Quality Used & Restored
Classic Car Parts!
Specializing
in 1967-81 Firebird/Trans-Am & Camaro/Z-28
1968-72 Chevelle, El Camino, GTO/LeMans, Skylark/GS & Cutlass/442
1968-74 Nova
Tampa, FL
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CONVERTING TO 134a? To dispel one myth, R12 is NOT illegal! Though it is no longer in production in most countries, Congress has mandated that R12 be available to qualified technicians in reserve & recycled forms until the year 2030. The fact is, there isnt a single shred of evidence that R12 is or has ever been detrimental to the environment! The situation is, however, what it is out with the old & in with the new. How do I convert my R12 system to 134a? Simple enough. Regardless of the type of system you are using, there are some basic rules that accommodate all 134a conversions. 1 Change the oil in the compressor to an oil (PAG or Ester) that is compatible with 134a. 2 Replace the filter-drier (or accumulator or VIR, depending on the type of system being converted) Keep in mind, NOS driers will not be suitable for 134a! 3 Flush all original used components to be re-used to insure against contamination. Though it is not necessary to clean every last drop of oil from the system, contamination is the number one cause of air-conditioning failure. 4 Replace all rubber hoses, using barrier rubber hose. Though your original used hoses may hold in the short-term, they will ultimately leak or burst! A good way to physically check for hose defects is to remove the hose and bend against the natural bow inspect for dry-rotting, splitting, bubbles or holes at stress points. With any of the above, replace or restore. 5 For models using fixed-orifice-tubes, (typically 1977 & newer GM & Ford vehicles) it is highly recommended that you purchase a variable-rate replacement. The cost is significantly higher, (We have them available for $39.99) but worth the money. For all other applications, (typically 1976 & older GM & Ford vehicles) a new expansion valve is NOT required for converting to 134a. Contrary to popular opinion, expansion valves are compatible with both R12 & 134a refrigerants. 6 When converting an R12 system to 134a, charging amounts vary from system to system. A good starting point for charging your freshly converted system is typically about 75-80% 134a of the original R12 charge. You may need to add or subtract a little, depending on your gauge readings & vent temperature. 7 General motors vehicles using a POA valve will need to have them adjusted to by-pass at the proper 134a pressures... typically 20psi. Since this can't be done while charging the system, it will need to be done with the valve off of the car. a/c ac air conditioning cond condenser condensor evaporator evaporater drier dryer hoses manifold muffler expansion valve stv suction throttling valve poa valve compressors compressers mounts brackets crank pulley waterpump pulley VOR valves in receiver accumulator accumulater chevy chevrolet sbc bbc buick olds olsmobile pontiac pont firebird trans-am transam trans am formula esprit camaro camero z28 z-28 z 28 chevelle malibu el camino elcamino monte carlo gto g t o tempest lemans le mans cutlass 442 cutlas f85 f 85 f-85 skylark g-s gs g s special nova apollo chevy ii omega ventura 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 |
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