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First, I would suggest, that you pressure test the system with nitrogen to verify that it will hold pressure. Nitrogen is way cheaper than 134a. Then fix any issues/leaks. Once you get the system sealed, you need to use a vacuum pump to properly evacuate the lines. Then you should (most people don't) weigh the freon charge back in. 70 is low for the high side. But the ambient temperature plays a large part for both low and high pressures. Google a freon chart for those details. You can create all kinds of problems when you add freon to a system that hasn't been pumped down. Especially if it has been open for a while.
There is also an issue on these cars with the blend door in the blower box failing. It is covered in foam and the foam degrades over time and comes out the vents. It will cause temp issues in the cabin.
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