# What Causes High Pressure On The Low Side Of A Ac System?

AC Low Side Pressure Too High Causes If the air conditioning isn’t blowing cold air and the low side pressure is too high, it could be caused by issues with the condenser fan. However, there’s also the possibility that the system has gotten overcharged with too much refrigerant.

## What does it mean when high side and low side pressure the same?

What Do Low Pressures on Both Low and High Sides Mean? Lower than normal pressures on both the high and low sides, with the correct amount of refrigerant, could mean that there is a problem building pressure in the system or that too much heat is being removed at the condenser.

## What should high side and low side AC pressure 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.

## What Should low side AC pressure?

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.

## What does it mean when both gauges read the same pressure?

That means that you are getting suction on the low side and expansion on the high side. IF you don't have adequate airflow through the condenser, you will see your high side pressure spike. With the A/C OFF, both sides should equalize and have the same pressure reading.

## What factors can affect the high and low side gauge readings?

Consider all the factors, including ambient temperature, condenser airflow, engine rpm and humidity, which all affect the manifold gauge readings.

## What should the low side pressure be in a R134A system?

Ambient Temperature (°F) Low Side High Side ------------------------ --------- ----------- 80° 45-50 psi 175-220 psi 75° 40-45 psi 150-175 psi 70° 35-40 psi 140-165 psi 65° 25-35 psi 135-155 psi.

## What PSI should I recharge my AC to?

A manifold gauge set will help to measure the psi's in the system. The gauge will help identify when the system is adequately pressurized. For a good charge, the low-pressure gauge should read between 25 and 40 psi (pounds per square inch), and the high pressure gauge should read between 225 and 250 psi.

## Why is my low side pressure higher than high side?

AC low side pressure getting too high means that the system can't generate the needed temperature to cool down the vehicle. This situation could be related to several possibilities. It could be something to do with the compressor or refrigerant added to charge the AC or even a leak in the system.

## What would cause AC pressure to be high?

Overcharging the system and leaks are some common reasons for AC issues. However, other issues could be: loose wiring, slipping belt, low or old oil in system, and the use of wrong compressor lubricant can cause issues with your coolant system.

## Why is my low side AC pressure low?

If the pressure is lower than in the chart, the refrigerant level is low. The system is probably leaking. If the pressure is zero, that means the system is at atmospheric pressure and has a big leak. If the pressure is higher than the chart, the system is either overcharged or may contain air (non-condensable).