Doesn't ease into heating the cabin, it just blows cold air immediately

When I start the car for the first time of the day, if I left the heating control on AUTO (as usual) it will blow cold air immediately. What used to happen is that the fan wouldn't blow until the car warmed up so that only warm air is distributed.

Cold air blows hard immediately, and it makes passengers colder faster, which is opposite of what should happen. Although Spring has sprung, how can I troubleshoot and repair the automatic climate control? Thanks for taking my question.