Anyone ever experience this. I've only had my 1990 350 SDL since last September. The freon is fully charged and the Climate Control does everything it's supposed to....except, when it's over about 80 degrees outside, the A/C will ony come out of the defroster, side vents and rear vent. Once it cools down outside to below about 80, the climate control switches the air to all the dashboard vents as it should. ???? Any ideas???