What causes high-pressure in AC system?

Once the air gets to the condenser, it will remain at its top and not condense. The subcooled liquid seal at the condenser’s bottom will prevent the air from passing out of the condenser. This air and water vapor will take up valuable condenser surface area and cause high-head pressures.

How does a Peterbilt a / C compressor work?

The system cycles off of pressure because there is no freeze switch. So the system is very sensitive to proper charge. The system uses a pressure switch which is gray in color and located in the low side To cycle the compressor. Click to expand…

Where is the pressure switch on Peterbilt a / C?

The system uses a pressure switch which is gray in color and located in the low side To cycle the compressor. Ashman_42 Thanks this. This is common with pete.

What should AC low side high side low pressure be?

On the other hand, there is possibly a huge leak when the pressure is zero. AC Low Side High, High Side Low: Why Does This Happen? The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi.

Is there a charge for Peterbilt a / C service?

There is no charge for this service, but standard message and data rates may apply. Give gearhead a shout. I’m sure he’ll have an idea. the fan should kick on at 350 psi I believe, and 20 psi is extremely low… This is common with pete.

The system uses a pressure switch which is gray in color and located in the low side To cycle the compressor. Ashman_42 Thanks this. This is common with pete.

What does a pressure reading on an AC system mean?

Well, the pressure readings of your AC system is what indicates whether the AC is functioning properly, or if there are underlying problems, such as leaking refrigerant, system damage, or worse, compressor failure, which can easily cost you a fortune in repairs.