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The crossover point is approximately at 64F. He started writing automotive articles to share his garage experience with car enthusiasts and armature mechanics. The exact amount will vary with each car. The global warming potential measures the amount of heat trapped by any gas compared to the amount of heat trapped by the same amount of carbon dioxide. R12 Expansion Valve = 201 830 06 84 R134A Expansion Valve = 201 830 04 84 Is there a difference after all? I have some experience with auto a/c but not too much. Just had knee surgery yesterday, so I"M not exactly hopping around too well. Heres some important advice Whenever you notice your R12 refrigerant is leaking, turn off all flames and open the doors so it can escape to the open atmosphere. The analysis focuses on Coefficient of Performance for . R12 and R134 are of different chemistry. 4) Inconsistent Airflow. A/C R12 to R134a Conversion Success | IH8MUD Forum Break out the new gauges and measure hi and lo at 1500rpm, and do the Merc FSM test to see how we're doing performance wise. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a, Bohica, You say the drop in performance is not linear with too much oil. . R1234yf is more environmentally friendly and has a global warming potential of 4. 34 in 70 series w/ R12 in 100+ Tucson, AZ summer heat w/ hd-t, w/ 13B-T is was unbearable about 31 at vent w/ R12. Blows pretty hard on full. difference between r12 and r134a expansion valve I had a pair on my SAAB that seemed ok - but new ones ran 20% faster!Your best clue to airflow issues is a 60 mph test. It would make a big difference at idle ,in traffic!! But some types of PAG do not mix well with the old residual R12 mineral oil left in the system components whereas ester does mix very well. R-401b is the mixture by weight of 61% R22, 11% R-152a and 28% of R-124. Concentration level: The R134a vapor dilutes the oxygen concentration in the air to a low level, thereby causing harm. sparkee said: Thanks for the Service Bulletin. Instead of using R12, its preferable to use R134a because it is very easy to find in the market, its sold at an affordable price, and is environmentally friendly. I have the original (R12) style expansion valve in the Maverick AC system. This can be very very expensive. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. All fans must work at 100% of the OEM rating. AFAIK, there is no clutch on the engine fan on the 240D. The original rubber a/c hose lines in your car will leak out R12 through the hoses lining. The Wikipedia explanation for expansions valves cited in Frank's thread says that the gas inside the bulb in the metering valve is the same as the refrigerant in the system. Since you will be using less R134a than R12 you do not want to rely on the driers site glass to determine if the system is full. Have a look in the FAQ Section, and look for "Fan clutches & testing them". 2) Frost on the Vents. The MB chart shows 360 psi with R12 in some conditions. They plug all the time. Also, since R134a uses synthetic oil, it has a low global warming potential, unlike R12 which uses mineral oil which poses a negative environmental impact.