Drove 250 miles today from TN to GA. Half way through the trip I smelled a very faint smell like burning coolant. I didn’t think much of it since many Honda’s I’ve driven have smelled like that after some hard highway driving. Get home, unload the car and then move it out of the driveway. Noticed a few spots on the driveway. Very slightly oily and didn’t have much of a smell (or taste). I looked up under the car and there seems to be some residue around the radiator drain plug. How do I check the radiator for leaks? Also I’m not sure if this has a transmission cooler (2008 EX-L) but if it doesn’t am I still at risk for the strawberry milkshake? Thanks in advance.