If I understand the problem correctly, you want to blow hot air thru the floor vents & the dash vents at the same time. When doing so you are not using your A/C compressor.
When directing air (other than using your A/C) you are engaging a solenoid that directs air to the floor. dash, or defroster vents.
When using your A/C, air is directed thru the dash vents only.
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