![]() ![]() Genuine BMW coolant Fill the empty bottle with 2 quarts of straight coolant, noting the indicator on the coolant bottle. To do this, pour 2 quarts of straight coolant into your empty 1 gallon bottle. Make a 50/50 mix of distilled water and coolant. THE BLEEDING IS DONE WITH THE ENGINE OFF. Large bucket or drain pan to collect coolant (cat litter buckets are good for this). ![]() Distilled water (And an empty distilled water bottle for mixing the coolant).BMW Approved coolant (Genuine BMW coolant, Zerex G48, Pentofrost NF, etc.).These minerals tend to bind with the metal surfaces, inhibiting heat exchange and–in the case of a high mileage engine that’s been run with high mineral content water for most of its life–could actually clog a passage. If you put tap water in your engine, you add minerals into the system. It’s used because it has no mineral content. This process is so expensive that many just opt for a used engine.ĭistilled water. When these all-aluminum engines overheat, they tend to warp, necessitating replacement of the head gasket and machining of the head. An air pocket will, sometimes, stop the coolant from flowing through the engine, thus overheating it. It’s even more important right after you’ve attempted to bleed the system, when there’s a real possibility of error that might’ve introduced an air pocket into the system. This is a basic bit of advice for you to remember all the time. If, at any point in time, the coolant gauge needle goes past the middle, SHUT THE ENGINE OFF IMMEDIATELY. Electric water pump cars, apparently, require a different procedure. This procedure only applies to older BMW models with mechanical water pumps. Because these generally come in gallon bottles, you will need to buy two gallons of each. If you’re doing this on an E46–the BMW pictured here–and filling from empty, you will need just over a gallon of coolant and a gallon of distilled water. The parts quantities are up to you to figure out for your specific application. I hope I haven’t failed in making it as simple as possible. When you add new coolant, you have to bleed the system at the same time. If you’ve done cooling system work on your BMW, you will have to add new coolant. It’s the unreliable nature of the BMW cooling system that forced me to become so well acquainted with the bleed procedure. This isn’t to say, of course, that BMW cooling systems tend to be good, overall, with regard to durability and reliability. Even though this is a rather ingenious design, it seems that many people have trouble understanding it. Most BMW models have a bleed screw somewhere on the uppermost part of the cooling system. (Updated December 2019) - Follow me on Instagram: /gumptiontrap/įor all the problems with the cooling systems on various BMW models, they actually have a rather simple and elegant solution to the common air-in-your-cooling-system issue. ![]()
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