I have a new Coleman 2021 400 with about 10 miles on it. I noticed yesterday that it appears to be leaking coolant. After spending some time tracking it down, appears it's coming from a fitting that sticks out of the block near the oil filter. (maybe the water pump bleed port) Almost looks like there should be a hose on it. I reviewed the service manual to see if I could find what it was, but saw nothing on it. I can get a pic of it and post it, but was wondering if anybody knew what this fitting was for?