How to bleed the air out of Cooling System?
10-03-2005, 03:27 AM
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How to bleed the air out of Cooling System?
I seem to be having some cooling system issues with my 2000 2.8L A6. Some air seemed to have entered into my cooling system when one of the plastic connector right before the coolant expansion tank busted a few days ago. I have replaced the plastic piece and refilled the expansion tank with the missing coolant and tought that was it. Now, when my car runs, but mostly when the engine gets shut off, the coolant starts to break out through the cap of the expansion tank. The flow seems to be very quick and a lot of the coolant gets spilled every time. This does not happen as much when you drive, but onmy and possibly mostly when i shut off the engine and the coolant starts to circulate through the engine for a few minutes before it completly stops. What is the bast way to bleed the air out of the system? If anyone has step by step or pictures on how this can be accomplished, i would greatly appriciate it!!
10-03-2005, 07:00 AM
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Re: If it's coming out THROUGH the cap, it's likely overpressurizing/overheating.
The temperature is always the same, sometimes when the car is idle and not moving, it just very slightly moves to the right, just at the edge of the middle gauge. It could be over pressurizing, but i doubt it would be overheating, the oil temperature is always at the same level. Hoping that this could be very simple thing to fix.
10-03-2005, 07:23 AM
#4
Threre are 2 bleed points on the hard lines, one under the tank, one near the power steering pump..
there is a third, you have to actually loosen and slide one of the heater hoses (it's the one with teh tiny hole in it) off of the barb slightly, to expose that hole..
10-04-2005, 07:22 AM
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Air is out of the system, but no difference
I have found the bleading point and all the air has been purged out of the cooling system but am still getting the high pressure and coolant blow out at the reservoir cap. My next move will be to remove the thermostat, because i live in florida and it doesnt get the exteemly cold here, and run the engine without it. I think that the thermostat is not opening all the way or at all and is causing this pressure build up and blowout. Will attempt the work this weekend, hope this would make a difference.
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