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Your heater core is leaking; If you got the money, get it replaced.If you can't afford to right away (you won't need it during the summer) you can by-pass it for now:Open the hood of your truck and look towards the passenger side, you should see two thin hoses (about 1 or 1 1/2 inches in diameter) coming from your engine and/or radiator, and going through the firewall; Those are your heater hoses.Cut them by the firewall.If both hoses are the same size in diameter, remove the clamp from one of the hoses where it connects to the engine or radiator; Discard the hose, keep the clamp. Now, loop the remaining hose back to where the other one come from.If the hoses are not the same size, do not discard one of them; What you'll need to do then, is cut one of them about 3 or 4" away from the clamp, and get some kind of adapter from the hardware store (like a short PVC pipe that is two different sizes on the ends) and then use that to join the hoses.Good luck.
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