Audi
S4
19

Check Engine Light and/or Engine Overheating Due to Failed Thermostat on Audi S4

Problem Description and Possible Solution

The thermostat may erratically stick open or closed. The can result in illumination of the Check Engine Light and/or engine overheating.

Problem Data
RepairPal Verified
Average mileage: 50,404 (12,700–89,000)
8 model years affected: 2004, 2005, 2006, 2007, more2008, 2009, 2010, 2011
19 people reported this problem
Comments
Viewing 1 - 9 of 9 comments
Car indicated that it was overheating and to stop the engine. Took to dealership under warranty and they've indicated that it was a problem with the thermostat.
Thermostat failure, water pump and thermostat replaced. Front part of the engine needs to be torn down to make repair. $$ labor charge.
Overheating, warning to shut car off due to low coolant. My coolant is fine and fans are too. Thermostat is the culprit.
A4 overheating, mechanic stated termostat needs replacement. cheap part, high labor... 5.8 hours. I asked if water pump should be replaced at same time and was told no necessary.
Usual plastic bs thermostat on the new 3.0L engines snapping and getting stuck in closed position. Audi replaced it after fighting with AOA about it, since it's a common failure and they refuse to make a proper metal thermostat that won't just snap off because it's plastic and brittle after being in hot coolant for thousands of miles.
Driving normally and warning light came on. Well maintained, dealer certified car that was purchased as CPO and I'm glad I was covered under warranty. Dealer said its a common problem and knew exactly what was up. Also replaced my fans but I didn't know why the fans broke down. Cost me only $75 because I was covered.
car ovearheating, loud fan sound.
Thermostat on my 2011 Audi S4 failed. It got stuck in the close position and the car overheated. Since it was outside the warrantee, it was a very expensive repair.
Front fans come on full blast, AC shuts off. Temp gauge climbs up.