Car Owners Hub UK - Built by Drivers, for Drivers

Greetings, I came across no threads or forums pertaining to problems. The squeaking sound is most noticeable when I accelerate and decelerate in my Audi A5 B8. It seems like a belt is slipping, but I've checked the belts and brake pads and rotors and they're all good.

2. It takes my car a long time to reach operating temperature, and even after that, if I drive at 40 mph or more for 20 minutes or more, the temperature drops and even reaches 50 on the gauge. As a result, even with the heaters turned on, cold air comes out.

I can only seem to upload pictures; does anyone have any ideas how to add a video as well?

Greetings! A worn-out bearing could be the initial source of your problem.
The second issue you might be experiencing is that your thermostat is probably stuck open. In comparison to Audis, Vauxhalls and Opels are far more familiar to me, so I can't say for sure.
I hope this is useful.

I am grateful for your assistance; it sounds like a bearing. Thank you so much.