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A similar thing happened to mine a few months ago. The misting up happened pretty quickly after starting the engine though but it took for ever to demist with full heat and max. fan speed on defrost. It turned out to be the recirc flap being shut - the diagnostics cannot tell if the flap is stuck or the motor burned out. It was the motor and it was replaced under warranty. The recirc light does not come on under these conditions as the brain thinks it is open.
Hope it is not the heater core!
John
posted by 81.86.157...
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