How can you determine when ac on car is full when adding freon?

Question

How can you determine when ac on car is full when adding freon?

Answer 1

i assume you have an ac machine. evacuate the system, vacuum it for 10 minutes and simply put in the correct amount of refrigerant in ounces

Answer 2

I used to be done with a Sight glass and if there was bubbles in the liquid sight glass it needed to have freon added. That was with the older R12 systems. With the new R134a systems you load by liquid volume or weight. Each system capacity is different between car models and brands. If you need to top off a system, it is done so by first checking the systems pressures and compare them to data charts, experience, and the temperature and humidity of the day.

Answer 3

you need manifold gages and a chart for that car,it will tell you what the low and high pressure should be,and the pressure of each will tell you if you need to add or if you have to much freon,hope this helps.