# A/C Why does the LOW-side pressure *increase* when the compressor runs?

• 1328
• Gerard Morrison

## Why is low side AC pressure high?

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 is the low side pressure with the compressor engaged?

R134a Pressure Gauge Chart

Ambient Temperature (°F)Low SideHigh Side
80°45-50 psi175-220 psi
75°40-45 psi150-175 psi
70°35-40 psi140-165 psi
65°25-35 psi135-155 psi

## What does low high side pressure mean?

Lower Low and High Side Pressures

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.

## Why is my low side AC pressure low?

A low pressure on the low side could also indicate a clog somewhere in your system. If you find a higher than usual low side pressure it usually is an indication of a failed compressor, but it's also possible that your system is simply overfilled if you've recently added refrigerant.

## How do you tell a high side from low side AC?

To summarize:

1. Every A/C System has two service ports: A high side and a low side.
2. When recharging with AC Avalanche, you will only use the low side service port.
3. The low side line of the system will have a larger diameter metal pipe than the high-side.

## What should the high and low side pressures be?

Actual readings will vary according to ambient temperature. The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. Pressure that is too much lower or higher shows there is a problem. On a properly working system, high-side pressure will be about twice the ambient temperature, plus 50 PSI.

## What is the low side of an AC system?

The low side of a refrigeration system usually houses the evaporator, suction line, and any accessory components located within the suction line.

## What should AC pressure be when car is 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.

## What are the symptoms of a bad AC compressor?

Some of the signs of a bad A/C compressor are as follows.

• A Lack of Hot Air Being Released Outside. ...
• Loud or Strange Noises From the Unit. ...
• Failure of the Compressor to Turn On. ...
• Circuit Breaker Tripping. ...
• Leaks Around the Air Conditioning Unit. ...
• Warm Air Instead of Cool Air Being Delivered to the House. ...
• Reduced Airflow.

## What happens if refrigerant pressure is too low?

Low refrigerant means low pressure and low pressure means low temperatures that will eventually freeze something called an evaporator coil. When the evaporator coil freezes, cold liquid refrigerant flows through the refrigerant line, causing the surrounding moisture in the air to freeze.

## How do I know if my compressor is bad?

1. Odd Sounds. You might hear some strange noises when you flip on your vehicle's air conditioner and if you do, it's probably the compressor. ...
2. Hot Air. The whole point of turning on your vehicle's AC is to get cold air to come through the vents. ...
3. Fluid Leaks. ...
4. Stuck Clutch.

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