It sounds to me that the mixing door is not working or is stuck between both air tunnels. This doors are usually controlled by suction air traveling through very small hoses. When one of this hoses breaks, suction air does not work causing the door to stay middle opened mixing both airs. All small hoses under the dash board and through the firewall must be checked for damage. If no damage is found the only way to confirm and correct this is removing the dash board. An alternative can be bypassing the hot water lines near the firewall to avoid the hot water to reach the heater inside of the dash board, but this will avoid the heater from working. Good luck!!
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