[Bowtie67]

I am not sure if your fans are running consistantly and they shouldnt be, one of the things you can do during the cool weather is to block off some of the radiator in the front, Take a piece of cardboard the width of the radiator and cut a V-shape/circle/square in it to allow some air like you see the big truckers due during the winter and that should get you some warmer coolant to the heater core, it also doesnt help having the hoses reversed. I have a bit of the same issue in mine, I have a new heater corp & hoses are correct, and I have a big aluminum radiator with a 185 thermastat and it doesnt get very warm inside either during cold days, but for me it's not an issue becasue I don't drive it during the winter.