Heater problem
1999 Ford Windstar 6 cyl Two Wheel Drive Automatic 120000 miles

I am not getting any heat on any of the settings, whether it is on defrost, floor heat, ac, etc. What could possibly cause this, and can I replace the part myself. What would be the cost if I did the repair? and, what would be the cost if I took it to a repair shop?

More then likely is the blend door motor. They cost around $50.00.. They are pretty easy to replace.. I have no idea how much it would cost to have somebody else do it because I did mine myself.