Refrigerant

Temperature/pressure relationship
In a partially charged refrigerant container, refrigerant gas comes to the surface, which under particle formation becomes fluid. This occurs under pressure and is know as gas pressure. Similar to R-12 refrigerant, the gas pressure of R-134a is temperature dependent.

Temperature in 5C (5F) Pressure in bar (psi)
-30(-22) 0.0(0.0)
-20(-4) 0.3(4.4)
-10(14) 1.0(14.5)
0(32) 1.9(27.5)
10(50) 3.1(45.0)
20(68) 4.7(68.2)
30(86) 6.7(97.2)
40(104) 9.1(132.0)
50(122) 12.2(177.0)
60(140) 15.8(229.2)
70(158) 20.2(293.0)

WARNING! Paint repairs on vehicles with A/C:
- While performing body/paint repairs involving the use of preheating or drying ovens, do not expose any component of the A/C system to temperatures above 80 °C/176 °F.
- Excessive heat will cause a pressure increase which could burst the system.