Step 2: Find the low pressure service port in your vehicle's engine. If you're not sure where to look for it, download the A/C Pro app for specific information linked to your car or truck model year. Mine was easy to find (a blue cap with an "L" imprinted on it).
Step 3: Start your engine. Set A/C to its maximum cooling level and recirculation mode (with fan on highest setting).
Step 4: Place hose coupler on low pressure service port and press down. It will click into place and lock down securely.
Step 5: Check gauge to determine if your vehicle's A/C system is low on refrigerant. My gauge reading indicated I needed a major fill (it was on zero).
Step 6: If low, remove coupler from the service port. Unscrew gauge/hose assembly from the new can of A/C Pro. Unscrew the protective shipping tab on the top of the dispenser. Screw gauge/hose back on the refrigerant can. (Be sure to wear protective gear: gloves and safety goggles.)
Step 8: Check the gauge to see if the needle is in the green filled section. Do not overfill! If the level is still low, repeat step seven. If filled to the mid part of the green section, you are done. Check the air temperature coming out of the vents inside your car. My air was perfectly chilled at this point.
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