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There is a little white box, with a small plastic gear that opens and closes the blend door. The box also has temp control sensors that connect to the dash controls. The small plastic gear is stripped out, and will not close the door or moderate temp. Behind the large plastic piece under the ashtray.

(Blend door actuator, XF2H-19E616-FA-R247-B19791- MAN

Part #604203/$50.59 Advance Auto.)

dan.manning@Yahoo.com

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Q: What can cause the automatic temperature control to not maintain the preset temperature and a noise in the area of the blend door?
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