Pressure Relief Valve in Cap, Checking
WARNING: This page is about a different car, the 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
 Courtesy of AUDI OF AMERICA, LLC
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-- Position the :VAG1274B
with the :VAG1274/9
on the cap.
-- Generate pressure with cooling system tester hand pump.
- The pressure release valve must open at 1.4 to 1.6 bar (20.30 to 23.20 psi).
-- If pressure relief valve does not open as specified, replace cap.