What causes high head pressure on a AC unit?
What causes high head pressure on a AC unit? 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 to add refrigerant to a 2002 suburban? How to add freon to your 2002 Chevrolet Suburban 1500: hook up the can of refrigerant (likely r-134a) to the low pressure port. When your compressor kicks on, add freon to the correct...