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What should r134a pressures be. The **R134A air conditioner pressure chart** is a precise instrument that maps out the pressure and temperature readings for the ... This chart shows the pressure/temp relationship for R-12 and R-134a. Look up the ambient temp and it will show you the pressure you'll see in the system. Note ... °C. R12. R134a. R406A. R409A. R413A. SP34E. R22. R407C. R410A. R417A. R404A. R507. R408A. R403B. R502. R717. -60. -77. -63. -36. -54. -47. -35. -51. Here is an R12 chart for psi & dF. Shoot for at or slightly above 32dF refrigerant or 30-32 psi low side for the evaporator to deliver 36-40 dF air. -50. 10.4. 13.6. 7.3. 12.1. 8.4. 12.8. 7.1 11.7. -45. 8.2. 11.8. 4.6. 10.1. 6.0. 10.9. 4.5. 9.6. -40. 5.9. 9.7. 1.7. 8.0. 3.3. 8.7. 1.6. 7.3. -35. I would like to see a little higher on both the high and low readings. I would be adding more refrigerant and tweak it to @ High side 175psi and low side ... Note: The most ideal pressure readings are around 150 high and 30 low. Warning: Remember, venting 134a refrigerant into our atmosphere is ... Does anyone have the chart from the service manual or at least the low/high side a/c pressure ranges for the different ambient temps? AC System Diagnostics - Operating Pressures R134A. HOW TO PROCEED. FOR PROPER DIAGNOSTICS,. FOLLOW THE STEPS BELOW. R134A OPERATING PRESSURES TABLE. HOW TO READ ... Most technicians in the HVAC field know the normal range of operation for the low-pressure side of an air conditioning system.