The cooling fins on an R-134 A/C system are tightly packed to get maximum cooling in a small heater box. The brainchild engineer that came up with this design was really thinking on his feet. Unfortunately, all that condensation wicks deep into those fins and starts growing mold. Pretty soon, your whole car starts smelling like sweaty socks. You can spray a can of Lysol into the fresh air intake on your car and it will help, but only for a short period. You really need to attack the problem.
experiment growing inside your dash, but also treats the evaporator coil to prevent it from happening again soon. The manufacturer says that one treatment lasts a full year. I’m have no connections with the company, but their product works well.
A clogged evaporator drain can make the problem even worse. If the mold gets bad enough, the slime clogs the drain hole and turns the whole evaporator box into a swimming pool of toxic sludge. So make sure you snake out the evaporator drain before attacking the rest of the mold problem. Run your A/C. If you don't see a puddle of water under your vehicle, you've got a plugged drain. Use a pipe cleaner to clear it. Then inject some clean water to flush it out. You might be tempted to add some bleach to the flush water, but don't do it! Bleach is very corrosive to the metals in the evaporator.
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