Vintage Air System not too cool????!!!!

RedFish said

Lowering the temperature of the refridgerant while in liquid form is the science of a/c.
The fan should run contiuously when the a/c is on. That way the fan doesn't need a temp sensor on the refridgerant it simply ignores coolant temperature when neccessary.

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I have seen this before with some systems.I found that there is a 134 a freon booster you can get it at most auto parts store.Also there is another freon called ICOR HOT SHOT it can replace 134a with a 14 % increase in cooling.If you go this route call a company in your area that does home a/c ask them if they are familiar with the product as it takes less Hot Shot to do the same job.

Hope this helps And yes the fan should be on when the a/c is on.