How Much Freon Does My Truck Need?

By Staff WriterLast Updated Apr 10, 2020 6:47:03 AM ET

Most vehicles need 25 to 35 pounds per square inch of Freon on the low side if the vehicle is running with the air conditioner on its coldest setting and fastest fan speed. The amount of Freon a vehicle uses is measured in pounds per square inch, or psi.