Hey everyone, new member here! Hope you can help me with a overheating problem I'm having! I know this subject has been addressed several times throughout the years, but my situation puts (I think) a new twist on this age old problem that doesn’t seem to disappear completely! I have a 2010 GL1800 with a 2018 CSC Viper trike conversion, but this issue started before it was triked. My issue is that the Goldwing will overheat only whenever I'm trying to climb a mountain road (paved of course!). I have had it happen in Colorado, Montana & Wyoming. I'm aware of the speeds when the radiator fans kick in and out (mine is at ~18 MPH). The fans will kick in during stop and go traffic just like they are supposed to with the temp needle only slightly moving above normal. I've tried several different combinations of air flow speeds (40 to 60 MPH), higher RPMs (4000 to 5000 RPM) and low air temperature (low as 40deg) and it still overheats! And yes the radiator is full! I can ride on the flat interstate or two lane blacktop roads all day at 50 - 80 MPH in 100 degree heat, and the temp needle doesn't move even a tick! But ask it to climb a mountain, and the temp gauge climbs right along with it! Each time it get too high, I need to pull over and wait for the temp to go down before continuing up, or even turn around and go back down. It has puked out coolant a couple of times during these episodes. When I do make it to the top, the temp needle drops back to normal as soon as the road levels off. I've had the system flushed a couple of times, checked for blockages/restrictions, checked the pressure (good) and even replaced the radiator cap, but nothing seems to help! I’ve talked to several other Goldwing riders on these mountain roads and they say they’ve never had this same problem! Hope you can come up with a solution, because I would hate to restrict my riding to only the flatlands!