A/C - Changes for R134a Refrigerant
Models: 1993.5 G20Section: Heater/Air Conditioner
Classification: HA93-001
Bulletin No.: ITB93-001
Date: June 18, 1993
1993.5 G20 A/C CHANGES FOR R-134a REFRIGERANT
APPLIED MODEL:
1993.5 G20 (P10)
SERVICE INFORMATION:
As part of Infiniti's ongoing concern for the environment the A/C system in the 1993.5 G20 is designed for the use of R-134a refrigerant. This new refrigerant does not deplete the ozone in the upper atmosphere.
Infiniti Technical Service Bulletin ITB92-013 (HA92-002) entitled "A/C System Changes for R-134a Refrigerant" includes general information about R-134a A/C systems. This bulletin describes the specific details of the 1993.5 G20 R-134a A/C system. Use this bulletin together with 1TB92-013 (HA92-002) for complete information regarding G20 R-134a A/C systems.
IMPORTANT POINTS:
(refer to this bulletin for details).
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^ For both manual transmission (M/T) and automatic transmission (A/T) G20 vehicles, the electric cooling fans have changed to improve heat exchange and fan motor durability.
^ For the manual transmission (M/T) G20, the radiator has been changed. The new (R-134a) radiator has increased cooling fan density.
^ When diagnosing a customer complaint of poor A/C performance or engine overheating, use of the information shown on pages 2/4 and 3/4, along with the parts catalog, to confirm that the correct cooling fan(s) and radiator (M/T model) are applied.
^ The refrigerant charge specification for the G20 R-134a A/C system is different from the G20 R-12 A/C system specification.
^ The R-134a systems have no sight glass because R-134a and the PAG lubricants do not exhibit "clear sight glass" characteristics, even when properly charged.
^ The 1993.5 G20 R-134a system uses Nissan A/C System Oil Type R, part number KLHOO-PAGRO.
^ When charging R-134a systems, use the ACR4 (J-39500) to ensure accurate charging (to .01 lb.).
^ If an R-134a system is suspected to be low on refrigerant charge. first perform a system leak check using the R-134a leak detector (J-39400). After repairing any leaks found, charge the system using the ACR4 equipment.
^ The information shown on the following pages shows the details of the differences between R-12 and R-134a A/C systems for the G20 model.
COMPONENT IDENTIFICATION
^ The components are changed for R-134a and identified as indicated:
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GENERAL PRECAUTIONS:
^ R-12 refrigerant and R-134a refrigerant must never be mixed, even in the smallest amounts, as they are incompatible with each other. If the refrigerants are mixed, compressor failure is likely to occur.
^ Use only Nissan A/C System Oil Type R for the G20 R-134a A/C system and the G20 R-134a components. If other lubricant(s) is used, compressor failure is likely to occur.
^ The R-134a lubricant absorbs moisture from the atmosphere at a rapid rate, therefore the following handling precautions must be observed:
^ When removing refrigerant components from the vehicle, immediately cap (seal) the component to minimize the entry of moisture from the atmosphere.
^ When installing refrigerant components to a vehicle. do not remove the caps (unseal) until just before connecting the components. Also, complete the connection of all refrigerant loop components without delay to minimize the entry of moisture into the system.
^ Use only the specified lubricant from a sealed container only. Containers must be resealed immediately after dispensing the lubricant. Lubricant in containers which are not sealed properly will become moisture saturated, and should be properly disposed of.
^ Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and throat. To remove R-134a from the A/C system, use the service equipment certified to meet the requirements of SAE J2210 (R-134a) recycling equipment.
^ If accidental system discharge occurs, ventilate the work area before resuming service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.
^ Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or air conditioning system.
^ Do not introduce compressed air to any refrigerant container or refrigerant component, because contamination will occur.
^ R-134a in the presence of oxygen and under pressure may form a combustible mixture. Therefore, never introduce compressed air into any R-134a container, cylinder, A/C component, recover/recycle equipment, or any other service equipment. This includes "empty" containers.
WARRANTY INFORMATION
For "Evacuate/Recharge" operations involving R134a charged A/C/systems, OP Code TB777A must be used, instead of the more familiar R-12 OP Code TB888A.