Need to bleed the coolant on an Audi A4 - A4 Audi Cars & Trucks

If u take the cover of the plenum chamber, or where the plastic cover is for the battery, remove all of the plastic covers, you will see 2 pipes, the top pipe has a small whole in it, you need to loosen clip on it, you can then pull the pipe back of the alloy tube, until you can see the whole is past the end of the pipe, but no need to take the pipe off the alloy tube completely, just far enough to expose the whole.

you dont have to bleed the water it automatically takes out the air when it runs and the thermostat valve opens check the level again after a run of 5 miles or when the temp is in the middle

remember not to check when the engine is hot

If your coolant level dropped you have a leak in the system. Just adding coolant will not solve the problem, as it will continue to overheat. You should have a pressure test done to determine where the leak is. To bleed the system you have to slide back the hose going onto the heater core. At the back of the engine you will see two hoses going thru the fire wall. The hose on the left has a hole in it. Loosen the clamp ,slide the hose back . Add coolant to the system until it flows freely from the hole.Push hose back onto pipe ,tighten the clamp. Start the engine and turn on heater controls to high and run engine until normal operating temp is reached. Stop engine and check coolant level in the expansion tank and add if necessary.

Which bleed screw???????????????

bleeder screw on metal water pipe above inlet manifold. loosen bleeder screw, fill coolant at coolant resivoir untill all air pushed out bleeder.

sounds like your brakes need bleeding and the abs sensor adjusting

You didn't say what year the car is or what other diagnostics you've done lately...My guess is the radiator core is plugged...If you want to tackle it yourself, buy a Chiltons repair manual at AutoZone or NAPA stores ($25). I suspect you'll have to order the manual.
Good Luck

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!

You will need to bleed all four corners, starting at the right rear, then left rear, then right front, then left front. Your bleed procedure always goes from the wheel farthest from the master cylinder, to the closest. By bleeding only the rear brakes, you've gotten air out back there, but not necessarily any air that might have moved farther forward. Bleed your rears again, and then move forward to bleed the fronts, and see if that helps.