[gmech]

The best thing to do first is to pressurize the system to atleast 250-350# with nitrogen. Check for leaks with soapy water and make sure your pressure doesnt drop. Buy just pulling a vacuum without a thermister guage wont show if you have a leak. Unless its a big one. I know that not everyone has or knows someone who has the right tools but I thought I pass on some info for you all. The same goes for any other A/C or refrigeration system you may have. If you hire a service co. and they repair any leaks, if they dont do the above you theyre not doing their job properly. And with the new 410a they use in our home A/C, it needs to be pressurized up to 600 #.