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Wow. 3 cans. This was the 22oz. bottle. I am a total novice, so if I need the valve cores, are they difficult to replace? I'm willing to give it a try. I should be able to check the low side pressure again with the same gauge on the empty bottle, should I not? Are the advertised sealants...

Engine running & AC on high. Initial pressure around 10psi. Compressor kicked in after adding coolant for about 15 seconds and stayed on. Attained about midway thru the green zone and it stayed there until canister was empty. Pressure then dropped back down close to 0-10 psi. Only hissed...

OK... next step? I got the kit and went thru the process of recharging. Pressure came up nice and stayed in the green as ling as I kept adding coolant. As soon as the canister was empty, the pressure dropped back down. So, I assume a leak somewhere is the culprit. Time for an expert or...

Hey All, I have a 1999 Tahoe 4x4 with 137,000 miles. I had the A/C unit recharged last summer (2011) for the first time. Worked great. This last week it got hot enough to turn it on again. I engaged the A/C button and it did not get cool at all. When I was parked, I tried it again. I...