It sounds like you may need to find a shop a little more well versed in A/C repairs because this one does not appear to understand the system.
Your blower problem, although it's possible it's a bad blower switch, it's not likely at all. The common failure for that is the blower resister that is found next to the blower motor.
As far as the temperature, he could have done any number of things wrong and I would need the guage pressure reading for both high and low sides to even begin to know why. He may have overharged the system or maybe even didn't remove the R12 oil during retrofit. Either way it doesn't look like you'll make much progress with the current shop.
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