Why does my AC have no pressure?
The two most common causes of low head pressure at an air conditioner or heat pump compressor motor are: Refrigerant under-charge, due to a refrigerant leak or improper charge. TXV (TEV) malfunction, over-metering refrigerant.
What happens when you over charge an AC compressor?
If the AC system is overcharged, the change from liquid to gas cannot happen, so the compressor starts producing liquid coolant instead of gas. It now has to work extremely hard to pump the excess coolant through the lines. The result is a noisy or broken compressor.
What does a PSI reading on an A / C compressor mean?
Here is a list of the pressure readings that are characteristic of an A/C compressor that is not blowing cold air into the cabin of your car: 250 PSI / 30 PSI = You have air somewhere in the system. 250 PSI / 50 PSI = The system is overcharged and the condenser is not cooling. Condenser may be blocked.
What’s the minimum static pressure I need for the compressor?
Static pressure is used to determine if a jug of refrigerant is contaminated with air. Static pressure can also be used to determine if a system has enough pressure to begin leak testing. Your static pressure should be no lower than 50 psi when leak testing. What’s the minimum static pressure I need for the compressor to operate?
What should the pressure be on an AC charger?
After determining the correct pressures using the ambient air pressure chart, monitor the pressure readings constantly while charging the system. If the system was low, your AC compressor clutch will not engage. You should notice that as the low-side pressure reaches approx. 25-30PSI, that the compressor clutch will engage.
What should my AC pressure be with the compressor off?
That’s normal with the compressor off. Then watch the pressures when you turn it on. The low side will drop to 25-40psi, and high side should go to around 150-200psi.