My 1997 Jeep TJ Wrangler seems to have the input through the heater core on the bottom 5/8” tube and output is the top 3/4” tube. I am thinking the 5.7 Hemi truck water pump output tube is the steel line and the input is the screw in adapter right above the lower radiator hose. I am going to connect them this way and see what happens. I’ll just need to adapt the Jeep’s 3/4” heater core output down to the Hemi’s 5/8” input at the water pump...