No heat. Help!!

[rscam]

I have completely rebulit my truck and have no Heat. First I had a 160 degree TS and I thought that was to low so I put a 195 in it. Still no heat. I mean not even a little. I have checked the cable through the grommet at the firewall and it is hooked up and functional. That door is AIR/FAN and moves about 20 degrees from one end to the other. The HEAT selector cable is also fucntional. and the DEF works correctly from floor to Defrost. I have the supply side of the (NEW)heater core comes from the water pump and the return goes to the top right corner of the radiator. The return is on top of the HC and the supply is on the bottom of the HC. I have a 4 core radiator. The only thimg I can think of is to put the supply on the intake before the thermostat so I will get heated coolant from the engine not the cooler side of the thermostat. Anyone have any other ideas?