Okay, bought the comressor, and expansion valve, and a receiver, an o-ring kit, have the freeze 12 from DG, and PSYCHED up about getting greasy this weekend. Then, I found out the Army Base Hobby Shop isn't open until next weds (96 hours from now). If I crack into the a/c, blow things out, new o-rings, reassemble, is it gng to hurt anything to have air in the system and no vaccum for almost 4 days? Should I wait till monday to crack it open (2days)?

System is currently R-12, all original so far. If the Hobby Shop has a reasonable price for R12 and it holds vaccum, I may fill with R-12.