Audi A8 Quattro Problem Report

Audi A8 Quattro Check Engine Light and/or Engine Overheating Due to Failed Thermostat

(37 reports)

The thermostat may erratically stick open or closed. The can result in illumination of the Check Engine Light and/or engine overheating.

Engine suddenly overheated significantly without any previous warning or coolant leakage. Failed thermostat replaced. -
Thermostat failed closed -
Check engine light. Codes said failing thermostat. $871 to fix. Recommended same time do the timing belt, serpentine belt, and water pump with the thermostat, quote, $2065. -
Check Engine light on...told by local mechanic that thermostat is stuck open (or so I'm told)...also told it's very expensive to fix, since the whole front end needs to come off to get to fix done. -
I had my Audi A8 Quattro 4.2L Parked in my heated garage for 6 weeks i drove it out and after about 15 miles it started running above normal temperature i had to turn the interior heater on to maximum to get the temp back to normal my audi main agent said i needed a new water pump and thermostat at a cost of £1675.53 i was not happy this obviously must be a manufacturers design fault i mean you would not think a £57000 car would need a water pump and thermostat after a mere 26000 mile and it is not soughted yet as i think Audi should rectify the problem or at least meet part of the cost. -
Coolant level is full. No leaks. Temp gauge moves to red after 7 miles driving from cold start. -
Warning light comes on if it is cold out and stays on for about a minute. As the weather became hotter it then began to come on while driving and the temp gauge stats to spike. Opening the reservoir cap and release some pressure and it comes back down and runs normal temp. This happened twice, which makes it appear that the thermostat is stuck closed and is released with the pressure. -
It just started to overheat. -
Engine overheats unless heater is on HI. Not yet repaired looking for a reasonable and qualified repair technician -
Car periodically seems ( per the gauge ) to be running too warm Now the check engine light came on Mechanic told be previously that it's an expensive job to fix and just get used to topping off the coolant from time to time -
Thermostat stuck in closed position, engine overheated. Dealer replaced thermostat. In order to do so had to remove timing chain and water pump to get at thermostat. Replaced timing chain and water pump as long as it was all torn apart. Expensive repair for a thermostat. Thought they normally failed in the open position! -
The the 2004 A8L with 64,500 suddenly overheated. I drove it home (about 3-4 miles) quickly and will bring it in or have it towed in for service tomorrow. -
my a8 qquatro overheats but does'nt read it on the gage. i had a new waterpump installed> it leaks a little somwhere on the left when parked and turned off and the cooling fas don't continue to cool it when turned off. don" 't know what to do please help. -
Failed Thermostat -
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does the picture on the message board with a thermometer in water mean thermostat problems?
Overheating even on idling, fan working ,no coolant lose.
I put my car in reverse and it didn't even run back and the I gave it a little gas and it did...