I have a 83 chevy 3/4. it used to have a 6.2 litter in it and replaced it with a Gm crate motor. the problem is It has a 4 core radiator in it along with a new heater core. I am hardly getting a heat from it I replaced the thermostate with a 195 the same one that was in it and still hardly getting any heat. I have no clue what is wrong witch i dont think nothing is wrong. What can be the problem any solutions. colin Save the whales Harpoon a fat chick.