Hello I am new here. I am not sure if this is right spot but I just installed a new inferno heater in my 2020 Viking. When I installed it I clamped off the hoses before I made the cuts into the coolant lines and I left off the top hose in heater core ran the Viking until I had coolant flow out the port then put everything together. I did bleed the system ( ran engine for some time and took it for a ride come back and take off radiator stopper and top up coolant) I do get heat out of my heater but it takes longer then it should I am thinking I still have air in system. I emailed the company that makes the heater and they told me to try pinching off the top rad hose to force coolant up through heater core but when I look at the radiator both hoses are at same level in radiator how can I tell which one is the upper hose ?