Hi everyone, I have a 2017 Skoda Octavia 1200 TSI (the older shape) and I have a problem—I live in a hot country, and the radiator coolant drops every few days (a significant amount), and on hot days, it even reaches the minimum within one or two days. There is absolutely no leak around, the reservoir tank is not cracked. I don't know where the coolant is going. Has anyone encountered this before? Does anyone know what to do? Thanks everyone!!!

I suspect that you have a failed expansion tank cap. The scenario is that the expansion tank gets over pressurised and then the car overflows the coolant out of the emergency overflow at the side of the tank. The expansion tank caps have a pressure relief spring against a plastic shaft. This work hardens and stops the cap from relieving the pressure.

In most cases, a new pressure cap will fix your problem.

5 hours ago, varaderoguy said:

I suspect that you have a failed expansion tank cap. The scenario is that the expansion tank gets over pressurised and then the car overflows the coolant out of the emergency overflow at the side of the tank. The expansion tank caps have a pressure relief spring against a plastic shaft. This work hardens and stops the cap from relieving the pressure.

In most cases, a new pressure cap will fix your problem.

thank you very much I will check this out!!!!