Archive for the ‘BMW Repair’ Category

Why is my BMW Engine Overheating?

BMW engine overheating issues are a common complaint among many BMW owners. Some of the main causes of overheating in BMWs include coolant leaks, a clogged coolant system, water pump failure, and using the wrong type of coolant. To correctly diagnose the symptoms, it’s important to have your car inspected by a certified, professional mechanic who is an expert at repairing and maintaining these finely tuned driving machines.

Symptoms of a BMW Engine Overheating

If you drive a BMW and are worried about your car’s engine overheating, keep an eye out for the following symptoms.  If you notice any of these signs, we recommend taking your car to a certified BMW maintenance facility at the earliest opportunity.

Engine Overheating Light

The BMW engine overheating warning light is designed to give drivers an accurate reading of engine temperature.  If an engine exceeds the maximum safe temperature for the operation of your vehicle, the engine overheating light turns on.  You can also check the temperature gauge, which indicates excessive engine heat by rising above the red or hovering near the top of the gauge.

Thumping Noises

If you notice strange thumping sounds coming from your vehicle, engine overheating could be the cause.  Thumping sounds could be caused by a malfunction in the thermostat which regulates the flow of coolant between the radiator and the engine. Failure of this thermo sensor causes the coolant in a BMW engine to become superheated, which then makes a thumping noise as it mixes with the cold coolant coming from the radiator.

Engine Ticking Sound

A ticking noise can be another warning sign your BMW engine is overheating. A BMW engine is lubricated with a protective layer of engine oil. When the oil becomes too hot, it loses viscosity and is too thin to properly act as a lubricant, which causes the moving parts of the engine to make a distinct ticking sound.

Hood is Hot to the Touch or Steam Coming from Under the Hood

One of the easiest ways to identify an overheating engine is to touch the hood. If it is too hot to touch after 10 seconds, the engine is likely overheating.  Another clear indicator of BMW engine overheating is steam escaping from under the hood. This occurs when the coolant inside the reservoir starts to boil, causing steam to be released.

Causes of Engine Overheating

Some of the most common BMW overheating causes include:

Engine Coolant Leak

Every internal combustion engine requires coolant to keep the engine temperature at optimal levels.  If your coolant system has sprung a leak, your car’s engine is most likely not receiving an adequate amount of coolant for it to function properly.  If you suspect a coolant leak, check the ground under your car for wet spots; this could be an indication that your BMW is losing coolant.

Coolant System Restriction

BMW engine overheating issues can also be caused by a restricted cooling system. Over time, debris and natural dirt buildup can prevent coolant from circulating through the engine properly, causing the engine to overheat.  A malfunctioning thermostat can also lead to overheating.

Malfunctioning Water Pump

Engine overheating can also be caused by a faulty water pump.  Water pumps are crucial in maintaining the correct engine temperature by ensuring adequate coolant circulation. BMW water pumps usually need to be serviced or replaced on a regular basis.

Incorrect Coolant Type

BMW engines require a specific type of coolant to function at optimal performance levels and prevent engine overheating. Each BMW model requires a coolant with a specific viscosity for its unique engine design. For more information on choosing the best coolant to prevent your BMW engine overheating, check your owner’s manual, or contact a BMW service center.

How to fix BMW Engine Overheating Issues?

If you suspect your BMW engine is overheating, your most reliable option is to contact an experienced BMW technician or service center. Cooling system maintenance and repair is best done by a seasoned professional who can accurately diagnose the engine overheating cause, whether it is from a coolant leak, worn water pump, malfunctioning engine cooling fan, or something as simple as a broken radiator cap.

BMW owners in the South Orange County area trust the technicians at Star Motors. Residents have voted our shop as the Best Auto Repair in Orange County for 11 years in a row. Don’t wait until you’re stranded on the side of the road with an overheated engine. Make an appointment online or give us a call if you suspect any engine issues or want to follow up with routine maintenance services.

Frequently Asked Questions


What happens if you drive with an overheated engine?
Driving with an overheating engine is dangerous! Excess engine heat can cause radiator hoses and seals to weaken and break, releasing coolant and antifreeze. Driving with an overheated engine can also cause warped cylinder heads, which can lead to a blown head gasket, one of the most expensive repair jobs for BMWs. Welds, seals, belts, and wiring can also be compromised and can cascade into severe damage to the steering column and fuel pump.
How do I know if my BMW is overheating?
One of the surest ways to detect BMW engine overheating is if your car’s engine temperature light comes on, or if the temperature gauge rises into the red zone. Other signs include thick white smoke coming from the exhaust system, unpleasant odors seeping through the AC vents, and fluid leaks under your parked car. You might also notice that your hood is hot to the touch, steam coming from under the hood, clicking noises or thumping, and/or decreased engine performance.
How do I stop my engine from overheating?
Regular maintenance from a trusted BMW maintenance service center is the first step to preventing BMW engine overheating. Some other effective preventative measures include:

  • Pay attention to your car’s engine overheating warning light and temperature gauge!
  • Keep on top of your coolant levels and watches for signs of leaks.
  • If your coolant levels are low, make sure you add the correct type of coolant for your BMW engine.
  • Get a radiator flush. Servicing your radiator clears out any old coolant and antifreeze, which can be contaminated with debris that clogs cooling systems.
  • Replacing your old thermostat with a high-performance version is an inexpensive fix.

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Why Does the BMW Suddenly Lose Propulsion?

As a vehicle owner, you want to know that your vehicle is safe. You need to know that each time you get into your car and take it on the road, you and your passengers will be protected. However, each brand has its issues and each make/model too. BMW has issues from time to time with the propulsion suddenly going away, right in the middle of driving, leaving you powerless to continue down the road. However, there are reasons for this, and signs you can look for before it happens to you.

Insufficient Fuel

If you are driving along and your vehicle is working just fine, but then suddenly loses power when you are trying to accelerate, it could be an issue with the fuel delivery. A car functioning to optimum capacity should respond immediately when you press the accelerator. If you step on your accelerator and there isn’t a fast, immediate response, it could be indicative of a fuel delivery problem. There are many causes of insufficient fuel delivery.

One of the most common causes is a clogged or broken fuel injector. As you regularly drive your BMW, the small passages of the fuel injector can become filled with dirt or debris, like clogged arteries in the body. If this happens, the fuel supply to your injector becomes limited. The result is slow acceleration or a sudden loss of propulsion. You might also notice that as you regularly drive your vehicle, the fuel economy decreases and you start consuming more fuel than normal.

Another potential cause is a defective fuel pump. The fuel pump on your car is responsible for bringing gas to your engine by way of the fuel lines. If the pump is faltering, then your vehicle might hesitate when you try to accelerate or lose propulsion suddenly. The fuel filter is designed to clean impurities from your gas, but if that gets clogged (which it naturally will over time) then less and less fuel is making it to your injectors. Essentially all of these components can stop working properly because they get clogged which is why it is important to bring in your vehicle and have the fuel filters and other components checked and cleaned regularly.

Other causes could be a failing catalytic converter which would cause problems accelerating with your engine running hot at the same time. If you notice the smell of gas or a puddle of gas under your car, you might have a leaking fuel line which would stop fuel from reaching the injectors.

Lack of Power

A loss of power, the sudden loss of propulsion while driving, could be caused by a problem in your exhaust system. If you have bad cylinders or misfiring spark plugs, it can consume power that your car needs to function properly. If oil or antifreeze has made its way into the exhaust system, this will also rob it of the power supply necessary to keep the car moving forward.

If your loss of propulsion is from misfiring spark plugs, then the amount of power loss you experience while driving will correspond with the rate of the misfiring spark plugs. If you leave this problem be and do not bring in your BMW to have it repaired, it will only get worse. Eventually, regular misfiring will increase exhaust emissions and continually choke off power supply to your engine.

In some situations, overheating in your engine can damage the cylinder heads and this can produce failure in the head gasket. If your head gasket stops working properly, it can cause cracks in your cylinder head. One sure way to note this symptom is if you see white smoke coming out of your exhaust pipe. White smoke is a classic cracked head gasket sign because it means the crack allowed coolant fluid into your exhaust system.

Hire Professionals

That said, if you are having any of these issues BMW Propulsion Issue Check or you believe that your symptoms are similar, bring your BMW in to have it inspected. At Star Motors, we have a team of highly qualified professionals who work exclusively with BMW models. We are conveniently located to San Juan Capistrano, CA and other Southern Orange County areas. Call or stop by today to make an appointment!

When Should You Replace the Cabin Air Filter in Your BMW

Generally speaking, you should change the cabin air filter in your BMW every 15,000 – 20,000 miles. This may not always be the case though. The BMW model, driving conditions and seasonal changes are all contributing factors for identifying when to replace a cabin air filter. Drivers should understand the importance of replacing their filter to ensure the best quality experience out of a BMW all year long. Make an appointment with a BMW specialist for an inspection.

When you own a BMW, it’s easy to forget that they require ongoing service and maintenance in order to continue performing optimally; as they’re such excellent vehicles year-round, they rarely require significant repairs or maintenance tasks.

The cabin air filter is an important part of ongoing care because it keeps the interior of your car cleaner and helps the AC system perform well. There is more to know about the cabin air filter in your BMW, and if you’re not sure how to know when it should be replaced or serviced, continue reading to get more information:

What Does the Cabin Air Filter Do For Your BMW?

The cabin air filter in your BMW plays an important function, but it’s often a neglected part of maintenance. The cabin air filter is responsible for capturing all the dust, dirt, pollen, debris, and contaminating particles, keeping them from entering your cabin so that you and your passengers don’t breathe them in. Furthermore, it keeps the overall quality of the air inside clean so that your interior stays new and preserved longer.

How to Know When to Replace Your BMW’s Cabin Air Filter

Just like many of the other parts of your car, such as engine oil and oil filters, the cabin air filter in your BMW needs to be replaced on an ongoing basis. Once the air filter becomes dirty and compromised, air cannot pass through it efficiently, nor can it perform the function of properly filtering out debris and contaminants. Here are a few tips on how to know when you should replace your cabin air filter:

Follow the Factory Maintenance Schedule

The BMW manufacturer does a pretty excellent job of laying out all the important maintenance tasks their drivers need to follow in order to achieve optimal performance results out of their cars. The cabin air filter is certainly included in these maintenance tasks, and your specific BMW might require different maintenance intervals than others. If you’re not sure where you to find this information, start with your owner’s manual and then contact a BMW specialist for more guidance.

Have Frequent Inspections Performed

A good rule of thumb to follow to ensure that your cabin air filter is adequately replaced is to have an inspection performed every time you get your oil changed. You can ask to see the filter yourself to make sure it requires replacement. If you notice that the filter is darker, black, or covered in debris, it’s a good idea to change it right away.

What Factors Contribute to Increased Need for Air Filter Replacement?

The routine maintenance and inspections will help you stay on top of cabin air filter replacements; however, there are other factors that contribute to how often you’ll need to replace it:

Especially Dusty Roads or Driving Conditions

If you live in an area that has lots of dirt roads, or in rural communities with farmland, your BMW is likely exposed to a lot of air particles that can fill up your air filter rather quickly. It’s important to stay aware of the roads and conditions you frequently drive in and adjust your maintenance intervals accordingly.

Changing Seasons

It’s always a good idea to check your air filter before summer and after spring for a few reasons. First, you’ll want a great-working AC system for the summer months that can be brutal three-digit temperatures. Second, the Spring season usually brings a lot of excess pollen and allergens out into the air, which could significantly affect the quality of your air filter.

How Star Motors Can Help You

For over 30 years the BMW experts here at Star Motors BMW AC Vent have made cabin air filter inspections part of their routine care each time our clients bring their cars to us. In the areas of San Juan Capistrano and Southern Orange County, CA, the air can be especially filled with contaminants, dirt, and debris—particularly during spring and summer months that are often dryer. We always remind our clients that their air filters need to be checked and follow through with such tasks to ensure they’re never without quality air inside their vehicles. If you’d like to schedule an oil change and/or cabin air filter inspection, please call us directly or make an appointment through our website.