Automotive testing experts analyzed expansion vessel lids using a specialized method to determine their effectiveness in real driving conditions.
The evaluation covered caps used on tanks installed across all VAZ models, with exceptions for Vesta, XRAY, Largus, and the classic series. Samples were acquired online from sellers across Russia to ensure a wide range of options.
This piece is presented by a person who holds foreign agent status in the Russian Federation.
The lid serves three key purposes: prevent liquid splashing, maintain system pressure so the liquid does not boil during heating, and admit air into the tank to avoid vacuum formation.
Results showed that only two lids could meet all three objectives, and even those were not flawless. One lid that fully passed the tests is the AROKI 332080, sourced from Dimitrovgrad. It should be noted that the assessment refers to a specific sample, and readers should not judge the entire product line by a single mark.
Additionally, one lid failed to hold pressure, meaning the engine could experience boiling even under light loads. The article then reviews which other lids did not pass the tests and which ones can be used safely in practice.
- Detailed findings are available in the Drive section published on In contact with