![]() ![]() Current mileage on car is 138,000 but the engine it'self has only 90,000 (thats another story) we've just been living with this "Check Coolant level" warning ever since, I'm just getting tired of it. probably within a week of the radiator failure that happened 6 months ago. The check coolant level light comes on every start up and shutdown, even though the fluid level is above the kalt line- even lapping at the radiator cap.Ĭhanged the termostat right after the radiator. Since the check coolant light comes on every time we start the car, whether it has been sitting over night with temps in the 30's or at the grocery store with the car at operating temps. The fix was to replace the radiator, but I overheated the car enroute to the house cause I couldn't get enough water into the system. This I know cause I was able to reconnect the hose to the fitting that had only about 1/4 inch left connected to the radiator. Nope it wasn't the hose clamp but the plastic nipple that the upper radiator hose connects to. All the coolant leaked out due to this break. When I got to the car there was no coolant anywhere to be seen as the radiator broke about 3 hours beforehand. I'll answer your questions as you laid them out. You have a bad waterpump or thermostate that could cause the hose to blow. Your resevoir aka radiator cap is not holding any pressure, thus causing your coolent to boil and this might cause your hoses to blow.ģ. I think you have a bad seal on the coolent sensor (which will cause coolent to leak out and also display the dreaded "Check Coolent")Ģ. Here's my basic solution, that could or could not be the right cure for your issueġ. The reasons, I ask those questions because I want to make sure your problem is only a leaking coolent hoses. Third, Did you have your mechanic pressure test the radiator cap and the entire coolent systems?įourth, when the last time you changed your Thermostate and Water Pump? Also, what's your current mileage? Second, Are you sure it was that hose clamp came loose, thus causing you to loose coolent? ![]() If no, then again, how much would you say leak out? Total hardness, max.: 3.6 mmol Ca 2+/ltr.First, How much coolent did you see on the ground? Was the A/C on? If yes, then its from your condenser and is normal. Total hardness, max.: 20° dH (German hardness grade) or in new measuring unit: Minimum requirements concerning water quality: In many of our countries the tap water is sufficient see this from BMW (So long as it is mixed with the right antifreeze): It isn't a given that distilled water must be used. If the engine does consume coolant due to a leaking head gasket, the sealed system will be further pressurised by the combustion gases and could cause failure elsewhere in the coolant system where coolant will escape. I have a 530d that hasn't consumed a drop over the 7 years of ownership. ![]() Unless there is a leak, or the engine is consuming coolant via the head gasket or other failed water-cooled component connected to the engine intake/exhaust systems, the level should not drop. If yours is losing coolant, get it checked out by someone with the right tools to diagnose either a pressure drop (all coolant removed method) or for the presence of combustion gases in the coolant (with the engine running). These are sealed, pressurised systems that should remain that way (there is a pressure relief valve in the expansion tank cap). (Unless your car has had its coolant replaced with non-BMW specific coolant over time- use the appropriate one for the situation)Ĭoolant systems should not lose coolant as a general rule of thumb. BMW's is longlife so rather than save a few dollars, buy the right stuff from BMW. (Coolant has antifreeze and anti corrosive properties that Water alone does not provide)ĭon't mix coolants. If you must top up have a quantity of ready mixed 50:50 of the appropriate coolant with water handy. My twopence worth on cooling systems and coolant (A number of these points have been made before in this thread): ![]()
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