97 silverado ext cab A/C trouble
 

Hey guys,

I need a little help. I just purchased a 1997 ext cab and am having trouble with the A/C. When you first turn on the a/c, it works fine. After about ten minutes it seems to get hot and the fan seems to slow down. When you are running at low speeds it works ok for a while but at highway speeds it blows hot. I have checked the freon and it is fully charged. Any help would be great.

Thanks - Steve