How do you know it is holding pressure?

I installed all new components for the AC system on my 73 corvette and pulled a vacuum on the system. After pulling 29" of vacuum I shut off the low and high side valves on the AC manifold gauge set and then shut off the vacuum pump. The system dropped down to just over 15" in about five ...

7.2 ounces.

I'd consider the manual option of the auto. There are fewer areas to have issues with and with these old units. And might not be able to get service parts for them. These machines are not as complicated as some like to make out. They recover and filter refrigerant and recharge via storage container....

Mod's: Okay, to leave this link. This individual supports the forum.

They make a cap/valve core kit for this vehicle. But we are not on eBay.

tbirdtbird wrote: ↑Fri Oct 27, 2023 8:22 am 5 dollars gets you all of them, then you can figure it out. Cheaper than 13

We have a winner.

I have the answer for $12.00.

We sold our shop in 2015. How do I know it worked? We were a business with many different cars over many years using micron gauges. When you start the vacuum pump with a very high range, let's say 8K. And it pulls down to 500 microns. In my book, using top-of-the-line equipment. It's working. I don'...