Question about 2004 Audi A4

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Audi a4 1.8 42k miles suddenly running rough at idle and getting hot Despite heat, radiator fans not turning. Thanks

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It is most likely the the Coolant Fan Control Module and is located in the left front of the engine compartment next to the radiator.


Audi a4 1.8 42k miles - 33e9351.jpg

Posted on Aug 26, 2010

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Run the engine and look at the header tank , is there lots of air bubbles coming back out of the water if is then the head gasket may have split and that is down to either a can of Radweld or a strip down repair

If the radiator is not uniformly hot them I would go for that as your problem

Normal operation is that the engine starts the thermostat is closed , engine block heats up and opens water starts to circulate around the block

So to check that you need to fill the radiator with cold water run it for a few minutes check the bottom hose it should be cold

The stat opens and the bottom hose should get hot as the water from the block is pumped into the radiator for cooling.

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In which case the bottom hose should go from cold to warm to hot

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