[speeder]

Originally Posted by McLovin

I have all of the equipment, except the vacuum pump. I had one, but it died, and it's been 10 years since I've needed to add freon to a car so I've never replaced it.

This car is almost 18 years old, on the original freon, and it was slowly starting to not cool as well, so I'm pretty sure it's low.

The sticker says it holds 750 grams (26 ounces).

I ended up basically doing what Bob Kontak suggested.

I hooked up the gauges, hooked up a 12 ounce R134 can, purged the freon line, and started adding the can to the low side line.

The gauges didn't really move much (or at all) during the adding. It took the entire 12 ounces. The air coming out of the vents became very cold.

Even though the gauges didn't move much and the pressures seem low-ish (roughly 30 on the low side and 150 on the high, at idle, 75 degrees ambient), I think I'll leave it alone for now.

How did you do this?