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Your mechanic is blowing a bit (actually a lot) of smoke. You have already proven the radiator is fine.
Mine does the same thing both with R-12 and R-134. I have noticed that it is a bit more pronounced that I converted to 134 - but nothing that would concern me temperature wise.
The only thing I can speculate as to the cause is:
1. Compressor getting good and hot, It probably doesn't help that my compressor isn't nearly as efficient as it used to be. The compressor forces the freon into a liquid, generating a lot of heat which leads to.....
2. All that hot liquid freon running through the condensor (sitting right next to the radiator), throwing quite a bit of heat leading to:
3. A good deal of hot air running through the radiator, reducing cooling efficiency until everything cools down.
I would make sure that your radiator and condensor are good and clean - I would also consider combing your the cooling fins on the condensor if they are bent from road debris.
As long as your fans (both) are running and the temp never goes above the 3/4 mark, I wouldn't worry too much. If you are like me, you check your coolant levels at least once a week anyways.
AFJuvat
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