What would likely be the cause of AC blower running slower when the Recirculate button is on?

If the Recirculate button is pushed while blower speed is on HI the blower cuts back, on it's, after about a minute. Blower stays at low speed and will not follow the blower speed wheel up at all until key off and restart.

This is particularly troublesome when getting into a hot car and wanting the maximum cooling effect right away.

Also I have noticed that the fans in front of condensor/radiator do not come on either under these conditions. Seems to me thats when they would be most needed to cool the car quickly. Is low freon suspected when max cool does not engage cond. fans?

Any insight appreciated.

DanielW