How do you know when all the freon is removed? If you pull a deep vacuum for say 1 hour, how do you know if all the liquid refrigerant has been removed? Or does the refrigerant automatically turn to a vapor under a vacuum condition and get drawn out that way? I just don't understand how evacuation of a system is pulling out liquid freon. I understand that evacuating does not pull out the oil, and that is a liquid. How much does underhood temperature play a role in evacuating?
R-12 boils at -21 degrees F at atmospheric pressure R-134a Boils at -15 so if your pulling a vacuum on your system it will all vaporize unless the ambient temp is considerly lower than -15 or -21 degrees
Edited: Tue July 06, 2010 at 8:15 PM by Spector
When you pull a vacuum, you're lowering the boiling point and pulling out anything volatile or semi-volatile. This means trace refrigerant, air, and especially moisture. The refrigeration oil molecules are too large to be volatile.
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