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Red overheat light

We have a 2005 Audi A4 Cabriolet 2000cc Problem is the red overheat light and alarm comes on in a totally random fashion - sometimes on starting, sometimes when driving, sometimes we can get three days with no alarm at all then it's back to alarming again. Most times the red light stays on for a few minutes then goes off, in one instance it stayed on for the whole trip of 250k, we checked the radiator level, it was fine. Engine temp has never gone above the centre position. We have had the radiator coolant tank replaced but the problem is still the same. We would appreciate some advice as it is very disconcerting to have the alarm light on for a whole trip!

Posted by Anonymous on

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

tripletauto
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SOURCE: car won't start wants to turn over but nothing.

sounds like you have a blown head gasket this would explain loss of coolant and running poorly excessive smoke.

Posted on Nov 10, 2008

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SOURCE: 2005 Audi 1.8 a4 check engine light on and car now spudders??

FYI also when you get those codes you can look them up and get their description at http://www.check-engine-light.com

Posted on Jan 03, 2009

  • 36 Answers

SOURCE: 2003 AUDI Quattro 3.0 check engine light(MIL) stays on

Before you do anything else you are just going to have to read the codes. So buy the maintance book at autozone,locate the little juction box on the fire wall and jump the terminals with a little wire. Then of course sit in the drivers seat turn on the key(do not start) and read the blinks. Then you will know what the problem is.

Posted on May 06, 2009

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SOURCE: Alarm oil sensor in my Audi A6 1,9 tdi -2000.

sounds like a faulty oil level sensor i,v replaced them in the past you need to get it checked first because the sensors aren,t cheap

Posted on Aug 02, 2009

VAGMatt
  • 31 Answers

SOURCE: Code P0118 on Audi A4 - Related to Ignition Coil Problem?

Hi, the sensor on the engine (right at the rear end of the cylinder head) has two separate outputs. One drives the temperature gauge and the other provides data for the engine control unit. The output for the engine control unit is almost certainly faulty and the sensor will need to be replaced. It isn't an expensive item and's not time consuming to replace (1/2 hr) - so you could ask Audi to do it for you when they replace the ignition coils.
Hope that helps Matt..

Posted on Nov 23, 2009

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