Chevy Express Hvac Vacuum Diagram

I have the same vacuum problem on a 2001 express 3500 van, the air is The ac on my chevy 3500 1 ton 2001 van blows cold air out the defrost Chevy van ac air actuator defrost vents 2001 chevrolet nothing comes but procedure removal blows cab

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I need a detailed vacuum diagram/emissions diagram for a 1986 3/4

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