Temp gauge goes to full at 120 then oil symbol comes then overheating symbol then after turning off a couple of times and driving it goes to 120 again and then down to 90
I would check the thermostat first. Remove the thermostat and place it in a pan of water on the stove. Place a thermometer in the water with the thermostat and slowly increase the temperature until you have reached 194 degrees Fahrenheit or 90 degrees Celsius. Watch closely for the thermostat to open slightly. If it opens then the thermostat is good. If it does not open, replace it. Try that first and see what you come up with.
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
SOURCE: my audi a6 keeps overheating at leat thats what
another difficult one to diagnose without car in front of me iam afraid ,could be anything from a head gasket to a partially blocked rad caused by no ANTIFREEZE ,try it again and turn the heater on max heat and fan on max and see if runs hot then if its ok ,let engine cool and put about 200grms of caustic soda in rad and run it for half hour ,let it cool and flush out the system with a hose pipe .then refill with water and try another drive ,if its ok then refill with antifreeze ,if its not try the caustic again .if that doesnt work trade it in quick
SOURCE: coolent system fault symbol Audi A6
1998 Audi A6 2.8
It could be that the thermostat is stuck in the open position thus providing maximum coolant flow through the engine when the engine is still cold, ie from a cold start. (The thermo should close when the engine is stopped and cold and it opens up once the coolant temp increases and the engine has been running for a few minutes.) Once the engine is hot maximum coolant flow between engine and radiator is normal.
Do you also find that your heater takes a while to provide warm air to the cabin in winter when you notice this condition?
If you do not know when the thermostat was last changed then I would suggest you change it. ( If it malfunctions and sticks in the closed position you will really have a problem). The radiator/engine coolant could no doubt do with a flush and change in any event as it should be done every 2 years. If you don't know when it was last done - do it. Cooling systems tend to be a neglected part of essential vehicle maintenance.
Cheers
Sean
Voluntary contributor.
SOURCE: I HAVE A AUDI A6 98 MODEL ,ONE OF THE WATER PIPE
THIS IS AS IT SHOULD BE,the temp should rise after about 1 to 2 miles,VW group engines have very little water in them compared to some other makes and should get to "operating temp" far quicker than most other cars.as long as your not overheating/overcooling,your gas mileage will be at its optimum.
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