What should high and low side AC pressures be?

The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. If the ambient temperature is higher or lower than normal (70 to 80°F) the pressures will go up or down accordingly.

Why is my AC high side low?

Lower than normal pressures on both high and low side, with the correct amount of refrigerant, could mean a problem building pressure in the system or too much heat is being removed at the condenser. A pressure switch or sensor could be bad.

What causes low side AC pressure too low?

Oil-logging is often a major cause of low-side restrictions. There are many ways in which evaporator and suction lines inside tubing can become oil-logged, including: Wrong type or viscosity of oil. Too much oil in the system.

Do you fill AC on the high or low side?

Every auto air conditioning system has two service ports: one on the high pressure and one on the low pressure side. When recharging with AC Avalanche refrigerant, for safety, you will charge through the low side service port. Never charge through the high side port.

What does high pressure on low side mean?

If the pressure is too high than what the chart indicates is normal then that means you have an overcharged system and if it’s lower it means that you might have a refrigerant leak somewhere in the line If you have zero pressure then it means you have no coolant at all and it’s likely leaking entirely from someplace.

What should my AC low side pressure be?

When the engine is on and the AC is on high, low pressure readings should be around 30 psi and the high pressure side should be about 250 psi depending on your car. The correct reading will display once the clutch engages and the gauge stops cycling.

When to use high and low side A / C gauges?

It can be used for recharging refrigerant, or to diagnose an a/c system based on pressure readings from your gauges. In conjunction with a set of high and low side gauges, this temperature and pressure relationship charge can be used to diagnose an a/c compressor that is not working.

Why does my AC have high and low pressure?

The reason you have a high pressure side and a low pressure side at all is because the compressor increases the pressure and as it runs through your AC system to the condenser where it changes from a gas to a liquid and it will eventually lose pressure again as the cooling process takes place.

What to do when low side pressure is too high?

Evacuate the system and recharge with the exact amount of refrigerant based on the car maker’s specifications. One way to check for an overcharged condition is to spray water over the condenser fins while the system is running. If low side pressure drop significantly, that’s an indication of an overcharged system.

What to do when your a / C pressure is high?

Try running the ac while running a garden hose over the condensor. The system uses an orfice tube, pressure transducer on high side line and a termal bulb on the evaporator to control the compressor clutch. The hearter/ ac control head monitors and controls these signals.

What should the pressure be on the a / C system?

It is the same thing as a home air compressor valve, blows off excess pressure. As far as your pressures, was the engine fan cooming on, that would be the first thing i’d look at. Right now your system is undercharge by about 5 to 10 oz. At 90 degrees, low side should be 30-40 and high side should be 250-350 psi.