My 2000 Century Custom has 2 control levers that independently adjust the air
temp for driver and passenger. The driver's control lever moves freely but
the air is stuck on 'heat' full-blast no matter what the lever setting.
Occasionally, when the lever is adjusted, it will change over to cool vent
air (not a/c) and be stuck in that setting for a while. The passenger side
control regulates just fine. Any suggestions on how to fix this?
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