A/c blower randomly blows lightly and I will hit the bottom with my fist it comes back on to full power??? Also when I put the AC selector to floor the Defrost starts to blow?
SOURCE: ac will not blow thru ac vents, only thru defrost vents.
if vent doors are operated by vacuum check for loose or broken vacuum hoses in the engine compartment , or check the fuse box for any ac/heat fuses if it is a electricaly controoled system
SOURCE: air only blows on floor with very little coming out the defrost or regular vents.
Hope you have the same set up, sure you do. You may have either crossed your vaccum lines or when you were putting your heater/ac box back together or you may of pinched the vents somewhat closed. Cycle through the different zones to ensure the vents are moving as your are selecting (defrost, floor, ect...) If you think the vaccum lines are correct then you may have a reassembly issue with the Heater/ac box. I had the same problem with my 2000 Dodge Ram 4x4. Use the KISS rule "keep it simple stupid" start with the vaccum lines and all your wiring to the motors, make sure everything is plugged in. Hopefully you'll find it there before going back into the box again.
SOURCE: 2003 dodge durango front AC vents not working
had this trouble in a dakota it was a blend door in the heater unit. had to remove entire dash to repair
SOURCE: when i have the heater/defroster on the heater
It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.
SOURCE: air only blows on defrost (windshield)
Check vacuum lines on firewall for leak, check all vacuum lines if one on fire wall is ok , doors work off vacuum
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