Pressure Relief Valve In Cap, Checking
WARNING: This page is about a different car, the 2015 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
 Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
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-- Position the :VAG1274B
with the :VAG1274/9
on the cap.
-- Generate pressure with the cooling system tester hand pump.
- The pressure release valve must open at 1.6 to 1.8 bar (23.2 to 26.1 psi).
-- If pressure relief valve does not open as specified, replace the cap.