The fan is not coming on while the ac is on making the ac blow hot air until I start driving then it cools down. Once I come to a stop it’s right back hot and the whole time the fan still doesn’t come on even if the temp reaches 230

Coolant is disappearing from the reservoir immediately as I fill it, No visible leaks from the truck anywhere. I'm not seeing milky oil when checking it so i don't believe it's a head gasket issue, I have no idea where my coolant is going. When i start the truck it sits on cold on the temp gauge for a good few minutes without moving then quickly shoots to overheating.

I have a P2681 code that I cannot reset. The 3way coolant bypass valve and thermostat has been changed, what next?

Coolant odor with no leaks.

I’ve replaced all relays fuses engine coolant sensor coolant temperature sensor and the fan itself it will come on once in a great while when the truck isn’t even warmed up but never to keep it from getting hot

I smell coolant in the cabin

I have changed the radiator itself, the fan, it has a new trans, I can’t even count how many thermostats! And still it overheats it I have to slow down and speed back up again…. Like at traffic lights or stop signs in the neighborhood etc. if I stay kind of steady speed it’s not so bad. It’s getting worse with the rising heat outside of course! I’m out of ideas!