How can I fix the temperature fluctuations in my Audi A4?

I've noticed that the temperature in my Audi A4 is constantly fluctuating, even with the AC turned off. It can go from hot to cold within a matter of seconds. What could be causing this issue and how can I fix it?

It sounds like there may be an issue with your thermostat. This component controls the temperature in your car and if it's malfunctioning, it can lead to fluctuations. I would recommend taking your car to a mechanic to have it checked and potentially replaced.

Another possibility could be a problem with your car's heating and cooling system. If there is a leak or blockage, it can cause the temperature to constantly change. I would suggest having a professional inspect and clean out your system to see if that resolves the issue.

I had a similar issue with my Audi A4 and it turned out to be a faulty sensor. The sensor was giving incorrect readings to the temperature control system, causing constant fluctuations. I would recommend having a diagnostic test done to pinpoint the exact issue.