Question about 2004 Audi A4

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My 2004 Audi A4 rises in temp to the 3/4 mark on the guage when I drive 65 for a period of time (20 minutes or so) and then quickly returns to normal when I slow down to 50 or 55 and then back up when I speed up. No over heating at lower speeds or idle.

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  • 138 Answers

Radiator may be partialy blocked, will overheat mostly on long uphills.

Posted on May 12, 2010

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2004 Audi A4 continued cooling system issues! HELP please!


The rising and falling temp gauge indicates a low water level in the cooling system as hot water is splashed against the sender . Have a pressure test done on the coolant system and find the leaks . Remember to check inside in the heater core as well. Have a compression test done to check for head gasket and cracks

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could be the faulty sensor is allowing the idle to rise at it thinks the engine is cold ? but again with so many of these questions i do not have a answer without a good look myself as modern day cars have so many variables unlike the old things i used to work on

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Audi 1997 A4 temp guage passes its mid-point then the fan come on, is this normal?


yes,the temp guage is a guide only,the sensor kicks in at the correct temp....

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I have an Audi A4 1.9TDi 2004. I was driving a distance of 25km and the car temp gauge went up twice on the journey and I got message on the dash COOLANT with a pic of a thermometer. I then drove 80km...


Make sure you uhave a good mixture of antifreeze it make the boiling point higher as well as the freeze point lower. Check the fans let it idle turn on the ac and wait and watch.If it gets hot and No fan comes on start there / thermastat The t-start should be open around 160-180 degrees you should notice it get to the threshhold then drop 10 degrees / heads check for water in the oil oil in the water .See if you can get a temp gun if every thing else checks good before you get into the wiring.

Apr 06, 2010 | 2004 Audi A4

1 Answer

My coolant expansion tank is overflowing after 20 minutes running


There could be a couple of reasons for this,

1. The thermostat could be stuck closed creating more pressure than normal. Your temp guage would show a higher temperature or you have another blockage in the system.
2. The expansion tank is too full.
3. The cylinder head may be leaking. If you fill the system run the engine to normal temperature with the radiator cap off, look for quite large bubbles coming out of the filler cap. If the head is badly leaking, they can be like a volcano. The temp will rise quickly from cold and the engine will overheat in a short distance.
It does seem odd that it would only spill over after 20 mins. Suspect that the expansion is over full first if your temp is normal. Let it run until it stops and see where the level is when the engine is cold.

Feb 17, 2010 | 1996 Mercury Sable

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Where is fuel temp sensor on my engine? audi a4 2.0tdi 2005


the fuel temp sensor is on the return pipe to the fuel filter,black 2 pin multi plug,

Jul 17, 2009 | 2004 Audi A4

1 Answer

Audi A4 1.8T Quattro 09/2003 Temp guage rises as


Could be thermostat this regulates the water flow around the engine to keep it cool sounds like it is sticking open when water gets hot!!

Jun 07, 2009 | 2005 Audi A3

1 Answer

Audi A3 2001 fan running all of the time, Temp guage not moving from start position and EML on? already replaced Coolant temp sensor? Any ideas?


ON ALL A4 MODELS AND I THINK THE A3 , THE ENGINE COOLANT TEMPERATURE SENSOR IS LOCATED AT THE REAR OF THE CYLINDER HEAD,WHILST ON SOME ENGINES, A SECOND SENSOR IS FITTED TO THE RADIATOR OUTLET PIPE...HOPE I WAS OF SOME HELP TO YOU....

Feb 24, 2009 | 2004 Audi A4

1 Answer

2003 audi a4 1.8t sedan temprature guage


You're talking about the coolant temperature right? If so, it's likely to be a coolant temp sensor. They're known to go bad on the A4, and they're only around $20-25 from www.ecstuning.com. If you replace it and the problem isn't fixed, no harm done - sooner or later that sensor WILL go bad. The result is that most likely your thermostat got stuck open and will need to be replaced.

Aug 30, 2008 | 2003 Audi A4 Cabriolet

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