Sweet smell coming through the vents, what is it?

If the engine is similar to an 04, look to the left and down of the oil filter---on the front of the engine block there is a plate that sort of takes the place of 'freeze plugs'- If you see pink crystals around it, it would be antifreeze seeping here. It seals with only an RTV type of silicone 'gasket maker'. Mine has done this every 80,000 miles. Of course could be hoses somewhere, too, can see those better by removing the top name plate off of engine. First time the dealer did it, about $150+. Second time I did while I changed the oil, it was $15 for the tube of RTV from the dealer for this.