300ZX Coupe V6-2960cc DOHC (VG30DE) (1994)
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Comments regarding leak detector use:
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Existing R-12 leak detectors currently will not detect R-134a.
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Many R-134a leak detectors will detect R-12; check with the equipment manufacturer.
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Always refer to and follow the equipment manufacturers recommendations when operating leak detectors.
Comments regarding weight scale use:
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If the scale allows electronic control of the flow of refrigerant through the scale, (i.e. internal solenoid valves) be certain that the hose fitting size is
1/2"-16 ACME, and that no refrigerant other than R-134a (along with only specified lubricant) have been used with the scale.
Charging Cylinder
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The use of a charging cylinder is not recommended because:
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The refrigerant may be vented into the air from the top valve of cylinder when filling the cylinder with refrigerant.
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The accuracy of a charging cylinder is generally less than that of an electronic scale or of quality recycle/recharge equipment.
Service Procedures
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The service procedures for R-134a A/C systems are basically the same as for R-12 A/C systems, however, the following should always be kept in
mind:
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Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose, and throat. Use only approved recovery/recycling
equipment to discharge R-134a systems.
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If accidental system discharge occurs, ventilate the work area before resuming service work.
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R-134a and R-12 A/C components are not interchangeable. Cleaning of used (in service) components for use with another type of refrigerant and/or
lubricant is not an acceptable practice, and may result in A/C system failure.
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Always use the proper PAG oil when servicing an R-134a A/C system. The Nissan part number for the appropriate PAG compressor oil can be found
on the A/C specification label in the engine compartment, and also in the Factory Service Manual, and on the label on the compressor. These oils are
only available from your Nissan Parts Department.
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When leak checking an R-134a system, be certain that you are using a detector which will detect R-134a.
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As mentioned previously in this bulletin, the R-134a PAG lubricants absorb moisture; PAG oil containers and A/C components containing PAG oil
must remain tightly sealed until ready for use.
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Unlike R-12 systems, R-134a systems do not exhibit a "clear sight glass", even when properly charged. For this reason, the R-134a A/C systems have
no sight glass.
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With R-134a systems it is important to properly control the amount of refrigerant charged into the system during system charging. A charging
machine or weight scale must always be used during charging for proper charge determination.
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Questions regarding R-12 or R-134a should be addressed to your Regional Service Staff or the FIXS Hotline.
