Question about 1999 Audi A4

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How do you bleed the coolant on an Audi A4. 1999 model

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  • char9596 Sep 06, 2009

    my son has replaced seals on my audi and is replacing the coolant. i will show him your reply

  • char9596 Sep 07, 2009

    hey toolbox you should not be giving advise to anyone. there is a process in which you need follow to bleed a cooling system,on further inspection i found the audi a4 v6 has a bleeder nipple at the front of the valley in witch i cracked and guess what?- air came out, funny that, i think maybe you should stick to what you know, nothing about motor vehicles!!!!! I've been a motor mechanic for 10 years and there are many vehicles which have bleeder nipples.

  • char9596 Sep 07, 2009

    hey toolbox you should not be giving advise to anyone. there is a process in which you need follow to bleed a cooling system,on further inspection i found the audi a4 v6 has a bleeder nipple at the front of the valley in witch i cracked and guess what?- air came out, funny that, i think maybe you should stick to what you know, nothing about motor vehicles!!!!! I've been a motor mechanic for 10 years and there are many vehicles which have bleeder nipples.

  • char9596 Sep 07, 2009

    hey toolbox you should not be giving advise to anyone. there is a process in which you need follow to bleed a cooling system,on further inspection i found the audi a4 v6 has a bleeder nipple at the front of the valley in witch i cracked and guess what?- air came out, funny that, i think maybe you should stick to what you know, nothing about motor vehicles!!!!! I've been a motor mechanic for 10 years and there are many vehicles which have bleeder nipples.

  • melee5 May 11, 2010

    I don't understand why you would want to bleed the coolant. This not like applying leeches for better health. Usually the radiator cap automatically bleeds off any air in the coolant system by sending it to the bottom of the radiator reservoir where only liquid gets to return to the radiator when it cools down. Thus when you thermally cycle the engine and radiator, it purges itself of all air. This can take a week or so if you've been into the engine, there is no shortcut to get back to just liquid in there. Why do you think you need to help the process?

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SOURCE: can't bleed coolant system on Audi A3!

In my experience with Audis, after any job requiring changing/draining the coolant the car ideally needs to be driven. With the coolant topped up to max drive the car, keep the revs up and shake the car with steering and over bumps where possible. Whatever you do make sure you take at least 2 litres of water/coolant with you, as as soon as the air lock goes, the level drops a lot and quickly. Also keep an eye on the temp gauge and avoid letting it go much over 90 degrees (over 90 on the gauge usually means its well into the hundreds) When you get consistant hot air through the heater, at idle, the level should of settled. If this doesnt work you may have thermostat issues or a blockage. Good luck, let me know how you get on.

Posted on Mar 26, 2009

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Ok, now what are the leading causes of an overheating audi 80? this ones just hada new radiator installed and has been overheating eversince, im assuming an air lock?? do they have a coolant bleeding...


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1 Answer

My engine ran low on water and subsequently overheated, since re-filling the water, it now continues to overheat. in a best case senario, i'm hoping it's an air block, can you tell me where the bleed...


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.

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Looking for procedure to properly bleed an audi A4 1.8T quattro cooling system as no sign of a proper bleed point on any of the heater/cooling hoses/pipework, car overheated today & blew out some...


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.
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3 Answers

Can't bleed coolant system on Audi A3!


In my experience with Audis, after any job requiring changing/draining the coolant the car ideally needs to be driven. With the coolant topped up to max drive the car, keep the revs up and shake the car with steering and over bumps where possible. Whatever you do make sure you take at least 2 litres of water/coolant with you, as as soon as the air lock goes, the level drops a lot and quickly. Also keep an eye on the temp gauge and avoid letting it go much over 90 degrees (over 90 on the gauge usually means its well into the hundreds) When you get consistant hot air through the heater, at idle, the level should of settled. If this doesnt work you may have thermostat issues or a blockage. Good luck, let me know how you get on.

Mar 25, 2009 | 2005 Audi A3

1 Answer

Coolant system


leave cap off for a couple of mins and start car and the air lock will come out of the motor make sure that you dont take cap off when hot

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