Quote:
Originally Posted by gtojohn
Replacing the dryer would be more important if there had been a failure and you were more concerned with debris or moisture. The vacuum will remove the moisture. When you're done with your repair insulate the low side "cold pipes" with pipe insulation to reduce all the underhood heat gain increase your capacity. A lot of the new cars have insulation around the accumulator which is a great idea.
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I have always wondered about the need to replace the drier if a material part has not self destructed causing shrapnel in the system. I always presumed you needed to replace the drier because it is possible to take water from liquid to solid through the simple use of vacuum. I've never investigated what desiccant is being used in an A/C system to attract and contain the moisture, and whether dropping a vacuum on a "moist" desiccant boils the moisture off, drying it out again. Interesting...