Minimum Requirements

R-134a MINIMUM RETROFITTING REQUIREMENTS

NOTE: When available, Original Equipment Manufacturer (OEM) procedures on R-134a retrofitting are found in Technical Service Bulletins (TSB). Always check for TSBs prior to retrofitting, some vehicles can not be retrofitted.

- All traces of the original refrigerant must be removed. Under the provisions of the EPA's Significant New Alternative Policy (SNAP), mixing differing types of refrigerant is prohibited. Separate, dedicated, EPA approved equipment must be used to recover and store the R-12 removed from the system.

NOTE: It is illegal to vent any type of refrigerant to the atmosphere.

- The system should be inspected thoroughly for leaks and deteriorated components. If the system is operational it should also be checked for proper performance. Any deficiencies noted should be corrected prior to retrofitting.

NOTE: Due to the less efficient cooling characteristics of R-134a, a properly charged R-12 system which is performing poorly prior to retrofitting will not produce satisfactory cooling performance after retrofitting.

- Unique R-134a Fittings must be added to all service ports, or the service port must be permanent disabled.

- The original refrigerant service label should be removed and a new R-134a service label should be installed.

- All exising mineral oil should be removed from the system and replaced with either:
- Polyalkaline Glycol (PAG) oil
- Polyol Ester (POE) oil

CAUTION: Always review TSBs for manufacturer specific oil requirements. Some manufacturers require a specific type (PAG or POE).

- If any components are removed, R-134a compatible gaskets and O-rings should be used during installation.

- If A/C hoses are replaced, barrier type hose should be installed.

NOTE: Non-barrier type neoprene hoses may be identified by the thin ribbing running the length of the hose. Non-barrier hoses are often thicker and more flexible than barrier hoses.

- The amount of R-134a charged into the system should normally be 80-90 % of the amount of R-12 required in a fully charged system. Check Technical Service Bulletins (TSB) for specific amounts.

NOTE: Experience has shown that a fully charged R-134a retrofitted system may still exhibit bubbles flowing through the sight glass.