When I open the A/C system, how long is too long?
 

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.

Where's the dryer at on your list? :confused:

He's got a new receiver, isn't that the same thing?

Receiver, dryer, yep, have one too. Thanks, Chuck.

Ah okay, didn't see it. :o

You should be fine. Don't forget the new mineral oil if you stick with r12.

Just don't open the drier until you are ready to hook up the vacuum pump.

I had this exact question, so I appreciate the answers also. And the question.....:D

Install the drier dead last before you seal up the system. Opening up the system and exposing the drier for very long will ruin the desicant. Make sure you pull a vacuum on it for about 1 hour and let it sit another to make sure there is no leaks.