03 Audi a4 quattro 1.8t.I recently replaced the oil cooler and it was the problem with thw oil and water exchange but now it continues to overheat.

Asked by Jan 28, 2015 at 08:39 PM about the 2003 Audi A4 1.8T quattro Sedan AWD

Question type: Maintenance & Repair

After replacing the oil cooler and flushing then cooling system the car was back in good shape until now....The car has been running great with the exception of me needing to flush the heater core. I finally finished with the flushing and decided to run one more can of flush through the system with the hopes of catching that last little bit of oil that was left over from the bad oil cooler. I allowed the flush to run through the system for a week averaging around 800 miles. During this time the was no problems with the cooling system, heater core ,none of that. So last night I decide to drain the radiator containing the flush and replace it with antifreeze. Everything went well . I bled the system drove apx. 25 miles checked it again and all was good. Well this morning on the way to work I looked down and the car was beginning to overheat. I pulled into the store to see what was going on and noticed that the water was boiling inside the cooling system. When I opened the resevouir to add water out came a lot of steam. O the way home I had to stop several times to refill the water.The coolant light was flashing this whole time and towards the end so was the oil light. The car is full of oil though. Im guessing the oil light was from the heat maybe? Don't know for sure. After  all this I thought that maybe all the flushes affected the thermostat so I took it out to see if the car would over heat with out it. And it dosent . Only when moving. You can drive 30 minutes at perfect operating temp. and the next second it takes off to the hot side. The water will be boiling when you stop and then it will go right back to normal....What gives???? Im constantly loosing water to but cant see a leek and its not in the oil.

1 Answer

Hello my partner has exactly this problem same car but 1999 have you found out the problem as we have no idea if so we would be very grateful if you could let us know or help us out kind regards

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