Hi all, I have a problem that my mechanic hasn't been able to figure out. I'm not particularly savvy about cars, so any help is much appreciated!
<br/> I have a 1998 A4 Audi Quattro 2.8. In the last 2-3 months, the day after I drive more than hour or two, I find that my low coolant light comes on and my reservoir is empty. I have noticed that after some of these drives, I'll see steam coming up from under my hood. Opening the hood, I'll find that coolant is coming out of the bottom of my reservoir through what I think is an overflow valve.
<br/> The strange thing is that my mechanic has flushed the coolant system, pressurized it, and says that there is no leak that they can find. Certainly no leak that could result in a loss of all the coolant so quickly. They also say that the water pump looks fine. My engine isn't overheating, at least according to the gauge.
<br/> However, the problem is really disconcerting since I'm filling up on coolant every few days.
<br/> Any suggestions on what might be going on?