Accent RB (2012+) :: Popping Noise When Turn The Wheel About Halfway In Either Direction

So, I now have just under 20,000 km on my Accent, and lately there have been some noises popping up. I'm wondering if they're normal or not.

1. At low speed or completely stopped, when I turn the wheel about halfway in either direction I hear a popping noise. It sounds like it's coming from the steering column, but I'm not completely sure. I just began noticing it a couple days ago. So far it only seems to happen after the engine has warmed up; doesn't happen right after a cold start.

2. After the engine has warmed up, I also hear a knocking noise coming from underneath the car. It happens only at low speeds or when stopped. It seems to be directly related to the engine RPM.

When it idles around ~700 it will knock once. If I keep it in neutral and press the gas, it'll knock again. Let it idle, knock. Apply gas, knock. It also happens when in gear. I think it's either the fuel or exhaust system. Maybe it's the sound of the in-tank fuel pump turning on and off? It sounds the same regardless of how much fuel is in the tank.

This has been going on for a couple months now, and there don't seem to be any ill effects related to it... yet.

3. This isn't a noise, but a smell. Since it's summer here now I've been using the A/C quite often. While it's running it's ok, but when I turn it off it smells like a wet basement for a while.

I'm thinking that maybe the evaporator isn't draining properly and mold is growing in there. If I turn the blower on high right after turning off the A/C sometimes little water droplets will come out. I should also mention that it's very humid here at this time of year.