2000 Dodge Dakota 6cyl: The problem is the AC

When you did tune up,this will help me to help you,all the best.

I have a 2000 GMC Savana Van SLT with front and rear AC/Heat. My front would blow hot while the rear blew cold with AC on. It turned out to be low on Freon. It's hard to know if you have the right amount of freon installed because pressures vary depending on the ambient temperatures. So the best way is to remove all the freon then reinstall the recommended amount as listed on the evaporator housing near the firewall. This worked fine for me... works like new after installing the correct amount of freon.

You need a new thermostat

Fuel pump check valve is leaking causing fuel to drain back into tank..... the fix is a new fuel pump.

The heater core might need back flushed, I just did mine this winter. Go to dakota-durango.com and introduce your self and your rare as ever truck, a v6 durango, and have fun.

What models of dodge are interchangeable with a 2000 Dakota glove door latch?

Vent door cable or actuator broken or malfunctioning.

You can purchase R134a cans with a built in gauge so you don't overcharge... Assuming the system has not completely discharged, usually a can or less will do. Here is a link with some basic instructions:
http://www.sadik.net/nissan/howto/ac_r134.htm

You may want to have the AC cleaned out.  This involves removing the evaporator and cleaning it inside out.  While you have it out, have the vents check if you have the "door" that lets the outside air in if it is working,  Just to be sure that the dust did not come from the outside.  You may also want the AC freon checked out.

check for dirty or pluged cabin filter.normaly you will this find this under the dash on passenger side. also check in shop manual.