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. Animals love its sweet taste, so even a spilling a small amount on your garage floor can end up in the dog's stomach pretty quickly.Unfortunately, with items like this it can be difficult to say. Promptly wipe up any spilled fluid as it is highly toxic. Always wear safety goggles when working on your Cayenne. Removing the coolant reservoir cap on a warm engine could cause the cap to fly off at a high rate of speed and fluid to spray out of the reservoir. These coolants will typically say 50/50 or pre-mixed on the front of the coolant bottle. Some coolants will come premixed-that is, you don't need to add any water. Mix the coolant / antifreeze with distilled water so that you have a combination of 50% coolant and 50% water. ![]() ![]() Be sure to check your owners manual to determine the correct type of fluid to add - for Porsches, it will typically be in a section titled Fluid Capacities in the back of your manual. The video above shows you where the coolant reservoir in your Cayenne is located and how to add coolant / antifreeze. Make sure to check your engine when it is cold for an accurate reading. Engine coolant / antifreeze circulates through your engine to keep it cool in the summer but won't freeze in the winter. Adding engine coolant (also known as antifreeze) to your 2013 Porsche Cayenne is pretty easy.
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