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Message: <blockquote data-quote="skidsteer.ca" data-source="post: 4972" data-attributes="member: 307">I'm in the process of adding heat to my 853. The Isuzu use a 7/8" hose that allows the water to circulate from below the thermostat to the cold return hose (big hose) from the rad when the themostat is shut. My heater will provide a parallel loop to and from the same points with 5/8 hose. ( I tapped a 3/8" pipe nipple into the thermostat housing, just below the themostat and will return the water to the lower/ cold rad hose)I was wondering if anyone knows if a restrictor is used in this appication? And if so, what diameter restrictor should go in the factory 7/8" hose.This would help force more coolant throught the heater core, however it must be big enough allow enough coolant to circulate in the block when the heat is shut off and the heater core circuit is not flowing.If not I'll install a valve in each line and do the trial and error thing.ThanksKen</blockquote>