Back story: My wife bought her 2009 Rav4 Sport V6 4x4 in Jan of 2011 w/29k miles on it. A few months after purchase she got the loud whining noise from the trans/rear end. Toyota replaced it under TSB/Warranty for no cost. Ever since then we've noticed a coolant smell whenever she parks it in the garage. I'd notice the coolant reservoir getting a little low when changing her oil, and I've simply topped off over the past couple years. The last time I changed the oil I noticed the reservoir was completely dry. Uh oh. So I filled it up. Today after taking it out for a quick drive I popped the hood in the garage and once again noticed the reservoir was bone dry again. Crap! I looked around and couldn't see an actual leak of any kind, but definitely smelled the coolant smell again. After closer inspection I looked at the back of the radiator with a flashlight and discovered this monstrosity. I also noticed all the dried fine coolant mist on the engine and in the same area. No odd noises whatsoever coming from the engine when on. Is this absolutely a sign of a bad water pump, could it be the radiator itself, or could we get lucky and it's just a leak from one of the coolant hoses down there?