What should the high and low side pressures be for r134a?
R134a Pressure Gauge Chart
| Ambient Temperature (°F) | Low Side | High Side |
|---|---|---|
| 90° | 50-55 psi | 250-275 psi |
| 85° | 50-55 psi | 220-250 psi |
| 80° | 45-50 psi | 175-220 psi |
| 75° | 40-45 psi | 150-175 psi |
What should AC pressure be with engine on?
Q: What are normal pressures for 134a? Few ask what is the correct ac pressure on a car for 134a. The best running pressure for R134A is found between 22 and 57 in this type of system.
What should AC low side high side low pressure be?
On the other hand, there is possibly a huge leak when the pressure is zero. AC Low Side High, High Side Low: Why Does This Happen? The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi.
Why is my engine pressure on the high side?
Now, when the engine is on and running, and the pressure gauge still reads a high pressure on the high side while the low side pressure keeps dropping, it should be clear that the underlying issue has to do with the condenser. More specifically, there is restricted air flow in the condenser due to blockage.
Where is the low side high side low pressure switch?
The switch is located near the expansion valve. Use an Ohmmeter to find if it is giving the correct reading. Also, check if the compressor clutch engages and rotates the compressor when the AC is on. Similarly, the fan also has to spin when you turn the system on.
What causes high side pressures in AC system?
Also double check your fan is running, if your fan fails your pressures will skyrocket. If not your expansion valve, it could be your heater is stuck open and running hot coolant through your evap coil at the same time. Last edited by CanadianTRD; 07-11-2012 at 08:52 PM.