99 Navigator Heat Problem

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Sep 17, 2011 | 06:52 PM

DTL504

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Joined: Mar 2003

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99 Navigator Heat Problem

I have read numerous articles about the blend door problem and watch the HeaterTreater.net video. It seem that I may have a different problem. I lower the glove box and can see the door moving in the upper right hand corner as I change the electronic temp control button to 90* temp but the force of air is weaker then that of A/C.

Question 1. Is the upper right corner vent on the Navigator different then that of Exped/F150 or do the Navigator have a second bend door on the left side entering the vents?

Question Two:
Where is the heater control valve? From previous post and diagram its located under the hood. Clarification Please!

Thanks in Advance for any insight or guidance before I just start switching parts without identifing the root cause.