AC R134a Retrofit
I have a 7 blade clutch fan with a shroud
Should be adequate.
and the condensor is a stock type
two row.
That was an error. The main performance choke point in the system is effective condenser heat rejection capacity, even with R12. R134a needs more condenser heat rejection capacity than R12 for a given level of system performance. You'll be able to get much better performance out of the system if you put in a parallel-flow condenser -- the biggest one that will fit the cutout in the radiator support. They have much greater effective heat rejection capacity for any given condenser size.
I didn't add any insulation to the cabin
You'll want to, otherwise you're trying to cool a solar oven and you will fail no matter how good the A/C system is.
but it is a factory AC car so it has tinted glass
You'll want real/effective tinting. Not the cheap purple garbage -- I'm talking about the films from the likes of Llumar. It doesn't have to be dark tint, either; the newer films reflect a lot of heat while letting through a lot of light.
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I thought A bodys came with a cycling switch installed from the factory.
Yes, systems through '73 have a clutch cycling switch and systems '74-up have an EPR valve. You mentioned removing the EPR valve so I guessed you were working with a '74 + system. If your stock clutch cycling switch is hooked up and working, you're all set.
Is there a difference in the type of 134?
No, R134a is R134a. But as the others say, make sure you are buying pure R134a, not a "stop leak" or other blended product.
