I have A/C dye dripping from the drain hose. Is this normal? If not, how would I stop that?

 

There's a leak, most likely the evaporator itself but sometimes something else in the evaporator box, which you will soon confirm when the A/C stops working.

Fortunately it is quite easy to remove the A/C box from the car and replace the leaky part, compared to most American cars where the whole dashboard must be removed to work on the evaporator.

The other possibilty, if you just acquired the car, is there was a leak which has been fixed but there was some dye left in the box.

 

Thanks. I pulled out the evaporator. It was plugged with crap and leaking all over. That was a lot easier to remove than I expected.