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My Audi Q5's coolant light comes on even though it seems okay

Audi Audi Advice Audi Q5 Audi Q5 Advice Audi Q5 2012
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My 2012 Audi Q5's coolant light comes on the dashboard, telling me to stop the engine and check coolant. There's no obvious leak visible. What could be the causes?

The best way forward here is to take the car to a workshop that knows Audis and have them pressure test the cooling system. Modern cars have sealed coolant systems, suggesting that they shouldn’t lose any coolant at all. The reality is a little different, and what may have happened is that your coolant level has been falling very slowly perhaps over a period of years until the level is low enough to trigger the warning message.

By pressure testing the system, any leak should become visible and can be fixed. Water pumps, radiators, heat exchangers and the network of coolant plumbing that makes up a modern car can all develop leaks. Sometimes the leak is so small, the coolant evaporates before it ever hits the ground which is why there’s no tell-tale puddle under the car each morning.

Don’t automatically jump to the conclusion that your car has a blown head gasket; there are lots of ways for coolant to escape, which is why it’s wise to keep an eye on the level on a weekly basis.

Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.

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