Coolant reservoir dash light.

Hi Jamahl, thanks for being an expert here. Looking at my 2008 750i coolant reservoir I see very tiny small leak very small and I

My car has 80000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
The reservoir could have a crack in it or the hoses to the reservoir could have the clamps loose or the hose could be split causing the coolant leak. If there is a coolant leak, then the coolant pressure will drop and cause the water in the coolant to boil which will turn into steam. This will damage the hoses in the cooling system and also burn the head gaskets. I suggest finding the leak and repairing the leak to where there is no leak and then pressurizing the system to 15 psi with the engine off and check for any leaks. If you need further assistance with your coolant leak, then seek out a professional, such as one from Your Mechanic, to help you.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

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. A faulty coolant sensor can falsely trigger the dashboard warning light.
If the BMW coolant light is illuminated on your dashboard, it`s telling you that you need to add coolant. Some of the warning signs that indicate the engine coolant level is low include: BMW coolant light on. Low engine coolant level message on iDrive.
Why Does a Car`s Coolant Light Come on Even in Cold Weather? The coolant light glowing blue when you start your car is a warning that the engine isn`t yet up to its optimal running temperature—so don`t push the engine hard. Doing that when the engine is cold can reduce the longevity of the car`s engine.
The coolant level sensor is the electronic sensor that is responsible for measuring the coolant level of your engine. It is usually installed in the coolant reservoir or radiator, and measures the amount of coolant in the system to make sure that it is always at the proper level.
As we`ve said, the coolant light is telling you that your engine`s temperature is getting too high and this requires your immediate attention. If you continue to drive, ignoring the warning light, you are submitting your engine to temperatures that could cause permanent damage, resulting in expensive repairs.
If the coolant level warning light comes on when you are driving, the best thing to do is pull over as soon as possible in a safe place. You should then allow the engine to cool down for at least thirty minutes before attempting to go near the engine.
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.
BMWs have specific coolant requirements (nitrite and phosphate free) to prevent build-up and corrosion of aluminum components, so not just any off-the-shelf antifreeze will do.
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.
Your Check Engine Light is On

Alongside the signal that your engine is overheating, you may see your check engine light come on if your coolant temperature sensor is failing or has failed. If your car`s computer senses a problem with the signal your sensor is sending, it may trigger the check engine light.

A coolant temperature sensor (CTS) (also known as an ECT sensor or ECTS (engine coolant temperature sensor) is used to measure the temperature of the coolant/antifreeze mix in the cooling system, giving an indication of how much heat the engine is giving off.
The coolant level sensor is an important piece to making sure the overall function of your engine is running smoothly. Without the right amount of coolant, the vehicle may overheat and cause damage to the engine so this problem should be taken care of right away.
If your coolant temperature sensor is failing or has failed, do not continue driving your vehicle. You should get it fixed right away. A faulty sensor can lead to overheating. This will cause damage to your engine as well as other components, which will be very expensive to fix.
If the coolant level is dropping and there is no external leak evident, then the coolant is probably leaking internally, into the engine. If the car has recently overheated then this could have caused the head gasket to fail. If it has, it could be leaking coolant into the combustion chambers.
your coolant level is low

solution: this is potentially an easy fix. simply top up your coolant to the “max” or “full” level when the engine is cold. use a 50/50 coolant-and-water mix, as specified in your owner`s manual.

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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No dash lights, back right tail light is out, no parking lights. Brake lights work though as does head lights.
ANSWER : Hi there. In many cases, when you have electrical problems like you’re describing, it’s caused by multiple electrical component failure. It’s likely that a few electrical relays are not working; especially if you have systems that utilize the same components (such as your brake light and tail lights). I would recommend having a professional mobile mechanic come to your location to complete an electrical problems inspection first, so they can pinpoint what is damaged and recommend the right repairs.

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First, the fuse 19 keeps blowing. When I hit the brake pedal my dash lights up. The third brake light acts like a running light.
ANSWER : Hi there. Check the wiring on the vehicle to the tail and brake lights. There is a cross short that is causing the lights to blow the fuses and make the tail lights brighter than normal. If you need further assistance with your electrical issues, then seek out a professional, such as one from Your Mechanic, to help you.

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signals, daytime running lights are not working, park brake light on dash is on steady and chime is dinging steady 4×4 wont engage
ANSWER : This is likely a brake light switch problem. I would suggest testing the brake light switch which should be located down by the brake pedal. This may also be a computer problem as well as indicated by the other lights on in the dash. I would recommend having an expert from YourMechanic come to your home to possibly replace the brake light switch and diagnose with a scanning tool which will download useful data from the truck’s computer indicating what specifically the problem may be.

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Abs light, emergency brake light, steering wheel assist light, engine light, EPC light, traction control light
ANSWER : Hello, thank you for writing in. The vehicle does utilize a lot of the same sensors for these systems. Are there any other codes that are coming up when this code appears? If so you will want to take these into consideration when processing the repair and making a diagnosis. The module may be bad, and replacing it should fix the problem. The lights should turn off once the main computer recognizes the new module and the sensors sync up. If you believe the sensors need to be cleaned you may do so. Do as minimal as possible to make sure you are not damaging the sensor or disrupting the wiring inside. A bad connection would make the lights stay on. With so many lights that are effected by the module being illuminated, the module is likely bad or does not have a connection. Check the connection first and then resort to replacing the unit. For more help with these electrical tests, contact our service department.

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Low coolant light comes on when AC, defrost or heater is on, but only if the car is in gear and stopped, what’s wrong with my car?
ANSWER : First, you want to make sure your cooling system is full. Check the radiator not the coolant jug. And check it when it is cold. If it needs coolant, add some. Of course, I don’t feel this problem is an actual low coolant condition. I would expect to find an electrical failure in the instrument cluster or from a component or wiring harness that is connected to the instrument cluster.

As a technician, I have access to reports from technicians across the country. I could not find any reports of this problem, so diagnosing this will require an experienced tech as this is not a common problem. In addition, this happens at intermittent times making it difficult to recreate. The most challenging part of this diagnosis will be recreating the symptom. I suspect it has something to do with the brake switch circuitry because it only seems to happen when you have your foot on the brake. I would begin my diagnosis there with a wiring diagram and test light in hand. The brake switch, instrument cluster, and environmental controls all interact with each other. Something is crossed either because of a failed module or damaged wiring in a harness.

Aside from making sure the coolant is full, this will not likely leave you on the side of the road. If you take it in to be diagnosed, be prepared for them to spend more time than usual to figure it out. Since it isn’t a key problem, you may need to live with it until it completely fails making it much easier to diagnose. Either way, I do recommend having a certified mechanic diagnose the warning light to make sure there isn’t anything serious going on.

Good luck.

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Dash, Tail/brake, dome, trunk, glovebox, and door lights won’t work, dash doing weird things.
ANSWER : Hi there. Sure would appear a lot is going on electrically all at once. This could be, a problem in the PDC (power distribution center). The PDC is typically located under the hood and contains numerous fuses and relays. I don’t believe any one fuse will resolve all of the electrical issues. There is a possibility, it is not a power supply issue. It may be, the result of a poor electrical ground common to the inoperative components. Proper circuit testing should be performed. This would confirm the cause of multiple electrical failures. I recommend having your vehicle’s electrical problems be diagnosed and repaired by a certified technician, such as one from YourMechanic.

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2012 equinox reduced power light engine light and traction light came on. Lost a lot of power got home and all light except engine
ANSWER : Your car has what is called a "safe mode" that will be engaged by the computer when it detects that something critical has gone wrong related to any of the major components in your engine chassis or power train. This may be related to a number of things, most of which should have been registered in the computer when the check engine light came on. I recommend having an expert from YourMechanic come to your location to inspect your check engine light and diagnose any codes registered by your vehicle’s computer.

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