So today i drove the equinox around town quite a fair deal. by the end of the day late at night there was a very distinct and audible rumbling/groaning sort of noise coming from the front center area under my car. It was raining all day today, and the only other times this has happend before have been in torrential downpours. so im pretty positive whatever it is is caused by water? At first i thought it had something to do with the engine/intake-exhaust however when i open my window to listen if i can hear it better outside while driving i cannot, and when i parked in the garage and gave her some gas to see if i could hear the rumbling in the quiet of the garage i heard nothing. so since i only heard it while driving it leads me to believe i has to be something with the tranny/axle/tires.(?) im assuming someone else has to have encountered something similar. (seems like most people have with the 'nox). any info would help. only info i could find was possibly water into the manifold?