Audi Filler Cap on Coolant Can Fool You

This bulletin applies to all 2012-2021 Audi models. The customer may note that the warning light is on with low coolant level or a coolant leak is found under the vehicle front. 

The pressure relief valve in the filler cap of the cooling system can give the impression that the valve malfunctions. Coolant marks around the filler cap or the coolant expansion tank do not necessarily indicate that the cap is malfunctioning. Check the filler cap, according to Elsa. If the filler cap passes the test, do not replace the cap. Continue fault finding.

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Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

About the Author

Mike Mavrigian | Editor

Mike received a BA degree from Youngstown State University in English Literature with a minor in Journalism in 1975.