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Message: <blockquote data-quote="Larry Holmes" data-source="post: 1049512" data-attributes="member: 73179"><p>Years ago Prestone made a T joint to splice into the heater hose specifically to backflush the heater core and the radiator. The kit came with a deflector tube that you'd stick into the radiator fill opening to allow the water pressure from the T joint to be directed away from the the vehicle.  The plastic T connected to a garden how and you ran the engine with the water running through to flush every component of the system.  As I recall the T was yellow plastic and the cap on it was black.</p></blockquote><p></p>