Welcome to FTE!

There is a "workaround" available for some situations involving a broken blend door. Many people have used it with great success, but a lot depends on how bad things are busted up in there:

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

Here is a thread wherein people have posted about their experiences using the "Ford Blend Door Fix":

https://www.ford-trucks.com/forums/s...ad.php?t=24962

Good luck, hope this helps.