No heat

The ac blows out extremely cold and full power but when I switch over to heat it goes to about 50% coming out and is cold. I took a hose off and air came out and I had heat after that but still not full power. Took the blower motor resistor out which was corroded. More on one side. Replaced that and still the same and now no heat again. Blend door in the center looks to be working fine Any help would be greatly appreciated

I checked the reserve and the level there looks good. Where else can I check? Thank you

Could I have air in the system? Or would my heater core need to be flushed?

Ok I’ll try that first Thank you so much

I can’t find a cap on my radiator

I removed the hose coming from the reservoir again and I heard air again then antifreeze started coming from it. I put it back on and put antifreeze back in the reservoir around halfway. Don’t c a fill line on this one. I have heat now again and a lil more flow but still no where near as much as the air.

can’t find a cap on my radiator

i have a 2014 6.4L gas and sometimes it will blow hot and cold air and other times it won't what is the prolbem and what should i do