[Astroboy]

My climate control is almost always set to "AUTO" at 70F degrees. During the hot summer days with AC on, I engage "RECIRCULATE ↻ " to rapidly cool down the interior air.

However, I can't seem to be able to do the same thing when the heater is on. When the outside is cold and I turn on the heater, the heater takes in the cold outside air, warm it up and send it inside. Why can't I have the heater to take in the already-somewhat-warm interior air and heat it even warmer?

When my heater is on and I press "RECIRCULATE ↻ ", the computer seem to override and disengage it in a few seconds.

Is this normal?

Is my recirculation (blend door) broken?

I have 2008 H2.

Thanks in advance.