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Your sunroof has a drain tube that needs relocated, I think there was a recall on this... Same thing happened on my 2004 GLX..
Where is the ac drain tube for 2004 grand prix
Open the sunroof and find the four drain holes. Clear any debris. Blow air inside the drain tubes to find out if there is any blockage. Slide the replacement tubing inside the drain hose.
The drain hose is located to the left of the engine compartment just below the AC lines coming out of the firewall. There is a rubber tube about 1" diameter and it has a small plastic tube coming out from the bottom side of the larger tube. This sometimes gets blocked and causes leaking onto the rug area inside the truck, just pull the larger tube out and clean the small/large tube. If there is any water from the AC it will drain out. MrT.
To repair a leaky sunroof, you need to clean the drainage tubes on your sunroof. You can do this by sticking a thin wire or coat hanger in the drain. Then pour some clean water through the drainage tube.
If you have a water leak, you need the check the drain tube at each corner. If it will not move, check the fuses.
At the bottom of the firewall on the passenger side
Just the drain tube "yes" but not the nipple that it goes to.............
Most likely the drains are clogged. What you need to do is open the sunroof and use a blow gun in side the front and rear tube to dislodge whatever is clogging the tube. After a few good blasts you can try pouring water through the tubes to check to see if that worked.
The drain tube is probably clogged. You can see the top of the tube in each front corner of your opened sunroof. A 1/4 inch plastic tubing about 6 feet long works ideal to run down through that to open it. Work it slow with moderate pressure because it has to navigate some bends, but it will come clear out the bottom. The bottom of the drain is a larger looking tube with a bevel end at about 2/3 up on the front door hinge frame. When you open the door, you look in past the hinge to see the tube.
under car folow ac lines into small tube protruding out near them
Assume you're describing the condensate drain tube??? If it becomes plugged with crusted mud or dust that got wet and stuck to the tube, there can be a point that the tube won't drain properly. You may need to get under the vehicle, find the tube and run a small, flexible wire or other object up the tube to allow the condensate to drain. Once you get it open enough to drain, it might be a good idea to run a small tube up the drain and allow a little water, under low pressure to irrigate the drain tube.