What should the pressure be on an R-134a AC?
On the high side, R-134a pressures usually run 2.2 to 2.5 times the ambient temperature entering the condenser. So, if the ambient temperature is 80°F, you’ll see high side pressures running between 176-psi and 200-psi. on an R-134a system. At 200-psi. the refrigerant entering the condenser will be around 130°F.
What should the refrigerant level be when the engine is off?
When the engine is off, the readings shouldn’t be close to 0 or over 150 psi. Low readings mean that there is almost no refrigerant, which may be caused by leakage, while high readings suggest that the system is overcharged.
How does the refrigerant gauge work in a car?
This is controlled via sensors through the ECU. The gauge readings will initially be as above; when the vehicle reaches the required temperature the compressor will pump less refrigerant around the system. When less refrigerant is being pumped the pressure on the red gauge will be lower.
How much PSI is on the low side of the R134a?
R134a Pressure Gauge Chart Ambient Temperature (°F) Low Side High Side 110° 50-55 psi 335-345 psi 105° 50-55 psi 325-335 psi 100° 50-55 psi 300-325 psi 95° 50-55 psi 275-300 psi
What is the temperature of the R-134a refrigerant?
R-134a Refrigerant Pressure Temperature Chart °F °C PSI KPA -49 -45 18.4 126.9 -48 -44.4 18 124.1 -47 -43.9 17.6 121.3 -46 -43.3 17.3 119.3
When the engine is off, the readings shouldn’t be close to 0 or over 150 psi. Low readings mean that there is almost no refrigerant, which may be caused by leakage, while high readings suggest that the system is overcharged.
This is controlled via sensors through the ECU. The gauge readings will initially be as above; when the vehicle reaches the required temperature the compressor will pump less refrigerant around the system. When less refrigerant is being pumped the pressure on the red gauge will be lower.