Sometimes, you’ll find that you do not have coolant leaks at all, but the levels of the said fluid are always low. In some cases, though, the leak isn’t as apparent. When that happens, it might spell disaster for your car as it is crucial in staving off the accumulation of residual heat from the combustion process.Ĭoolant spills are a mess, but losing coolant without without visible leaks is a pain too This of course is especially true with coolant. Sometimes though, these fluids can escape their rightful containers. It needs oil to lubricate the engine’s moving parts, hydraulic fluid to actuate the clutch and brake, among others. You should not have to consistently add coolant.It is a given that cars need several types of fluids in order to operate correctly. Replaced the head gasket and problem was solved. BMW mechanic said the coolant was getting into the engine and the engine was hot enough the evaporate it off. It took another half a big bottle to top it off. In any event, I topped it off with more coolant. It's freezing out, and the engine remained at perfect temps throughout the drive, so I figure there was never real concern. Thanks this is helpful, and I came to a similar conclusion. I'm not promoting to blow off keeping an eye on the coolant, but I'm convinced you will not have any engine damage if it does get low on the trip home. I was very impressed, and believe the technology hasn't gotten worse over time. Idrive started with low coolant, then notified me of inability to continue cooling the engine and the notified me it was shitting the engine down to prevent damage.Ĭar was repaired and engine lasted plenty long after it. Apparently I had also ruptured an auxiliary radiator, and was losing coolant quickly. I had some front and left side damage, put some duct-tape on it and went on. I unwillingly tested this in my 2011 X5 many years ago after hitting a dear in the middle of the night and in the middle of nowhere, stopping wasn't an option. To comfort you, if the coolant is too low and the engine would start getting too hot, the car will let you know, tell you to pull over and shutoff the engine, and if you don't, it'll do the engine shutdown for you and let you roll out to get to the side of the road. But what I said above still applies regarding the engine coolant expansion tank and the charge air coolant expansion tank. The engine bay layout is different and the online pics I could find are not that helpful. blue anti-freeze) in the cooling system to do what the coolant is supposed to do.Įdit: In your sig I see you have the 50i. Incidentally, if all you are doing is topping off your expansion tank with a few cups of water or less, distilled water is fine as there is more than enough coolant (i.e. But check your owner's manual for final verification of which is which. The charge air coolant expansion tank should be the slightly smaller all black tank on the driver side of the engine compartment, right next to the engine. I don't have an X7, but based on pics of the 40i engine bay (with B58 engine), I assume the engine coolant expansion tank is the large white tank with black cap in the front driver side corner of the engine bay. Both systems use the same BMW 50/50 blue coolant mix. There is also another coolant expansion tank that is for the charge air cooling system (the air/water intercooler that cools the compressed air from the turbo before it enters the engine). The engine coolant expansion tank is where I am assuming you topped off your coolant a few weeks ago per your earlier post. Stupid question: what is the expansion tank? Is that the second smaller coolant tank right at the front of the engine bay? Thanks! If your expansion tank is completely dry/empty (or near empty), then you definitely have a leak someplace and you should get it checked out. If your expansion tank still has water in it, you should most likely be fine - just top it up a bit to the low end of the band with distilled water. I just replaced mine on my F80 M3 due to a slow "weep" around the plastic weld that holds the expansion tank together.ģ) Does the low level message go away once the engine is started and/or warms up a bit? some other things to check/look at.ġ) What is the level of your expansion tank now, with the engine cold? Is it completely empty or can you still see water in the expansion tank?Ģ) Do you have any dried coolant residue anywhere around the expansion tank, including at the plastic weld seams? BMW expansion tanks are notorious for failing. With all of the cosmetic coverings in the engine compartment it is difficult to make a "quick" inspection of the engine compartment for obvious leaks. Unfortunately, with items like this it can be difficult to say.
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