GMC chervolet camaro 1999 Service Manual page 168

HVAC
7. Ensure that the retaining ring is seated in the
retaining ring groove in the switch cavity.
8. Evacuate and recharge the system.
9. Perform a leak test. Refer to Compressor Leak
Testing (V5 - Conventional Mount).
Compressor Leak Testing
(VS - Conventional Mount)
• J 39400-A Leak Detector
• J 39500-8 R-134a Air Conditioning Refrigerant
Recovery, Recycling And Recharging System
• J 39893 Pressure Testing Connector
1. With the sealing washers in place, install the
J 39893 on the rear head of the compressor.
2. Connect the gage charging lines and the
J39500-B.
3. Pressurize the suction and the high-side of the
compressor using R-134a refrigerant.
4. With the compressor in a horizontal position,
rotate the compressor shaft several turns by
hand in the operating direction.
5. Using the J 39400-A, inspect for leaks at the
following locations:
5.1. The pressure relief valve
5.2. The rear head switch
5.3. The front head seal
5.4. The rear head seal
5.5. The through bolt head gaskets
5.6. The compressor shaft seal
6. Perform the measures necessary to correct any
external leaks found.
7. Inspect for leaks again following any repair.
8. Recover the refrigerant.
9. Disconnect the hoses from the J 39893.
10. Remove the J 39893.
0-Ring Replacement
Install new GM-approved service replacement air
conditioning 0-rings whenever you service a
A/C connection. Do not install different service
replacement seals when seals are provided with new
parts being replaced. The refrigerant R-134a may
leak if the incorrect seals are used. Refer to the part
number of the 0-ring for identification. Do not rely
on the former color-coating method of 0-ring
identification. Some formerly color-coated service
replacement 0-rings may now be black.
Coat the air conditioning 0-ring seals with the
525 viscosity refrigerant oil before installation. Slip
the seals onto the flange in order to ensure proper
locating and sealing. Do not soak the seals in
refrigerant oil. Soaking the seals in refrigerant oil
may cause the following conditions:
• Swelling of the 0-ring
• Reduction in the sealing effectiveness
Inspect the 0-rings for nicks or deformation before
installation. Replace damaged 0-rings in order
to prevent leakage.
HVAC System - Manual 1-77
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