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Right dont think their is a bleed out on this motor ,fill it up run engine till warm then allow to coool and check the level again,should be ok unless you have another problem that you havent stated previously like why did you change the antifreeze in the first place ,stop reading all these s t u p i d books by little more than technical writers who think they know it all and know sweet FFFFFFF all .You only change antifreeze if a leak or a component change .Yes i know what they say but beleave me you will change a hose or water pump before the antifreeze needs changing.Leave well alone while a motor runs just do a regular oil change every 5000 miles witha oil filter every third oil change ,inspect everything but leave it alone and stop reading these sunday drivers type book .
Have you tried to bleed the brakes,it sounds like you have air in the system. I would try bleeding the brakes first ,start with the wheel farthest from the master cyl. The right rear,left rear,right front left front. If that does'nt help check the master cyl and brake booster.
Most common coolant leak is from the thermostat housing seal. Replace seal or housing and bleed properly. Loosen plastic bleed screw on pipe above fan belt. Fill coolant via pressure cap ( right had side of engine....not expansion bottle) tighten once coolant free of air is seen. Run engine, loosen other plastic bleed screw on heater hose ( towards bulkhead ) and retighten once coolant runs free of air. Top up via cap again, run engine at 2500 rpm for 3 minutes with heater on ...should be very warm now. Once cool, check level and top up as required.
What engine? For the 3.5l, jack up the right front. Remove the bleed screw that is in the upper right of the radiator. Fill the coolant recovery tank until the coolant flows out of the bleed screw. Put a paper towel or rag between the outlet on the side of the bleed screw and the headlight. Screw the bleed screw until it barely closes. Run the engine and open the bleed screw until coolant streams out of the outlet. Close and let engine warm till thermostat opens. Carefully crack open bleed screw very slightly and let air out - careful, this is killer hot steam and water. Check coolant level. Unjack car and recheck coolant level after 4 or 5 thermal cycles (cold start, warm til thermostat opens, cool down).
turn off radio so you wont lose code.disconnect negative battery cable.remove drive belt.get a drain pan to catch coolant.place it under the radiator.then open the radiator drain on the lower right side of radiator.then remove coolant pressure cap and open thermostat bleed valve.BESURE TO PUT COOLANT SOME WHERE SAFE .BECAUSE KIDS AND PETS WILL DRANK IT.know you going to have to move the timing belt.besure to get your engine on TDC AT NUMBER 1 FIRING POSITION.REMOVE THE WATER PUMP BOLTS.AND PUMP.THROW AWAY THE O-RING SEAL.CLEAN GASKET SURFACE DO NOT SCRATCH.INSTALL NEW O-RING DIP IT IN COOLANT.DONT GET DIRT OR GREASE ON IT OR IT WILL LEAK.THEN YOU PUT .PUMP AND O-RING TO THE ENGINE BLOCK.INSTALL THE MOUNTING BOLTS.TORQUE TO 105 INCH POUNDS.THEN YOUR TURN PUMP WITH HANDS MAKE ITS NOT TO TIGHT AND CLEAR. INSTALL THE TIMING BELT LOOK AT TIMING MARKS.GET A HAYNES MANUAL YOU NEED PICTURES TO SEE THE TIMING MARKS.BECAUSE IF TIMING OFF.YOUR ENGINE IS DAMAGED.WHEN YOU GET TIMING RIGHT THEN YOU CLOSE RADIATOR DRAIN.THEN YOU OPEN THERMOSTAT BLEED VALVE.GET A 1/4 INCH CLEAR HOSE ABOUT 48 INCHES LONG.YOU PUT ONE END ON BLEED VALVE AND THE OTHER END IN A EMPTY CONTAINER.TO KEEP COOLANT OFF THE DRIVE BELTS.NOW YOU START FILLING WITH COOLANT BY POUR IT IN THE COOLANT PRESSURE BOTTLE UNTIL A STEADY STREAM OF COOLANT RUN OUT THE THERMOSTAT BLEED VALVE THROUGH THE CLEAR HOSE.GENTLY SQUEEZE TOP RADIATOR HOSE UNTIL AIR OUT OF THE SYSTEM.CLOSE BLEED VALVE REMOVE CLEAR HOSE.FINISH ADDING COOLANT TO COOLANT PRESSURE BOTTLE UNTIL YOU GET TO THE RIGHT LEVEL.PLACE CAP BACK ON COOLANT BOTTLE.RECONNECT NEGATIVE BATTERY.START ENGINE.LET IDLE CHECK FOR LEAKS. IF OVERHEATS YOU STILL HAVE AIR IN SYSTEM.LET IT SET A WHILE ADD MORE COOLANT IF NEEDED DONT DRIVE UNTIL IT STOP OVERHEATING.IF OVERHEAT WHILE IDLING WAIT AWHILE CHECK COOLANT LEVEL.DONT OPEN TOO SOON YOU WILL GET SCALDED.KEEP DOING THIS WHEN IT STOP OVER HEATING AIR IS OUT AND YOU CAN DRIVE IT.
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.