My first car is a eu st202! <3, OMG i did it! Options

[Fidelity]

Hello celica bros! Two weeks ago, i bought my first car. I looked for a nice celica for months and finally a beauty of a st202 popped up. My stephdad helped me buy it and it was in a really good condition. I got it cheap, its a 94 coupe and its hands down the most beautiful thing i have ever owned. Im 28, live in Norway and im still a learner, im getting my license soon and a celica gt was my absolute dream car. Well dreams apperently come true! Im happy i found this forum and hope i can ask you guys for some advice if something comes up!

[Fidelity]

There are already a few hopefully trivial problems, please share some insight if you've had similiar problems. Im hoping to fix all of them as soon as i can
1. The heat on the ac does not work, but i think its the thermostat cuz the engine runs pretty cold.
2. The oil level lamp (Yellow with the squiggly line underneath) switches on and of while i drive. Im doing an oil change anyway, but the oil level is up to max on the dipstick.
3. There is a bumping noise from the rear wheel passenger side during right turns.
4. It also has a killer aftermarket stereo, but i need a good amp to power it since the previous owner needed it for her new car. Maybe you guys could help me pick one out?

This post has been edited by Fidelity: Oct 20, 2017 - 5:39 AM