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No AC systems have drain plugs. You do have two valves a low side and high side valve. To vacuum the system you have to evacuate the system first. Then attach a Manifold AC service gauge set to the valves and use a vacuum pump. This really should be done by someone who is familiar with AC service.

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14y ago
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Q: Where is the drain plug for the air conditioner on a 1994 Chevy Z28 Camaro or which plug is used to vacuum out the system?
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