Evaporators

Motorcycle Most evaporators will work fine with HFC-134a after being fitted with an expansion valve calibrated for the new refrigerant.
They work well because, regardless of claims to the contrary, HFC-134a is a more efficient refrigerant, heat transfer is better and exiting air temperature from the HFC-134a systems is often colder than CFC-12 systems.
On the other hand, this efficiency can be a problem if you have a pressure-valve controlled system. Such systems include older (1960’s) G.M.,Ford, and Chrysler OE units. Because the system is controlled by low side pressure and HFC-134a produces lower low-side pressures at a given temperature, these old systems will regulate the refrigerant at CFC-12 levels and above optimal low-side pressures for HFC-134a.Higher vent temperatures result and this may not be acceptable in some climate and humidity conditions.

Compressors

ATV The compatibility of your compressor is application-specific and upgrading to a modern Sanden type compressor is highly recommended because of reliability and smooth operation. Vintage Air has always used Sanden compressors because they are a superior product and well proven and adaptable to the HFC-134a refrigerant. If you are upgrading an older Vintage Air system, check with us on date codes to make sure, but most Sanden compressors need only to be drained and refilled with the PAG oil lubricant. In most cases, Vintage Air systems will require the new PAG oil, new drier with the XH-9 desiccant, a couple of new access ports, and verification that the other components are compatible as described above and you are ready to charge with HFC-134a refrigerant.

Condensors

Motorcycle The most difficult problem is getting a condenser large enough, in a place where the air is cool enough, and can flow across it well enough to remove the heat and condense the refrigerant adequately. The condenser has to provide a low resistance path for the condensed liquid to flow so pressure build up can be avoided on the existing refrigerant.
Pressure here tends togood thing for hot rods! A condenser has to have good air flow and must be mounted properly. It must be matched to a compressor of approximately nine (9) cubic inches or slightly less, using a standard aftermarket evaporator.

Driers

ATV The drier desiccant (water remover) for HFC-134a is different than that used in CFC-12 systems. It must be replaced.
If the new drier is not marked for refrigerant type, don’t buy it!

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Control Panels

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Louvers

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