Quote:
Originally Posted by Diesel911
No problem to my Knowlege concerning the Vacuum.
If you have some time inbetween you might look up if you need to change the Filter/Dryer in the AC System (if this system has one).
I have never done AC work on a Car but I have read that if the Dryer is exposed to Air moisture it starts to mess up the innards of the Dryer.
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You are generally right in all this, but it sounds like you don't understand the reason behind it.
If a drier is exposed to air, the dessicate in the drier can easily get saturated with moisture. When this happens, there's no where for the moisture to go except to get combined with the refrigerant to form an acid. The acid then eats up the system from the inside out.
Whenever you replace a drier it is USUALLY done when the system is opened up to replace a component, fix a leak or something similar. When you do this ALWAYS get everything together and uncover and install your new drier the very last thing. Then IMMEDIATELY or as soon as possible, connect your vacuum puimp and evacuate. This way you get most of the moisture out of the system before the dessicate begins to soak it up. The less it soaks up, the more room in the dessicate to trap whatever residual moisture is left in the system.