Low coolant

BMW 328xi 2007 coupe. I turned it on today in the morning and the low coolant light turned on, then the car shut off, I tried turnIng it on again and it started shaking and cranking but it wouldn't turn on. What can be the issue?

My car has 105800 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi There,
If you are referring to the check engine light that looks like a half full engine, this is related to the low coolant indicator as you have indicated. The reason the engine shut off may be that the car has gone into "limp mode" which is a safety feature the computer will trigger when it detects things like low coolant, low oil pressure or various other serious engine component problems. I would suggest checking your coolant levels to be sure it is properly topped off. If this does not solve your problem, I would recommend scheduling an appointment with one of our expert technicians to have them come to your location to take a look at your vehicle.

How to Identify and Fix Common car Problems ?

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Reasons Why Your Coolant Might Be Low

leak in radiator. leak in radiator hoses. leak in water pump. damaged or broken radiator seal.

Coolant helps pull heat away from the engine. So, without enough coolant, the engine could overheat or seize up. Continued use of an overheated engine could lead to permanent damage, such as pistons welding to the cylinders.
How do you know if your car needs coolants? If the coolant is low but above the minimum mark, then you are still fine to run the car for a few days, but if the coolant is below the minimum mark, please do not even try to drive your car like that so you don`t knock your engine. You need to top up the coolant.
Faulty Sensor

Most vehicles have a sensor that floats in the coolant tank and when the coolant level gets too low, then the sensor is triggered. If your coolant light is on, but the coolant is not low in the reservoir and it appears there are no leaks, then your vehicle may have a coolant sensor malfunction.

Providing that the engine is running well, with no leakages or damage, you can expect a coolant loss of 0.25% every four to six months. This means a loss of two to three ounces a year is completely normal.
Technically speaking yes you can use plain water in your cooling system but it isn`t recommended as a long term solution and certainly not in extreme weather conditions.
How often should you change coolant in a BMW? Typically, you should have your BMW coolant flush completed every 30,000 miles or every two years.
If your car has a low coolant you can drive for some time. It really relies on the level of coolant. If it is low but it is above the minimum, you can drive your car for a few days. But if it is below the minimum, please do not even try to run your engine.
While you can drive the car for a short time using water in place of the coolant, it won`t effectively protect your engine. This means its essential to get the problem that caused a low coolant level fixed as soon as possible, and the radiator filled with a 50/50 ratio of coolant to water.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

No coolant in the reservoir. Seen low coolant message. I added 2 quarts of 50/50 coolant. Still getting the message. How much coolant doe it need?
ANSWER : Hi there. For the coolant light to go out, you would need to have the coolant between the low line and the full line for the light to go out. If the coolant is low and keeps on being low, then look for any signs of coolant leaks. You may have to use a coolant pressure tester to pressurize the reservoir to allow the leak to be found.

If you need further assistance with the coolant being low and the warning light being on, then seek out a professional, such as one from Your Mechanic, to help you.

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Over heating coolant not siphoning back into coolant over flow tank
ANSWER : Hey there:

It’s common for many mechanics to make the mistake of mis-diagnosing the cause of an overheating situation; especially when they assume it’s a thermostat issue. The problem could be caused by a blockage in the coolant tubes running from the radiator to the overflow tank and back to the radiator. However, it also may be due to air trapped in the coolant lines. I think a good idea would be to contact a different ASE certified mechanic, such as one from YourMechanic, and have them complete a coolant flush, which should remove any blockages in the coolant tubes and may solve your problem.

Read Full Q/A … : Low coolant

I have a 2001 buick century it heater wasn’t blowing hot, kept saying low coolant, would add half gal to gallon of antifreeze.
ANSWER : Hi there. When the heater doesn’t work, it’s commonly accompanied by an overheating problem. This could be caused by a broken heater core, a clogged heater core or perhaps as you’ve indicated, a broken head gasket. I would highly recommend that you have a professional mobile mechanic complete a car is overheating inspection so they can pinpoint the source of this issue and recommend the right repairs.

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Slight overheat low coolant
ANSWER : This could be caused by a variety of things such as low coolant levels, a clogged heater core, a faulty thermostat, a faulty blower motor or heater core bypass hoses that are leaking. I would also recommend checking the water pump to be sure it is operating as it should. I would suggest having an expert from YourMechanic come to your home to diagnose and repair.

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Low coolant level light on, low oil light on
ANSWER : Hello. Several owners of the BMW 750i have complained of this issue. The usual fix required is a PCM reflash. The PCM flash will have to be done by BMW but it is the most likely cause and most common fix for this issue. If you would like to have this verified, you may consider having a certified technician, like one from YourMechanic, come to your car’s location to diagnose the coolant and oil light to see if there is a different problem.

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97 chevy lumina low coolant light is blinking on and off and the coolant reservoir is bubbling over but car is not overheating wha
ANSWER : Hello, and thank you for writing in. The cooling system overflows into the reservoir when the pressure rises and the coolant is forced to go somewhere. This can mean a few different issues are occurring, but you should start with having your radiator cap pressure tested. If the cap is not regulating coolant pressure, it will cause your symptoms, and further damaged down the line. If the cap tests okay, then you will want to look into your thermostat. You can also check the actual temperature of the engine with an external thermometer (like a infrared thermometer), to see if the engine is in fact overheating or not (as your dashboard gauge does not always accurate depending on the functionality of the cooling system). For more help with the cooling system issue, contact our service department to schedule an appointment.

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What does the Coolant Level Low Add Coolant message mean?
ANSWER : The Coolant Level Low Add Coolant message appears on your driver information center (DIC) when the engine has an insufficient amount of coolant. After adding more coolant, the DIC will turn off this message.

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Possible coolant in my oil but no oil in the coolant. Use about 1 l of coolant per 100km.
ANSWER : Check the transmission fluid. If all testing eliminates the head gasket, cracked cylinder head, etc, it may be a cracked radiator.Transmission fluid is sent forward to the radiator to be cooled. Ir runs into what is typically called the "side tanks" of the radiator. So the transmission fluid and coolant are both flowing through the radiator and kept apart just as the engine oil and coolant are kept apart in the engine by the head gasket, coolant and oil passages, etc. If the tank in the radiator is cracked internally, transmission fluid may actually be forced into the coolant as transmission fluid is under higher pressure than the coolant. Short of a cracked head gasket, cylinder head, or engine block, it’s really the only other source of any type of oil getting into the coolant unless the vehicle is equipped with an engine oil cooler as well.

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