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What does blue light in car mean?

What Does The Blue C Mean On Honda Civic?

If you experience blue engine coolant temperature light, it indicates a problem. It is worth checking the engine coolant temperature light. A too-cold radiator can cause your engine to freeze up, so make sure the temperature of your antifreeze corresponds with vehicle operating temperatures.

Make sure any defects that could be causing the cold radiator are fixed before continuing; otherwise you may face more serious problems down the road.

Checking for this problem early can save you time and money in the long run by preventing bigger issues from arising later on. Always check for coolant leaks before taking any other steps; if there’s an issue, repairing it will take care of everything else.

What Does The Blue C Mean On Honda Civic?

Coolant temperatures that are too cold are indicated by a blue engine coolant temperature light. Consequently, your radiator can get too cold, leading to your engine freezing up and not starting as a result of the low temperature.

This light comes on at startup, but that is normal. Your engine just needs to warm up a bit, if that’s all it’s telling you. A routine temperature check is being performed by your vehicle’s system, and that’s normal. Additionally, it wakes up your engine before takeoff, which is a great safety feature.

The blue light usually stays on for only a few minutes at most. Especially in certain gears, it’s not a good idea to drive off right away when this happens. As soon as your car has warmed up, the blue light will go out.

The blue light may be a sign of antifreeze damage if it persists for more than two minutes. The antifreeze level should be checked after the engine has cooled down sufficiently if this happens. Your engine cannot function properly if the blue temperature warning light comes on.

Blue Engine Coolant Temperature Light Indicates A Problem

If the blue engine coolant temperature light on your Honda Civic stays on, this indicates a problem and you should take it to an auto mechanic for inspection.

Blue Engine Coolant Temperature Light Indicates A Problem

The light may also turn off if you replace the radiator or thermostat, but it will come back on again if there is further damage. You can try remedying the situation yourself by adjusting certain settings in your cars computer system, but only a professional should do this correctly.

Keep an eye out for warning signs such as overheating and poor performance; don’t ignore them just because the blue engine coolant temperature light isn’t currently flashing. In most cases, these problems can be fixed without having to bring your car into a mechanic shop – just watch for any red flags and act quickly.

Too Cold Radiator Can Cause Your Engine To Freeze Up

The blue C on your Honda Civic means that the radiator is too cold. If you notice a decrease in engine performance or freezing, it may be time to replace your radiator.

Too Cold Radiator Can Cause Your Engine To Freeze Up

You can check the temperature of the radiator with anther car’s thermometer or by using a cooling system scan tool. Replacing your radiator will fix problems and keep your car running efficiently all winter long.

Make sure to have a mechanic inspect and top off any fluids as needed during colder months – this will help avoid costly repairs in the Spring.

Make Sure The Temperature Of Your Antifreeze Is Properly Aligned With The Vehicle’s Operating Temperatures

The blue C on your Honda Civic means that the antifreeze is properly aligned with the vehicles operating temperatures. If you have a coolant leak, the blue C might turn green or black because of freezing cold weather conditions outside.

Make Sure The Temperature Of Your Antifreeze Is Properly Aligned With The Vehicle’s Operating Temperatures

Always check your cars temperature and make sure that the antifreeze level is in accordance with it before driving to ensure optimal performance and safety for both you and your car. Make sure to keep an eye on your Honda Civic while it is in operation – if there are any changes noted on this indicator, take appropriate action immediately.

Check For any Defects

Honda Civic owners may want to check for any defects that could be causing the cold radiator issue. The blue C on the engine block should not indicate a problem with the cooling system, but there are other things to look for in case of an emergency.

Check For any Defects

If your car isn’t getting as much coolant flow as it used to, you can try replacing the thermostat or bypassing the AC belt tensioner – both relatively simple fixes that could help rectify this situation quickly and easily.

Other common issues associated with Hondas include bad head gaskets and failing water pumps, so if you’re experiencing these problems too then it’s definitely time for a tune-up.

When something goes wrong with your Honda Civics cooling system, don’t hesitate to bring it in for service – it might just save your day.

What Is the Blue C Light on a Honda Civic?

If you see the blue C light on your Honda Civic, there may be a problem with your engine cooling system. Check all of the other components that affect engine cooling to make sure they’re functioning properly.

What Is the Blue C Light on a Honda Civic

If the cause is a broken thermostat or sensor, you’ll need to replace them and possibly parts of the engine cooling system as well. Make sure to check for damage before getting started. A low coolant temperature can also be caused by a clogged radiator or failed fan blade(s).

Inspect these areas carefully and address any issues immediately if they arise. Finally, always keep an eye on your car’s Coolant Temperature Gauge in order to stay ahead of potential problems down the road.

Can I Drive with Blue Coolant Light?

Driving with blue coolant light can be a good idea if you’re going to be driving in cold weather conditions. Make sure to replace your radiator when it’s time, and keep an eye on your engine oil and filter levels too.

Can I Drive with Blue Coolant Light

Changing your engine oil is particularly important in colder weather; you don’t want the car to break down due to frozen components. Finally, know when it’s safe to drive again after changing your engine oil and filter- usually around 75 degrees Fahrenheit or higher.


What does the blue temperature light mean Honda?

If the blue light on your Honda automobile is flashing, it means that the engine temperature has risen and you should drive slowly to avoid overheating.

What does blue coolant light mean?

A blue coolant light may indicate that your engine needs servicing, which might be necessary due to a problem with the thermostat or water pump. If you see this light come on, it’s important to take action right away and have your car serviced by a professional technician.

What does blue C on car mean?

If the blue engine coolant temperature light comes on in your car, it means your coolant is too cold. To fix the problem, you’ll need to check all of your thermostats and turn them up a bit, add some new coolant (if necessary), or change the radiator if needed.

What does C light mean?

When your car’s engine overheats, the C light will come on in the dash. If you see a Coolant Temperature Warning message, it means that your cooling system is failing and needs to be replaced as soon as possible.

What does a blue temperature?

Your coolant temperature sensor is defective and needs to be replaced. The thermostat isn’t set correctly, which can lead to a hot engine or even an overheating car.

The fan motor has failed or there may be something wrong with the radiator itself, such as a leaky system. You have a problem with your air conditioning; it could be due to low Freon levels, an ineffective compressor, or faulty parts in the cooling unit altogether.

How do you fix low coolant temp?

If your car’s coolant temperature is low, it could be due to a few things. Make sure all the coolant hoses are connected, check for leaks in the system and fill up your radiator with new coolant if necessary.

What do you do when your coolant light comes on?

If your car’s engine light comes on, stop and check the coolant level. If there are water pumps problems, change the air filter. Set the thermostat to a colder temperature if necessary in order to fix cooling system issues such as low or no coolant levels or an open radiator cap.

What is Honda blue coolant?

Honda Blue Coolant is specifically designed for Honda vehicles, providing long-term corrosion protection and boiling over/freezing prevention. It can be used in all metal and non-metal parts of your cooling system, protecting them from damage.

To Recap

The Blue C means that your Honda Civic has been certified by the CARB. This certification ensures that your Honda Civic meets all the California emissions requirements.

About Richard Craver

I worked as Honda service technician for a long time. I am currently enjoying a second career in industrial manufacturing. I spent a few years in aviation manufacturing after 34 years in the Acura and Honda repair field.
I am using the same skill sets that I honed over the years in the automotive industry in an industry that not only expects, but demands quality workmanship and attention to detail. LinkedIn

Blue light on dashboard — what you should know

a close up of a speedometer with a red needle.

One thing you notice right away when you turn on a car is colored lights that glow on the dashboard, giving you information about different parts of the vehicle.

For most cars, lights on the dashboard may also indicate a problem, and the color of the light shows how intensive the issue is. For example, the red color usually means danger and severe component failure.

Amber lights and yellow usually denote a less severe problem or hazard. Green and white lights indicate a feature such as a cruise control or headlights is engaged.

On the other hand, the blue light on the dashboard often indicates that your vehicle is not at the operational driving temperature yet, and it is not a cause for worry. The blue light can also be your high beam headlight indicator. This article will explain why the blue light glows on the dashboard and when it should be a cause of concern.

Can you drive with a blue coolant light on?

The blue coolant light does not affect your car’s movement. However, it would be best to wait for it to disappear before moving the vehicle.

Your coolant light displaying blue means your vehicle is not at the right temperature for operations like movement. Waiting for the car to warm up first, causing the blue light to disappear, is the best action.

In some cases, your engine may freeze, making your car unable to start. For this scenario, the blue display from the coolant icon on your dashboard means that your antifreeze (coolant) is too cold. The low temperature of the coolant can cause your radiator to be too cold, resulting in your car being unable to start.

Suppose your car starts anyway, with the coolant icon displaying blue for too long; first, switch off the vehicle. Then, wait for the engine to get cold before checking your antifreeze levels. The coolant icon looks like a flag floating on water.

It is essential to be patient while waiting for your engine to cool before checking your antifreeze levels. Checking these levels at the wrong time after switching off a car can lead to a shower of scalding hot water on the face.

The blue coolant light (when prolonged) indicates low levels of coolant in the engine. If you do not address the situation, your engine will either overheat or seize up. The long-term consequence is permanent damage to the engine from overheating.

Therefore, if your blue coolant light stays on for too long while driving, it would be best to locate the nearest car repair shop to have an auto mechanic look into the case.

What can cause low levels of coolant?

Coolants are vital because they keep the engine from overheating. When you see a blue light on your dashboard, it indicates that you have low levels of coolant in your engine. There are various symptoms of low coolant, but only a few reasons behind them.

These are two major causes of low levels of coolant in an engine:

Leaks in the coolant system

The gradual dropping of coolant levels can happen due to leaks in the system. Leaks can occur on the hoses, radiator, or radiator cap.

Asides from the blue color on the dashboard serving as a warning sign, you can also tell if your cooling system is leaking through smell. Coolant oil has a sweet odor. Perceiving this sweet odor, plus an increase in the amount of gas you buy, should tell you that you have coolant leaking.

If you experience this, take your car to the auto mechanic for repairs to avoid spending more money on situations aggravated by this one.

Insufficient coolant top-up

Sometimes, low coolant levels are not because of leakage. Most drivers are ignorant about coolant top-ups and tend not to do it until something happens. An insufficient coolant level in your car will steady the blue light on your dashboard.

The time it takes for coolant levels to drop to the point that they are too low for use depends on the car manufacturer and your driving habits. Naturally, if you often drive long distances, you should have regular maintenance checks than the average worker who only takes a few miles to work and back every day. It is best to check your coolant levels twice a year – just before winter and summer.

These two season picks are because you need sufficient coolant to take you through the summer heat, while the winter cold may come off as misleading sometimes. It is easy to assume you do not have enough coolant in the winter because temperatures drop, and the car will need more warming up than usual. Therefore, ensuring you have the right amount of coolant before the winter hits will ensure you do not worry about the blue light on your dashboard.

It helps to have comprehensive maintenance checks at regular intervals if you are too busy to understand the technicalities of your car. Your auto mechanic will notice when you need a refill on time.

What other light can the coolant indicator show?

Asides from blue, the coolant indicator can also glow red. Red color indicators often infer that there is a problem somewhere.

When your coolant indicator gives off a red colored light, your engine is overheating at that point. Overheating can happen for many reasons and should be addressed as soon as possible.

If, when starting your car, the coolant light glows blue and then progresses to red after you have driven for some time, it is a sign that your coolant levels are too low. They are so low that they cannot function properly, leaving the engine to heat up without sufficient coolants to reduce its temperature.

You should stop driving when the coolant indicator turns red and wait for the engine to cool down. The next place your vehicle should be after that is the mechanic’s workshop. Continuous usage of a car that is overheating will induce and increase damage to the engine.

Damages from overheating vary, and repairs can cost more than they should if you do not arrest the situation on time. Overheating can even cost you your entire engine. So, if you see your coolant indicator showing blue and then red lights later, have it checked immediately and save yourself money and stress.

Another blue light you may see on the dashboard

Another blue light you will see on the dashboard is the headlight indicator. Most old cars do not have this feature, but all modern cars have it. It is a safety feature that most drivers are surprisingly not aware of.

Relying on high beam headlights alone is not advisable. They are very bright over long ranges, and using them puts you at risk of blinding other drivers, which can cause a minor accident. You also risk endangering yourself in adverse weather conditions as the high beams can cause a glare.

If the headlight indicator is blue, the high beam headlights are on, while green indicates that the low beam headlights are on. The high beam symbol has five horizontal lines vertically stacked to the left of a shape resembling headlights.

When should I use my headlights?

It would help if you only use your high beam headlights when you are more than twenty feet behind another vehicle, and no heavy rain, fog, or snow is present. In case you aren’t familiar with the low-beam vs high-beam discussion, activating high beams triggers a blue light on the dash.

They are best used at night when the weather is fair, and the roads are clear. In an urban area with many cars around, your high beam headlights may inconvenience other drivers. The low beam headlights will still enable you to see where you are going (though not as far as the high beam headlights would).

Some new models have a technology that moderates your headlights for you. The technology uses your environment and the weather to control the intensity of your beam, taking it high or low when needed. However, it is a relatively new technology, and until most production cars have it installed, it would be best if you are conscious of how you use your headlights.

Our take

The blue light on the dashboard is usually nothing to worry about, and you commonly see it on two icons – coolant and high beam indicators. Blue light from the coolant indicator shows that the coolant levels are low due to leaks or extended usage, while blue light from the high beam indicator shows that the high beam headlights are on.

While the blue color of high beam headlights is for your safety in bad weather and the safety of other drivers plying the road parallel to your direction, the blue coolant light concerns the car engine. In cold weather, blue light from the coolant indicator is not something to worry about. A persistent blue coolant light indicates a possible deficiency of coolant in the cooling system.

If a red one follows the blue light, your coolant level is too low, and your engine is overheating. If you experience this, you should take your vehicle to the auto mechanic at once to prevent damage to your engine from overheating.

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Serif Pilipovic

Serif is a seasoned automotive enthusiast with a passion for cars. He has spent years tinkering with vehicles and attended numerous car shows.

Can Civilians Use Emergency and Warning Lights in Private Vehicles

In many states, different colors of lights used by EMS, police and other first responders can vary from state to state. Where a red light may be for an ambulance in one state, it may be the primary police light color in another state. Most people don’t realize that each state regulates the appropriate colors of emergency lights allowed on all vehicles. These laws include emergency police, fire and rescue, ambulance and other first response vehicles, as well as taxis, buses and both commercial and non-commercial street traffic.


Flashing emergency vehicle lights are most commonly seen on police cars, ambulances, and fire engines. These vehicles, when they are moving in response to an emergency situation, have to be allowed to move faster than the other automobiles on the road. Flashing of emergency vehicle lights, together with sirens, ensures it. First responders who work full-time with departments and drive agency vehicles usually don’t think twice about the legality of their emergency vehicle lights. However, there is a group of first responders who are always questioning whether they are in the scope of the law. Volunteer firefighters, dive teams, physicians, county coroners, volunteer EMS, and many companies that use caution vehicles in their day-to-day activities often question whether they can use emergency vehicle lights and sirens on their vehicles. There are huge legalities involved with the utilization of this type of equipment, and the laws vary from state to state. Here, we will go over basic guidelines associated with this sort of gear and who is allowed to use it.

Anyone Can Buy an Emergency Light – But Not Everyone Can Use It

As emergency vehicle light retailers, we are often pummeled with questions about the legality of our sales. Customers ask whether the lights and sirens we advertise are allowed to be used in personal vehicles, and this is where emergency vehicle light sales get complicated. Our products are available to the general public. However, not everyone can operate an emergency light in their car on public roads. What this means is you can purchase a light from us in any color, but whether or not you can use it on public roads in the United States is dictated by state statutes. Every state in the United States has written policies about who can and cannot use emergency vehicle lights. Some of the laws are laxer than others, but some even have restrictions on where lights can be mounted on a vehicle. Since state statutes vary widely from state to state, we cannot tell a customer whether gear they are considering buying can be used on the roads in their area. Instead, it is the responsibility of the purchaser, driver, and installer to make sure the lights they want to buy for their vehicle are legally allowed for use in the state they plan to operate it. To make sure customers understand emergency vehicle light state statutes, we recommend anyone who is considering purchasing lights from our online store make themselves familiar with their state’s laws before buying.

Lights for Off-Road and Private Use are Allowed

An example of when warning lights can be purchased for use by civilians and used on privately-owned vehicles is when the equipment is going to be used for off-road and private use. Farmers and private security firms are one of the biggest markets for this type of sale. Farmers may want to outfit their ATVs, tractors, and farm transportation with warning lights for use on their property. Security agencies that patrol private properties such as company parking lots, amusement parks, private recreational properties, and malls may outfit their vehicles with warning lights. When these types of customers purchase warning lights, the purpose of the acquisition is to help patrol private property. Since most state statutes only apply to the on-road use, the laws don’t prevent drivers from using emergency lights on the private land.

Understanding Emergency Vehicle Light Optional Colors

Everyone recognizes red, blue, and white lights on the road, but it’s important to note these colors aren’t the only ones allowed to be used on the road in some states. Green, yellow/amber, and purple lights are also recognized emergency vehicle light colors in many states.

Green lights are considered in many places as courtesy lights, which means that the vehicle sporting that emergency vehicle light is requesting the right of way rather than demanding it. In some states, volunteer firefighters are allowed to use green lights instead of traditional red and white that is associated with fire departments all over the US. When a volunteer firefighter uses a green light on their personal vehicle, the law in that state views the device as a courtesy light. Since the unit is not recognized as an emergency light, Move Over Laws in that state might not apply to the situation.

All white emergency vehicle lights are not a common sight on the road and are usually not operated by emergency vehicle drivers. Instead, if you see an all white emergency vehicle light set-up on the road, it is likely a caution vehicle. Caution vehicles are driven by utility companies, construction companies, storm chasers, and a few others. Since these vehicles are not emergency vehicles, these drivers cannot request the right of way from other drivers and must obey all traffic laws.

Amber warning lights are the most permissive warning light color in the United States. What this means is that most states allow a variety of vehicles to operate yellow warning lights. However, state statutes still dictate when this type of lighting can be used. For instance, in Ohio, a construction vehicle or utility company vehicle can use amber lights while parked on the side of the road, but can’t operate warning lights when the vehicle is in motion.

Purple warning lights are very rarely seen on the road today, and some emergency vehicle light retailers don’t even sell this type of gear because it isn’t popular. In states where purple lights are allowed to be used on car, it is usually restricted to use by funeral procession vehicles.

Understanding Strobe Light Legalities and Usage

Many people want to take their stock vehicle and turn it into something unique. One of the ways to do this is to change the lighting. However, not everyone can add strobe tube kits to their vehicles and operate them on the road.
Many of the details concerning the legality of aftermarket strobe lights on the highway will vary from state to state. However, there are some common themes regarding this issue that are fairly universal. They are regulations that dictate both the brightness and positioning of strobe lights, as well as the color that they’re allowed to be. If your vehicle is discovered to be in violation, substantial fines or other penalties are a likely result.

First and foremost, emergency strobe lights that are either red or blue are, by and large, disallowed. There are some exceptions, but the general spirit of the law is that civilian vehicles should not appear to have the same features as those of police.

Another general rule is that, regardless of color, there is a cap on how bright LED strobe lights can be. Typically, the limit is set at roughly the equivalent of the lighting power of 300 candles, but this is another parameter that can vary somewhat based on your location. The general idea here is that civilians can be allowed to have strobe lights, but that they shouldn’t be bright enough to compete with other major lighting components of the vehicle. In other words, you can’t have one that’s as bright as, say, your brake lights.

A Brief Overview of Florida’s Emergency Vehicle Light State Statutes

Extreme Tactical Dynamics is located in Jupiter, Florida. As a Florida business, we are very familiar with statutes regarding the use of emergency lights in our borders. Below, is a brief overview of Florida state laws concerning the utilization of the type of equipment we sell.

Florida’s laws include regulation for the different colors of lights allowed on all vehicles. Only specially designated vehicles may display red or blue lights visible from the front of the car.

While rear-facing lights such as brake lights are mandated to be red, only officially approved vehicles can show red lights visible from the front. In Florida, vehicles of the fire department, police, ambulances, the Department of Environmental Protection, the Department of Transportation, the Department of Agriculture and Consumer Services, and the Department of Corrections are allowed to use emergency lights in the case of an emergency.

In cases of emergency, police, and other authorized vehicles may use emergency lights. In any other circumstances, only police vehicles may display blue lights. Florida’s statutes are clear on the prohibition of any other vehicle to display blue lighting anywhere on the vehicle. This ensures the easy recognition of police vehicles when using flashing lights during their duties.

It is important for everybody to know your state’s regulations concerning light colors on automobiles. Not only do the rules control what sorts of gear you may attach to your vehicle, it is important to be able to avoid emergency police or fire and rescue responders while they are on the way to a critical situation. Knowing what the colors mean can help avoid dangerous situations as well as fines and other punishments.

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