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Refrigerant System Charging

  1. Correctly oil match system to verify correct amount of refrigerant oil is present in system. See SPECIFICATIONS in appropriate MANUAL A/C HEATER SYSTEMS or AUTOMATIC A/C HEATER SYSTEMS article.
  2. Charge system with specified amounts of refrigerant oil and refrigerant. See SPECIFICATIONS in appropriate MANUAL A/C HEATER SYSTEMS or AUTOMATIC A/C HEATER SYSTEMS article.
  3. When no more refrigerant is being drawn into system, start engine and select MAX A/C operation. Adjust blower motor speed to maximum and allow remaining refrigerant to be drawn into system. Continue to add refrigerant into system until specified weight of R-134a has been added. Close charging cylinder valve and allow system to pull any remaining refrigerant from hose. When low pressure drops to about 30 psi (207 kPa), close charging hose valve.
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