2005 Dodge Magnum Ve Recently Been Traveling Lot Long Distances Experiencing

I've recently been traveling a lot for long distances and have been experiencing issues with overheating. It started with a check engine light and what looked like an electrical issue warning. Upon turning it off an back on, the electrical light went off. Later, I noticed overheating while stationary and the fans running loudly, almost like the fan turbo on a diesel truck. I noticed fluid spray and air leaking from what looks like a bleeder valve at the top where the radiator hose connects to a resivoir and the engine. I refilled the coolant and sealed off a leak in that resivoir, which worked for a few days and now it starts to overheat at times while speeding up.