Q: No heat or cooling at all now; was sporadic. Any ideas on what to fix & cost? on 2001 Toyota Highlander

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Heater and AC no longer work - was sporadic but able to fix sometimes (not always) by twisting knob for temperature and getting it in the "right" place. Then left it exactly there and only used on/off. But now nothing works except the fan does blow current temperature air.
(1) Answer
(2) Comments
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sounds like the controller contacts are bad inside the dash controls. seek a diag and est as not to waste $
Toyota's diagnostic revealed the need for climate control unit (parts & labor $1025). Is that reasonable for a dealer?
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