Sweet Burning Smell??

[cozykat]

Hi Everyone,
I noticed the last 3 days... a sweet burning smell coming from around the AC/Radiator area. I don't see a leak anywhere.. but I wonder if I am smelling burning coolant? I thought it was in my imagination but tonight, I started to smell it coming through my AC vents.. its a soft odor.. just strong enough that I can't ignore it and I don't want to if it's what I think it is!
I am keeping an eye on my car's fluids (not low or noticeably decreasing yet) and trying to see if i can pin point the leak.
Just looking for some advice on where I should check.
Thanks!