Question about 2002 Audi A6

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Coolant system THINK I MIGHT HAVE AN AIRLOCK IN THE COOLANT SYSTEM, HOW DO I BLEED IT?

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  • Anonymous Mar 02, 2009

    heater throws out cold air, car overheats. I replaced the thermostadt and still having the same problem

  • KASS101 Apr 27, 2009

    I HAVE A 96 AUDI A6 ITS OVER HEATING I JUST PUT IN A NEW THERMOSTAT STILL THE SAME.THE LIGHT KEEPS SHOWING LOW ON ANTIFREEZE..I OPEN THE TANK AND START THE CAR TO RELEASE THE AIR AND STILL THE SAME WHAT DOES THAT MEAN????

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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

Posted on Nov 06, 2008

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E150 van overheats


You have to bleed the system. Not very likely an air lock, since air will come out of the fill bottle sooner or later. You can try removing the rad cap (when its cold) start it up. put heater on high, let it run and check for good coolant flow in the rad. Any trapped air will also come out.

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How to bleed off any airlock


Check for bleed valves in the system. Open the bleeders while filling through the radiator until bleaeders drip and close them. If there`s no bleeders open radiator cap, start the engine annd run it for a minute. After that, top up with coolant and repat if necesary. Close the cap.

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1992 325i has airlock. How do I use the bleed screw to get the air out?


Just open it up with the engine running. Then watch until coolant starts to come out and then top off the system after it cools down, make sure the coolant bottle is full on shut down..

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Open Air Bleed on Heater Hose,then Heater Air Bleed below master cylinder

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Car overheated, had hole in one of the hoses. I repaired hose, replaced antifreeze and now I have no heat and Power steering is hard to turn wheels.


I don't think these two problems are related.
check the coolant level when it cold
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1 Answer

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The generic method of bleeding air from the cooling system is to use a floor jack and raise the front of the car as high as poss, then fill the coolant recovery tank full and run the engine until it just starts to overheat, high end of normal zone on gauge, then shut the engine down and run cold water over the radiator core, this will self bleed the system and the coolant will be pulled from the recovery tank, repeat as necessary, never let the recovery tank run dry or more air will be pulled into the cooling system l , if it still overheats then you need to have the head gaskets checked with a gas analyzer for hydrocarbons present in the radiator or recovery tank

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1 Answer

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Your overheating problems can have several possible causes.
1) Airlock in heating system - solution - bleed air from cooling system.
2) Radiator blocked - solution - drain and flush radiator
3) Failed waterpump - solution - fit new waterpump
4) Engine thermostat stuck in closed position - solution - fit new thermostat
5) Electric cooling fan (if fitted) failing to operate - solution - check fan, fan operating switch, all wiring and connectors
6) Not enough coolant in system - solution - check and top up to required level. Also check all hoses for sign of leakage.
7) Faulty temperature gauge giving incorrect reading.

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1997 Jeep Grand Cherokee Orvis with overheating problem


There may be coolant in the reservior but it doesn't necessarily mean there's any or enough in the main cooling system. If the radiator has a pressure cap, try replacing it with a known good one. Check and replace any coolant hoses that are kinked, or collapsed. There may be an airlock in the system - bleed it in accordance with the manufacturers instructions. Try flushing out the radiator and cooling system and then refill with the appropriate antifreeze / water mix ensuring that no air locks remain.

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