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Heater control problem
My 06 4 Runner developed an intermittent problem controlling the heat, especially in Auto mode, with the engine cold it will turn on the fan full blast, open the vents alternately from the windshield to your face to your feet quickly. I can control the fan and vents manually but the heat doesn't come on even though the engine is warming up. Eventually it will start working perfectly on it's own and everything is fine and will work fine for days. It is still on an extended warranty I purchased from the dealer when I bought it new and they have replaced the electronic control panel behind the knobs ($1,000) but that has not cured the problem.
Of course the guys at the dealer have never heard of this and it does not kick out any failure codes.
Any suggestions would be greatly appreciated. It's cold in Minnesota.
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