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Posted (edited)

I got 99 Silverado 1500 with the 5.3. Pretty sure one of the ac manifold hoses are leaking. I can’t tell if it is at the crimp or just the rubber hose. Either way, is this a common problem?  It has leaked everything out of the system. 

Edited by dirtdriver11

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Rock in the condensor core, blown compressor seal, corrosion at the evaporator from condensation - all are more common.

Will need to do a leak detection test.

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I just had to deal with a similar problem on a 01 GMC. Check the high side pressure port for a leak. From what I'm able to find that is a common problem, because GM decided to use a ball valve rather than a Schrader valve. The ball valve is leak prone. Fixes include new port "guts" (ball valve style), change out to Schrader valve or the one I'm trying, a little screw from Dorman that just plugs the port.

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