well my a/c worked when i got my 94 astro awd vortec with rear ac a fewe years ago. while working on it i accidentally cracked the nut on an ac line and closed it back quickly. it was in the winter so i'm not positive if that's when the a/c stopped working but i imagine it was. i got a recharge kit and the low pressure port reads 120psi and it blows warm air... my a/c classes don't start for a few weeks so i'm not well versed on ac. wha would a high pressure on the low side indicate? and how do i go about fixing it?