I have a 02 1500 slt 5.9l. My problem is that basically my air does not blow at full speed on cold or hot. If i move it from low to high it gets louder but does not blow really any harder..not to much of a difference than it being on low. I have no idea what it could be and its getting pretty hot in the south can anyone help me?
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The common issues for that is a bad blower motor resistor block. Do a part search on www.autozone.com and replace it

 

So i got my air to work weed. The problem was a easy fix...thank goodness. Took off the blower motor and looking above it where it blows air there was this type of flap or door that at one time was attached some where above..im guessing near the fire wall. Anyways it was soild plastic and had some type of foam on both sides..it was broken so i just took it out and i now have nice good flowing cold ac