Audi A4 2.5 V6 TDI - Creamy grey coolant in expansion tank
I've found the expansion tank full of a creamy grey liquid. The level was normal, but the coolant warning sign had come up on the central instrument cluster display. This comes up for either coolant high temp or low level. I drained off some of the grey liquid and put water in. The warning sign has gone away. Is this an oil cooler leak, or head gasket ? No steam coming out of exhaust and now low coolant level. Cheers, Kevin
I have 2004 a6 v6 tdi and suddenly recentley noticed the water had gone down in the rad top up bottle,the oil is as normal and i can't find any leaks, no water on drive there is no oil in header tank,car done 90k with fullaudi sh
Sounds like blown head gasket (or worse) still to me.
Remove oil filler cap and look for grey oil.
Never use water these days but special coolant. Water makes vapour spots and cause block cracks, worse then blown gaskets!!!
vapour does not cool very well.
Look like you have cracks already.
Take a compression test if possible. But might not show op at that temperature.
The gauge indication troubles me.
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Head gasket?, sounds like it is creating steam by burning coolant, check your oil filler cap, is it full of creamy gunge? check the coolant expansion tank is it smelling of fuel and murky with traces of oil?, is the car running temperature hotter than usual?, if the answer is yes to any of these the gasket is on its way out.
Check the engine oil. If it's creamy-coloured, you probably have a blown head gasket or cracked head. Also, you may see bubbles in the coolant expansion tank as you crank the engine. The white smoke is most likely steam from the coolant which is escaping into the combustion chambers.
I WOULD CHECK BOTH RADIATOR HOSES TO MAKE SURE THEY ARE HOT. THERMOSTAT COULD BE STICKING SLIGHTLY CLOSED.CHECK COOLANT LEVEL MAKE SURE COOLANT NOT LOW.IF COOLING NOT BOILING OUT OF THE EXPANSION TANK. I WOULD HAVE CAR HOOKED UP TO A DIAGNOTIC SCANNER AND CHECK COOLANT TEMPERATURE SEE IF TEMP. OVER 230 DEGREES IF SO RADIATOR COOLING FANS NOT WORKING.COOLANT THERMO SWITCH BAD BOTH FANS SHOULD BE RUNNING AT LOW SPEED.IF ALL LOOKS GOOD YOU COULD HAVE FAULTY LOW COOLANT SENSOR IN EXPANSION TANK.MAKE SURE COOLANT IS IN THE EXPANSION TANK BECAUSE COOLANT LEVEL COULD BE LOW.ADD COOLANT IN THE EXPANSION TANK UNTIL YOU AT MAX LEVEL LINE ON THE EXPANSION TANK.DONT OVER FILL THE EXPANSION KEEP ADDING COOLANT UNTIL COOLANT LEVEL STAYS AT THE MAX LEVEL LINE ON THE EXPANSION TANK.
Transmission fluid goes through the radiator to cool. The line could be leaking into the radiator as it goes through. Usually at the near the bottom is where the line goes in and comes out the other side.
sound like you have faulty low coolant level sensor in the coolant expansion tank.make sure coolant expansion tank has coolant should be on full hot mark when engine hot been driven.cold engine coolant level in expansion tank should be on full cold mark.
Those expansion bottles are not meant to be topped off. When the engine gets hot it's going to push coolant out of the bottle then when it cools down its going to look like your losing coolant. What's the psi rating on your radiator cap? Make sure it's the appropriate psi rating for your system. Less psi allows the coolant to escape prematurely. Try replacing the cap. The cap may be old and the coolant is getting by because the spring on the cap is bad. If your worried about the head gasket, have a repair shop test the coolant for engine gases....just to make sure it's not the gasket again. Because if they didn't resurface the head when replacing the gasket it may very well be a blown gasket again.
theres no water, theres no coolant, no cracked block, theres no problem, it is normal for an rx8 (for that matter a rotary engine) to have some white foam on the dipstick. all it is is oil being thrown about by the rotors all over the chambers and foaming up, there is nothing to worry about, its just oil. it is more noticeable in 04-05 models and if you so desire you can go to a mazda dealership and the will install baffles into your oil pan or a new one that is updated to help prevent this because they redesigned it after 05.
hate to be the bearer of bad news, but i think your head gasket has failed causing the oil & water to mix in the engine. usually, the water enters the oil causing the milky cream liquid (check the under side of the oil fill cap for this same creamy liquid) and you wind up adding coolant since it gets low.
if the coolant is not getting low, then it may not be anything to worry about. in the colder months, BMWs have been known to display this creamy liquid on the oil cap. it disappears when the weather gets warmer. BMW has a service bulletin on this.
have a compression check done on it to see if this is truely the case. i hope i am wrong. and 1 pint every 2-4 thousand miles is not too bad.