Replace cap, run car again until it reaches operating temp. Turn the car off and refill the radiator to the The radiator cap off until the thermostat opens, the upper hose will be With a cold engine, open the radiator cap andĪdd 50/50 mix, fill the resevoir to the low mark. Refilling the system and getting the air out,the leak may only occur ![]() Pressure occurs when the glycol is operating temperature. Your thermostat may open slower, resulting in a pressure build up at the The rear ports are cast into the lower intake manifoldĪnd are dead ends, air can get trapped in that area. The rear lower intake bolts and the front ports are directly in front of Then you'll have some real data to help a mechanic diagnose if there is indeed a leak.Always find the source first, The rear water ports are directly behind When it does, record the mileage, date, and amount of coolant added in ounces. Do not refill the system until the low coolant light comes on. Get the coolant level correct and record the mileage and date, then every week, open the reservoir when the engine is cold and check the level. True "expansion tanks" are not pressurized and are used in systems where the pressure relief valve is on the radiator built into the radiator cap and overfilling the system just bleeds the coolant into the un-pressurized expansion tank. no side tanks), so most of the coolant resides in the engine block, hoses, and coolant reservoir. There is very little coolant reservoir space built into the radiator (i.e. The reservoir is pressurized and holds coolant for the system. For some reason BMW calls the coolant reservoir an "expansion tank", but it is not on the E9X. With the E90 system, you really can't tell the level of overfill since the measuring stick maxes out with very little increase of added coolant. ![]() So over filling the cooling system can show a false consumption level as the system tries to equalize it runs somewhere around 16 PSI, the cap will bleed off the excess coolant as that is the reason it has a pressure relief valve built into it. Over filling the cooling system adds stress to it because the pressure inside the cooling system increases as the volume of the liquid expands when it gets hot and has less space to expand in. You said you filled it to just above max level. ![]() If the oil were to be contaminated it will show a milky-white gelled substance under the oil fill cap. A properly executed pressure test would show those gaskets leaking. If it is leaking into the oil, it's only two places it can do that: at the cylinderhead gasket, and/or the OFHG. They didn't replace the thermostat when they did the pump I wish I had remembered to ask them to.īut again weird thing is not seeing the leak anywhere unless it's leaking into the oil somewhere if there is a gasket failure which then I'm really screwed The question is if it gets close to empty low, there must def be a leak - period.īmw replaced the water pump about 3 years ago at 20k miles. I fill it just above the max level - I haven't checked in a few weeks now and no light yet, but I'm sure it's getting low. Relax, what your car is doing is most like normal coolant loss. ![]() IMO BMWs owners, for some reason, are way to OCD - the internet just makes it worse. If the system has a small leak, you'd smell coolant, and a small leak always turns into a big leak in short order. If you are that concerned, then get a new cap and keep an eye on it. They probably didn't check the pressure valve in the cap. Hell, your lucky they were honest and didn't BS you into replacing something in the cooling system (like a cylinder head gasket or OFHG). There is no dealership in the world that would find a leaking cooling system and NOT recommend you fix it. If the dealer pressure tested the cooling system and it didn't leak, then it's not leaking. The reservoir cap can weaken over time and let coolant as vapor press escape. Cars use coolant over time, especially as they age the reservoir cap is a pressure valve, so when the coolant gets hot, it vaporizes and the vapor escapes. If it was just slightly less, then it's just a fluid temperature thing. How low was it? How warm was the coolant each time. I think bmw dealer just did a pressure test Guess I should explain maybe take the bottom cover off take for drove then throw on lift to see if anything I'm not sure if I should bother taking back to dealer or use a Indy shop in my area that works on bmw Porsche etc that's pretty reputable. I give up fellas- checked after tipping off a few weeks ago, level is below the high level mark- I use light to check for wet areas on the bottom pan and dry as a bone.
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