Question about 1990 Audi V8 Quattro

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My audi v8 quattro 1990 will not hold it's antifreeze.. looks like it got really hot where center hose burned a small hole... it was patched but i have not put new antifreeze in it yet..any suggestions to what the problem is.. if i did not put in manufacturers suggested antifreeze could there be a problem.. i filled it up like 7 months ago and it worked fine.. now all of a sudden it will not hold and it is leaking again. antifreeze tank is completely depleted again. help me please

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Well one you cant "patch" a radiator hose, especially one under high pressure with quite a few bends on the V8 Q's. (I assume you are referring to the upper hose). First replace the hose, which will be more expensive than a Granada's :). Then I, Not saying you should do this, but again I would experiment with water instead of expensive antifreeze, at least checking for leaks. You probably don't want to bring it to 100% operating temp however as water has a lower boiling point than antifreeze. Ok let me just ******* and move on.
YOU fill with at least 50% antifreeze when car is cold (more if the outside ambient temperature says you should). Start your Audi with the fresh fluid. Let her run for a while why you watch the temp. gauge on the left. Should stay right below 100 (center marker), possibly a tad over. Do not let it overheat. (this is assuming your gauge is working, and your temp sending units (3) and auxiliary fan are functioning. Look for leaks. Step behind the car and get your nose close to the exhaust. Does it smell like sweet antifreeze? Do you see white smoke? If neither head gasket is probably good although leak could be finding another outlet. Usually not with the v8Q's. Is your thermostat opening? Check and see if you have heat? if no heat then your coolant isn't circulating properly = bad thermostat, filthy radiator and coolant system needs major flushing or possibly worse your heater core is gone, which would indicate constant fogging on the inside of windshield noticeable when the defrost is put on and smell of antifreeze in the cabin. This would also explain a not so obvious loss of antifreeze. If indeed your heater core...sorry ...not fun on this car. Not fun at all. Good luck.

Posted on Oct 10, 2009


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