Just bought my first DSM and having a bunch of problems

[Constant_Project21]

Sounds like a classic dsm to me. Since you're new, here's a fitting phrase to sum up owning a dsm, "shit happens." Less "shit" will happen if you keep up preventitive maintenence, and fix problems when they happen, not when you feel like it. All the stuff you got going on is easy to fix, the boiling coolant happened to me to when my temp sensor went out, car just overheats. Simple fixes, which everyone has pretty much covered.