![]() Reconnect all hoses and slowly fill system with G12 or its later versions. After you think you have all debris out blow out system. If lots more sludge comes out, it probably will, connect hose up again and flush out, vary the water pressure a bit but not enough to blow the hose out the radiator hose, drain blow check and repeat again if needed. Turn off tap and drain out all water and blow. Let it flush for a reasonable amount of time until the water looks clear. Get your garden hose - hopefully no hose pipe ban- wrap some plastic around the end to make it a better fit in the radiator hose and turn the tap on. I would also change the thermostat now as it is cheap and you have already emptied the coolant out. I took the small return hose off the top of the expansion tank and connected another piece of clean hose onto the tank and blew until no more came out of the other disconnected hoses. Drain all coolant out of system from lower radiator hose and by removing one of the water pipes from the oil cooler block just below the oil filter and dispose of the used coolant responsibly.Try to get as much out as possible by blowing air into the system. If brown then wrong coolant has been used and you are damaging your engine. Is your coolant a nice pink colour or is it brown. If the coolant has not been changed as per Audi guidelines then there is a good chance there is unwanted residue and contaminates in your cooling system. not on my watch love!!! Let’s prove her wrong and get the lit'mtle tub running sweet again! ? Any help, previous experiences or guidance would be fantastic as I’m all out of ideas and the OH is pressuring to get rid of the car. most recently the alternator clutch pulley that decided to abandon ship mid journey! ! ! The coolant problem is about the only outstanding task to resolve on a pretty substantial to do list. The old girl has had a lot of parts replaced over the last 6 months. I would LOVE to get this resolved without aimlessly replacing parts in the hope of stumbling on the problem. not on my watch love!!! Let’s prove her wrong and get the little tub running sweet again! ? ![]() I poured gasket fix into the system after draining on the advice that it the head or gasket leaking combustion gases into the coolant system but it doesn’t seem to have helped? Also, would I witness bubbling in the expansion bottle with the lid off if that was the case? The car can idle all night on the drive with the cap off and not lose a drop! The coolant is lost a lot quicker when at higher speeds and revs. I replaced the cap originally thinking it was faulty before I witnessed these exit dribble marks. I know it’s coming from these little vents as there is tell tale water mark dribble from this area which then pools around the lip where the 2 halves of the bottle are fused together. ![]() There seems to be no other visible leakages anywhere. ![]() to the point where I’m losing coolant which is spraying out through the little square vents on the side of the bottle. In a nutshell, my coolant system is is really over pressurised. This has been an on going problem that has caused major frustrations in the heat wave we’ve been experiencing. ![]()
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