So I currently bought an 01 prelude like 3 days ago everything was fine until my temp gauge started getting up high. The previous owner said it had at least another 2k miles before the next oil change, coolant was a little low so I added more when I got home. Now everytime I drive it it’s normal but when I’m at a stop light or just at a complete stop it’ll slowly rise up and go back to normal when I hit the gas. Any advice what it could be?!!! I would really appreciate it!!! Quick edit: this pic was before it was turned on!!!