heater

It was just recent that I took the car to work. I cranked up the heater, then a few minutes later I've noticed this weird nasty smell coming out of the vent. I turned the heater off, then put it back on and still the same problem after a few minutes later. I went outside and i noticed the smell...

So, my heater stopped working at the perfect time! No matter what temperature I set the dial to, it seems to blow the same temp air out. Is there a switch inside the engine bay like some cars that moves around when you move the dial to hot and cold? Not really sure what the problem could be...

I did some searching and wasnt really able to find anything helpful and was hoping someone here could help out. A few days ago my friend replaced my caliper on my passenger side front. Afterwards whenever i brake it causes my ebrake lgiht to come on and stay on until ive driven for a minute...