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It is located on the passenger side firewall below one of the heater hoses. It is a 90 degree elbow and looks like was kind of like a fat bulb with a nozzle on the bottom of it on my car. Pull it off and make sure it is not clogged. If it was clogged you have a puddle of water under your car now. To clean out the tube stick a plastic zip tie into the hole in the firewall where you took the elbow from and up the tube. Move it all around to get any gunk out. If it

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Q: Where do you find the AC drain line on a 1999 Grand Prix?
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