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Message: <blockquote data-quote="skidsteer.ca" data-source="post: 5854" data-attributes="member: 307">BobThat hose you speak of is likely where the hot coolant returns to the bottom of the engine while the thermostat is closed (engine still warming up)You want to take your hot supply from just below the thermostat and return it to the bottom of the engine.I took my hot from the thermostat housing and made a 3/8" restrictor T and put it in the line going from the thermostat to the bottom of the engine.The restrictor goes towards the thermostat in this line and the return from the heater goes into the oposite side of this line into the low pressure area created by the restiction.Look at the photos in 853 heater install. I did have to access the back of the engine in the "mice only" area to connect the return line. This was a Isuzu, but yours is likely simular.Ken</blockquote>