I just had the problem fixed in my 2000 ford windstar. It is the actuator motor. Stripped gear. However also common to the problem is the blend door. Being plastic. Frequently cracks and then flops. I changed both. I got an upgrade blend door all metal from heatertreater. Net
mine was doing the same thing blowing cold and knocking noise.
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Sunday, September 20th, 2009 AT 6:09 PM