AC Liquid Line Very Hot

water line for AC

Pressure and temperature are key factors in home cooling. AC compressors ensure that high-pressure compressed air flows outside while low-pressure cool air flows into the house on a hot day.

When there's a problem with your compressor, two things are likely to happen. The air in the house will not be cooling at all or it may not cool to the desired level. You can determine that you are having problems with your compressor by checking the pressure in the suction line.

The temperature in your liquid line may also be helpful. Higher pressure or temperature than the recommended levels should be a red flag. However, high pressure or temperature doesn't always mean that your compressor is faulty.

Causes of High Temperature and Pressure Diagnosis on Your AC

man checking AC unit

Airflow Is Blocked Across the Condensing Coil

When the condenser airflow is blocked, you should expect to receive a high head pressure diagnosis. You may receive a normal suction line pressure and normal superheat but you may also get high subcooling temperatures.

Airflow Across the Cooling Coil

The other cause of pressure and temperature problems is blocked airflow in the air handler. You are more likely to experience high pressure if the TXV and its temperature sensors remain closed.

Check Valve Inoperative

Check valves are very important in controlling the pressure of the suction airflow. If one of the valves is faulty you may experience abnormal pressure and temperature.

Although both low and high pressure could be recorded for this situation, it is important to look at this problem before thinking about replacing the condenser or compressor.

Clogged Filter Drier

Clogged air filters could also be a major cause of high pressure and temperature. If the filter is not clogged, you won't experience any temperature abnormalities. However, this is something that needs to be checked to determine whether it is the cause of the problem at hand.

Contaminants on the Compressor Valves

Contaminants may include dirt and debris that make the valves fail to work appropriately. These contaminants can lead to low or high suction pressure which could also result in temperature fluctuations. These are situations that can be handled by replacing the valves.

Block in the Refrigerant Piping

Most people do not want to look at the refrigerant piping because access to it is sometimes difficult. However, if the piping is not passing sufficient refrigerant, there will be an imbalance in the temperature of the system. This can consequently affect the pressure within the system.

Debris Clogging or Crimped Refrigerant line

Instead of replacing the entire condenser, in some instances, it would be better to just have a look at the condensing coil. The condensing coil having serious problems could also mean high pressure on your compressor. However, this should only come after checking out the other aspects.

High Outdoor Ambient Temperature

In some cases, when the outdoor temperatures get too high, there are chances that the compressor will get overwhelmed. This is because it would be required to compress the inflowing air to very high pressure and heat. As a result, the diagnosis of the system may show high pressure.

Bottom Line

There are many issues that could cause high condenser pressure and temperatures. These issues should be analyzed well before thinking of replacing key parts.

You may want to try a basic cleaning procedure, repealing of valves, and others before opting for replacing the compressor or condenser. Make sure you have the right skill if you choose to undertake these steps yourself.