I would check/replace your thermostat .....It closes to heat up the water, opens to cool it off.....yours must be staying open. Or it could be your Temp Senser (engine block)
Do you have a engine temp gauge? If so see if it is reading normal, If it is reading low you may need a thermostat, check your coolant and see if it is full, If all this checks out the electronics for your blend doors is acting up, or you have something keeping the blend doors from moving, i have found a pencil in a blend door before.
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