Recently lost heat in the cabin of the car

I recently lost heat in the cabin of the car. It was okay one day not there the next. I only blows continual cold air. I recently replace the water pump, duo valve/heater control valve, block temperature sensor, thermostat, checked all fuses, flushed system and have not replaced the auxiliary water pump yet. Coolant has been replace and is staying a the correct level. Also replace the clutch fan just in case and am at lose at what it could be. I ruled out the heater core due to the fact there is not smell of coolant when the system is on. I ran the diagnostics and clears all the codes along with changing the version code from OOP to P10."not sure if this the right version for the care put I thought I'd just try it. The engine doesn't overheat but it doesn't run at its normal operating temperature at 80c. It fluctuates tween 100c and 80c. I am curious if the auxiliary pump would be causing these issues. I ran the car until it was at full temp and check the hose entering the firewall on the driver's side, which was quite warm and the hose entering the heater control valve on the passenger side which was cold. Not sure what else it could be at this point. Please help. Thank you Craig O.