I have an A4 AUDI 1.8T my car is over heating , oil is finding its way into the coolant and the fan is not coming on, only when i put on the air condition the two fans come on.I also have an oil leak, but the oil leak sign is not showing up anymore, it use to.I only get the coolant sign coming up and its always beeping.The oil leak is coming out at the bottom of the car in front. I would like to have an idea what to do, and what parts i need to rectify this problem. I would appreciate your help. thank you

Most Audi's over heat for one reason. Bad cooling processes and equipment.

what does that mean?

Audi Cooling system. Is under pressure... if hoses (heater core) are plugged or the thermostat fails or its a hot day and the cool fans arent running you are likely to experience the dreaded AUDI VW cooling issues.

First things First. Check the coolant and OIL level.

any white sludgey stuff in the oil (popped head gasket)
low oil.. could be over heating your engine.

Freezing cold day when it is over heating.. frozen coolant


Thermostat issues are hard to determine and So cheap to rectify...
ask yourself this? when was it changed last if not in the last 60 K and you are having an issue. REPLACE IT.. Now you can trust it again.


Over heating issues after replacing a thermostat or having a low coolant issues and you have filled it again.. its likely you have the double dreaded AUDI AIR BUBBLE.

I have worked out a few by letting the engine warm up and cool down repeatedly 6 - 10 times..
By WARM up I dont mean over heat and destroy.

Ever time it heated to normal operating temp the thermostat opened and moved some air around the loop.
when the system cooled i added a little more audi coolant to the tank and repeated the process eventually the bubles come out enough to drive.


be smart take it to teh end of the drive and back and check the temp, oil and coolant.
park it.. let it cool
next drive take it down the drive, to the end of the neighbors drive and back.. re check the temp, oil and coolant.. see the pattern?

DO IT.

lol It works for me.. Be patient. double check yourself before driving. Double check it again.. like you need to start the task from the finish.. you will be surprised the things you find you missed. : )

Cheers and good luck.

If the coolant and thermostat is over 2 year old then it is time to replace thermostat and coolant flush to get all the deposit out.

Flush and fill the coolant reserve tank slowly. I recommend put the car on an oil change ramp to prevent air pocket.

can be loosing water or not holding pressure[coolant bottle or cap],top gasket,crack in block,oil cooler leaking into coolant,faulty heat gauge or sensor.hope this helps

could be sender or pump. do not run the engine until you're sure you have a good pump. Does it blink on and off--coming on mainly at idle? This would be normal for an old engine. If it stays on and the pump is bad, you will ruin your engine. You can try replacing the sending uniot, as that is cheap compared to the pump, but don't run it long to check new sender. If new sender stays red, shut down and replace pump.

audi a4 1,8T radio code

most likely a air bubble in your system. get it up to temp open up your reservoir use something that will fit in the opening and put coolant into it rev engine up a bit until you see bubbles coming up. when you did the engine did you replace cooling system parts like t-stat or water pump? purging the system of air will take a little while good luck hope that helps

thermostat, waterpump ? also one fan is for engine. the second fan should power up after turning on ac

shack

Sounds like blown head gasket (or worse) still to me.
Remove oil filler cap and look for grey oil.
Never use water these days but special coolant. Water makes vapour spots and cause block cracks, worse then blown gaskets!!!
vapour does not cool very well.
Look like you have cracks already.
Take a compression test if possible. But might not show op at that temperature.
The gauge indication troubles me.

You probably have a leak in your oil cooler. This is causing the oil to bleed into your cooling system causing the "thick brown liquid". This in turn will also cause your engine to over-heat since the cooling system is contaminated.

head gasket!