Squall21

Lately when I switch to high beam from low beam, the high beams are bright but once I finish switching them and let go of switch they dim a bit and less concentrated. Any ideas or suggestions, I'm running SilverStar 4000k bulbs.

Can I do the thermostat myself or do I need to see my local mechanic, also already changed the coolant cap already cause it wasn't sealing properly.

My coolant level drops after a week, and when sitting in traffic it almost over heats until I move again. No idea if its leaking somewhere or evaporating. Also no heat in the winter and smell coolant when fan on.