My audi a6 2.8v6 quattro water tempreture keeps going above 90 to 100 every time i hit traffic for more than 5min. Recently changed the water pump,radiator,and engine oil from 5w40 to 15w40 shell helix oil. The car was bleed but no positive result yet. What could be the problem? What are we missing?

Bad shop.Go to a shop that can set the audi "markless" timing.

When you get a vibration at high speeds when you hit the brakes the rotor/s are very slightly warped. Depending on miles, you may be able to get them turned / surfaced. One other thing is if you don't drive it to much, they can rust and cause the same problem. Hitting the brakes a few times on the highway will smooth them out.

there could be a engine timing adjustment or did you check the head gaskit

Engine oil capacity with oil filter replacement = 6.0 litres.

Oil grade for 2001 Audi A4 Quattro 2.8
1. SAE 5W-30 / 5W-40, VW 502.00 - all temperatures.
2. SAE 10W-30 / 10W-40, VW 502.00 - all temperatures.
3. SAE 5W-50, VW 501.01 - all temperatures.
4. SAE 10W-50 / 10W-60, VW 501.01 - all temperatures.
5. SAE 5W-30 / 5W-40, VW 501.01 - bellow +15 Celsius degrees.
6. SAE 10W-30 / 10W-40, VW 501.01 - bellow +15 Celsius degrees.
7. SAE 15W-40 / 15W-50, VW 501.01 - above -15 Celsius degrees.
8. SAE 20W-40 / 20W-50, VW 501.01 - above -15 Celsius degrees.

LONGLIFE engine oil:
1. SAE 5W-30, VW 504.00 - all temperatures.
2. SAE 0W-30, VW 503.00 - all temperatures.


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MOST OF THE TIME BEST TO LET DEALERSHIP REPROGRAM IDLE BECAUSE STALLING AND WAITING FOR CAR TO RELEARN TO IDLE.CAN BE DANGEROUS.FOR A CAR STALLING OUT AROUND MOVING TRAFFIC.

I am not sure if you have the 90 or the 90 Quattro.
Click on the below Links.
The first Link is all the Diagrams on the Timing Belt for the 90 Model.
The second link is all the Diagrams on the Timing Belt for the V8 Quattro.
Before clicking, let me know if this helped you.
For the 90 Model:
http://www.2carpros.com/car_repair_information/year/1993/make/audi/model/90/1993_audi_90_timing_belt_diagram_marks.htm

For the V8 Quattro:
http://www.2carpros.com/car_repair_information/year/1993/make/audi/model/v8_quattro/1993_audi_v8_quattro_timing_belt_diagram_marks.htm

no need to change the starter unless its giving trouble but by all means change the water pump as its a better job in the long run

check output voltage of altenator if its above 15volts change it

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!!

a rubber one,should be changed at 50-60,000 miles. Audis recomendation is like 90,000 I think but have heard of them going much sooner than that. A preventitive Cam -timing belt job way cheaper than doing it after it breaks and ruins valves and cylinders!