creaking noise heating valve

The heating/cooling system (Camry 2004 V6 3.0) reacts abnormal, like the electronica is messed up. On the other hand, it could be a mechanical
problem, because the heating valve - somewhere underneath the dashboard - is creaking and rattling. In the extremes COLD/HOT the valve stops to creak/rattle. Does somebody recognizes this problem? Clues? Thank you.
Ed Dokma
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