Question about 2004 Audi A4

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Audi A4 coolant problem topping up coolant but still over heating and more coolant needed

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Many cars have a bleeder valve to let out air pocket from the cooling system. Fill the radiator, with the cap off, let it idle at about 1500-2000 rpm's until it reaches normal operating temp. on the gauge, then the thermostat will open allowing the coolant to circulate throughout the engine and radiator. any air will then be gone after about 10 minutes at a fast idle. Top off the coolant, replace cap and recheck the level after a short drive of a few miles and has time to cool.
If there is enough trapped air in the system, you will have no heat. The heater box loves to trap a lot of air in it as its like a tiny radiator itself.

Posted on Sep 23, 2009

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Posted on Jan 02, 2017

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The light is flashing on the top left of the 4 squares. Its 1996 Audi A4 1.8 auto. What does it mean


Is this you instrument cluster? vtraudt image
If so, top left would be coolant temperature warning light.

What is the coolant temp gauge reading?

I would suspect faulty coolant temp sensor.
Also check if your coolant reservoir sensor (plugged into the bottom of you coolant tank) is plugged in (I often forget to plug it back in; the retainer also easily breaks and the plug can slip out).

www.kraftwerkturbo.com
www.regulatorfix.com

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1 Answer

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Diagnose the problems-- as winter is coming soon

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1 Answer

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1 Answer

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1 Answer

I have a 1999 Audi A4 Avant, I keep having to top up the water reservoir, what could the problem be?


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1 Answer

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1 Answer

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1 Answer

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1 Answer

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