I discovered a problem with the actuator sticking half way on heat when dial set to coolest. Remove glove box and find actuator arm behind stereo. With the engine running operate the heat control knob and you can see if it is operating through the full range. Mine was only going half way off.
I turned the ignition off again after setting to coolest ang got a screwdriver and gently pushed the arm all the way back towards the front of the car hearing clicking as it went. I then turned the engine on and tested, it worked through the full range and was no longer hot on cool setting.

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