Hello everyone and happy thanksgiving! I’m having an issue, I have1999 GMC Yukon with barely any heat at all, especially when driving. I have a brand new radiator from champion aluminum radiators, I think a 195 degree thermostat? A new heater core, and new temp mature control actuator, also new heater hoses all through out. The hvac box seems to be hot like there is flow in the heater core with hot coolant, but out of the vents to barely any heat and driving it’s honestly just cool. What am I missing here? If the heater control valve is stuck wouldn’t that not allow any coolant to enter the heater core?