Bad smell coming out of the air conditioner

Sounds like the heater core is leaking and you have "embittered" antifreeze. I can't smell so I don't know what the embittered stuff smells like, but that came around in the mid '90s to keep animals from drinking it.

Look under the hood on the passenger side of the firewall, near the bottom, for a black 4" long rubber hose with a 90 degree bend hanging down. That's where the water from the air conditioner drains from and makes a puddle on the ground. If you see engine coolant dripping from that hose, the heater core is leaking and must be replaced.

If you're not losing coolant too, you might just be seeing the "condensate" making the puddle, The evaporator in the dash is what gets cold when the air conditioner is running. The humidity in the air condenses on that and is collected in a drip pan, then it drains onto the ground from that hose, typically just to the left of the right front tire. That hose can become blocked with leaves and other debris. If that water stands in that pan for a while, mold can start to grow, and you'll smell that. Dealerships and most auto parts stores have a sanitizer with an odor killer that can be sprayed into the ducts to address that.

It's not the leaking heater core that causes overheating. It's the low coolant level that is caused by the leak.

You might be seeing power steering fluid but that normally doesn't have an unusual smell associated with it. You need to have a live person look at the fluid and crawl underneath to see where it's coming from.