Cooling system hi,i change coolent on audi a6 95 and bleed som air out and fan start working but next day i check level and tank was empty and there is no leeks so next day i did same thing and now when engine is runing everything is good but when i start driving the car coolent and steem start coming out tank cap even if cap is tide up,maybe i didnt bleeded properly?can enyone tell me proper way of bleeding air out? thanks

If you have emptied the cooling system and refilled it, you need to bleed air out of the system using the correct procedure for your engine.
If you did not bleed air out after refilling, you will have air trapped in the cooling system and it will not function properly. You will most likely get an overheating condition.

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.

I suspect there was an air pocket in the cooling system, sounds like the garage didn't bleed the system completely, just keep an eye on the coolant level, if it remains constant I would suggest your problem has been resolved. But don't forget, only remove coolant cap when engine is cold. Regards Mike

Set the cabin heater control to hot setting. If fitted with climate control, then put the fan on it's lowest setting.
Remove the radiator cap and massage the radiator hoses by squeezing them with your hand (assuming they are cold/warm only)
Locate any bleed screws on any hoses, including the hoses which supply the cabin heater matrix. Slacken these bleed screws if available. Also check the thermostat housing for any metal bleed screw and slacken that too.
Run the vehicle, and keep a check on the radiator fluid level. Top up if necessary. As soon as coolant begins to leak from any bleed screws, shut them off. Run the vehicle up to temperature, until the radiator fan kicks in. Keep an eye on the temperature gauge and shut the vehicle off if the temperature climbs too high at any point.
Once the radiator fan kicks in, then close the radiator cap.


Run the vehicle for ten to twenty minutes once up to temperature.


Turn the vehicle off and allow to cool.


Check the radiator level and top off if required.


Check the expansion tank level and top up to mark.


Done!


After a day or so running, check the radiator level and expansion tank level again. During the first few days of running, pay particular attention to the engine temperature and coolant level.


In some cases the new addition to antifreeze can reduce the water's coefficient of friction/surface tension enough that small leaks can appear in the system. So after running for a few hours, check the entire system for leaks, and perform a pressure test if possible.


Antifreeze to water should usually be mixed at a ratio of 1 to 1 or 50/50


Good luck!

There is still air in your cooling system and it is either in the heater core or blocking it. Turn the heater on max. heat and the fan on high and start the car and re-bleed the air from the system. It may take a while but you will get hot air from the heater and by then the air should be out of the system. Hope this helps.

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

u will have to re bleed the cooling system this can be done in a number of ways
1 if your coolent hoses have bleed valves open theese 1 at a time and run car until stream of coolent/water is constant no gaps then close valve continue prosses until finnished start at radiator end working towards bulkhead
2 remove water expansion cap and run car with heaters on until fan cuts in wait for car to cool replace cap

never use stop leak in a cooling system now you have to have it flushed which was probably the problem to begin with

You have to bleed the coolant system.There are some bleeder screws,with hex heads on them.Hold the bottom nut and gently loosen the top until water and air flow,with the system not running.When the air is not present,tighten back down gently.If the air won`t bleed out,then fill the coolant reservoir over the full mark about 3/4 way full.Make sure radiator is full,and start engine with ac off.Let it run befor it bubbles or gets too hot,turn engine off,and let it set for about 35 to 45 minutes.Check coolant reservoir to see if the coolant level has dropped.It should have dropped,if so repeat until the reservoir stops loosing fluid.The fans should come on,and go off by them selves.When this happens,then the cooling system is perfect.This I hope helps,please let me know the [email protected]

I have a 1985 Jetta diesel. What I did since the car has no way of bleeding the air out of the system via bleeder screw I parked the car on a slight incline leaving the tank for the fluid at a higher level. I ran the car until the thermostat opened (The thermostat is on the bottom of my engine) I kept topping off the antifreeze. I also kept a jug of anti freeze and water in my car for the next few day. Whenever I got done driving the car and the car cooled off I would check it to see if I needed to top it off. I finally got the air out of it. You could call the vw dealer to see if there is a bleeder on the engine, if so open the bleeder and fill until antifreeze/water comes out, then close the bleeder and top it off to the full level. Just to be safe check the level after you drive the car. Air can still get trapped.