I have a 2002 HR Ambassador with a Cummins 315 ISC Engine. The coolant reserve tank has cracks in it and slo-o-oly leaks the coolant. I have tried to put 2 different coatings on the outside of the tank with no luck. They both cracked off. I tried to get a new tank from Monaco (HR) and they like them very very much (almost $200) for a nylon tank) and they were out of stock! Does anyone know how I can either fix this one or where I can obtain a replacement? I would appreciate any suggestion you could offer.