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Message: <blockquote data-quote="Terexnorthfl" data-source="post: 69641" data-attributes="member: 9880"><p>On the machine that we service with cummins engines. There is a port on the pipe that connects to the lower rad. Hose. That would be return. And the port that shows in the pic with the temp sender is the pressure to the heater core. Also, we have a reducer in the line from the pressure to the heater core. This helps with pressure spikes and not bursting the core. But if you have a good radiator cap(that functions at the correct pressure) you should be fine.</p></blockquote><p></p>