnect Process Coupler from Manifold and S.T. V. valve and replace caps.
8. Leak Test System.
9. Conduct Functional Test.
System Leak Test Limits
1. Except as noted in (2) below, all lines, connectors, and system components shall be free of leakage
with a detector sensitivity calibration of 1 lb. in 40 years.
2. The compressor seal, sight glass, and S.T. V. valve shall show no leakage with a detector sensitivity
calibration of 1 lb. in 5 years.
Functional Test
A standard test of the function of the system is to be conducted in the following manner:
1. Doors or windows open.
2. "Outlets" knob at full left position. "Temp" knob at "COLD" (Full outside air) position.
tf
DEFR" knob
at "OFF" position.
3. Temperature indicators at condenser inlet and center outlet,
4. Start engine and run at 2000 R.P.II.
5. After one minute the minimum drop in temperature of the air from the center outlet should be as follows:
CONDENSER INLET TEMP.
CENTER OUTLET TEMP. DROP (MIN.)
70° F
20° F
80° F
25° F
90° -110
30° F
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