in your case it looks like it's set up for heater hoses the connection on the thermostat housing appears to be above the thermostat, as for a bypass most of the time they are to prevent air locking of the pump or thermostat,Detroit had petcocks on the thermostat housing never had to open one until one night we blew a radiator pipe coupling hose on an 8V71 in a bus it had two separate radiators, two water pumps, one filler cap couldn't get it to take water on the closed side it would try to get hot idling, after myself and the field mechanic had ran out of things to try the man that hauled fuel for us walked by an opened one of the petcocks it swallowed the water and we were able to fill the system one of the pumps was air locked never had that before ,but the radiators were mounted above the engine one on each side
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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