Ok first comes the questions.
1) Does the compressor kick in when you turn on the A/C?
If it does not, then this could mean a couple of things. The Pressure switch is bad. It could be overfilled with refrigerant.(not good) Could be low on refrigerant. R-134 is totally different than R-12. It runs at a much higher pressure, meaning that it would actually take less R-134, than it would R-12. If there is too much, there is less room for fluid movement from high side (high pressured Gas from the compressor) to the low side (Condenced liquid on the suction side feeding the compressor) Creating back pressure. And heat. Therefore it will not cool.
2 ) Does the air blow at different levels in the vent structure when you change the switches? (floor, vents, defrost)
Could easily be the switch in the console. Vacuum leaks at the switch, or any one of the valves in the dash or under the hood that cuts off the hot water flow through the heater core. Or a combination of these things.
3)How do you know that it is full of refrigerant?
Again, too much is worse than not enough. Rule of thumb for the average change over system is 3 1/2 cans of R-134a. or 42oz. into an evacuated system. And 12oz of Oil. Pressure should be about 39#'s. with the sytem churning full bore. Atleast that is my experience, on conversions.
This is enough to start. Depending on your answers to these three, the next things to check will follow.
Hope that it helps.
Mike
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