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Go underneath where the drain tube comes out and blow air up the hose. It may clog again, often there is a build up of sludge in the evaporator case that plugs the drain.

What I do is, use a length of rubber hose such as a neoprene fuel hose that fits tight over the drain tube, then adapt the other end to my shop vac and suck out the debris.

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Q: How do you unclog the evaporator drain?
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