Thanks John, for your help! This should have been a simple task, but I managed to screw it up. I'm embarrassed to admit that I also had the hoses attached backward (low port to high gauge, high port to low gauge), so I was in fact charging the low side after all. I was in a hurry, and I doing someth...

Hey folks, I replaced a leaking high side schraeder valve on my '99 Silverado 1500, and then used a manifold to recharge the system after drawing a vacuum for about an hour. However, whenever I charged it, I opened both the high and the low side valves on the manifold and I understand you're only su...