2019 dodge ram

There is some gunk in my coolant, what causes this? I attached few pictures. Sometimes the exhausts smells like very strong gas (some said it was normal), the coolant fan is also loud sometimes (some threads said it was normal). I mainly only owned diesels, this is the first gas 5.7! Any help or...

We drove from Indiana to Alabama this past weekend and about 2/3 of the way down here, we hear a sound that sounds like a pressure release every 5-8 seconds while driving with the air conditioner on. we stopped and turned the air off and didn't hear it. Turned the air back on and after a very...