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Message: <blockquote data-quote="brt" data-source="post: 83463" data-attributes="member: 2425"><p>I installed the Bobcat heater that sits next to the seat in my '99 763F. Since i did not know the orifice size on the bypass/crossover, I installed a brass ball valve in the crossover area. I think that I've found the sweet spot that restricts the flow enough to send sufficient hot water to the heater core. I also installed brass ball valves in the intake and discharge hoses of the heater core lines. They serve 2 purposes. Number one is that I can isolate the heater core during Summer to keep the heat out of the cab as well as being able to shut off the core if it ever leaks. Number 2 is that I can reduce the flow through the heater core a bit and that seems to allow the heat to build up in the core more. I'm no scientist, but it seems to work. Not a blow torch of a heater, but better than an open cab in a snowstorm!</p></blockquote><p></p>