K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
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PAG oil used for future service if needed (mark PAG on box on label, Figure 6).
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HR6 or R4 original compressor RETAINED - add 8 oz FAG oil to system
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V5 original compressor RETAINED - add 9 oz V5 Retrofit oil to system. If V5 Retrofit oil is not available from GMSPO, REPLACE
THE COMPRESSOR.
c.
Based on the above chart, add oil if needed. Use the new oil bottle and the extended tube kit, J 39500-71. Fill the bottle with at least 10 oz
of oil. Attach the new bottle to the back of the ACR4, and open the oil fill valve. Allow the correct amount of oil to be drawn into the
system. DO NOT allow the oil level to drop below the end of the pickup tube. This will prevent any air from being drawn into the system. If
any oil was removed during the R-12 recovery evacuation steps, DO NOT add additional oil to replace it.
d.
Determine the correct amount of R-134a to use. Check the existing label of the vehicle for the R-12 charge amount.
Use the formula {(R12 x .9) - .25 lb = R-134a} to determine the correct charge. This can also be stated as: Take 90% of the R12 charge, and
subtract 1/4 lb.
Follow the directions for the ACR4 cart to recharge the system. At the end of the process, "CPL" will be displayed. Close the high side
valve.
e.
Start the vehicle, turn on the A/C system, and confirm that pressures are within normal operating ranges, as shown in the 1994 Service
Manual. The 1994 Service Manuals can be used as a reference for diagnosis and specification of retrofitted systems.
On some vehicles with automatic A/C controls or low charge diagnostics, the A/C compressor may not engage if any diagnostic codes were
set during the retrofit. Check to see if any codes were set in either the HVAC or Engine Control systems. If they were, clear the codes
following the directions in the Service Manual.
