the A/C blows colder and harder than most new cars i've been in, but the heater doesn't work. basically, with the temp **** on hot or cold, it's all one temperature. wondering if this is a common occurance and what i might be able to look into as being the problem.

 

Broken blend door

or

possible water bypass valve stuck

 

mostlikely a blend door issue. The actual door can brake from the actuator and that is a big job requiring the dash to be removed along with other various parts.
Then there is the Blend Door Motor / actuator. There are sensors and gears in it that can fry some times. Its located behind the glove box on top of a "ledgey" section of the black "air controll" assembly. it usualy is white and looks like a small 4inch by 3 inch module. its held in by >8mm bolts that are dificult to get at. So be patient with the wrench. A socket might not be able to reach.
And RARELY but it does happen in the hoses: the bypass Valve. Witch is actuated by vacume.
But my guess is the blend door.

And check your coolant too.

 

yeah if you want heat youll probably have to remove your dash.

 

If it is the blend door.

http://www.blenddoorfix.netfirms.com/



Before all that work I would make sure the hoses leading to the heater core get hot. A simple touch test after the bypass valve will do.

Also verify coolant level before you warm up the truck.