I can't get my ac to blow cold. Iv replaced all my motors under the dash and my condensor. My ac compressor kicks on so I doubt thats the issue. I went to vacuum the ac system and low side drops below 0 as it should but high side stays at 0. Would I need to replace the high side line?

 

I wouldn't get tripped up on the gauge reading while vacuuming. It pulls from both sides and both the high and low side are in one system at that time (nothing separating the two). It's probably just the gauge. But how are the readings with a full charge and running? This car is actually one of the rare one's I've owned that when the compressor failed, it still turned on, but made no pressure. Gauge readings stayed static even with the clutch engaged. Not saying that's what's wrong with yours, but as long as you have a gauge, you should check to see what your running pressures are.