Fixing Your BMW’s HVAC Blower

how to fix bmw HVAC blower motor

Summer heat waves seem to be the time when something goes wrong with our air conditioning systems in our cars. At Eurofed Automotive, we are experts at fixing automobiles, including HVAC systems. In this article, we’ll discuss some problems that happen with your vehicle’s HVAC system as well as some tips to fix them.

Common Heating and Air Conditioning Problems in Automobiles

Blower Motor

The blower motor is a mechanical device that controls the fan in the HVAC system. The motor, like most mechanical devices, is subject to wear and tear over time. Living in climates where temperatures can be extreme or changing frequently can mean more opportunities for the blower motor to wear out.

Resistor or Climate Control Module

Depending on your car, you either have a resistor or climate control module. If the fan in your car has five or six set speeds, your car has a resistor. A resistor is an electrical unit that controls the speed of the fan. In some cases, the resistor will fail and your fan will no longer have multiple speeds; it will simply have on and off. In other cases, electrical issues such as a blown fuse can cause the resistor to stop working.

Thermostat

The thermostat controls the temperature in the HVAC system. In most cases, when this fails, you will lose the ability to heat or cool your car. Before it fails, you may find that it works some of the time, but not all of the time. You may find the cool air isn’t as cool as it should be or the heat isn’t as warm as expected. This won’t affect the blower in the HVAC system, but it is just as frustrating.

Diagnosing Resistor Failure from Blower Motor Failure

There is one way to determine if the resistor is failing or if the blower motor has failed. Unfortunately, if either one is in the process of failing but hasn’t completely failed yet, some of the symptoms can be identical. If you have a climate control module in your vehicle, this test will not work. However, if your vehicle has an adjustable blower, then this test may give you some helpful information.

First, turn off your car and sit in the driver’s seat. Turn the AC off and turn the fan off. Now turn the car on but don’t start the engine. Usually, that is the first stop on the key start or a short click on the automatic start vehicles.

Now, turn the fan on its lowest setting. Listen closely, and with your free hand, feel the air pressure. If you can hear the fan or feel a change in air pressure between the off position and the first setting, make a note of this. If you cannot hear or feel anything, then the blower motor is likely the problem.

Next, turn the fan up to a higher setting. If you can feel the increase in pressure and hear the change in the fan speed/power, then the problem is probably not the resistor. If you hear any kind of grinding, whining, or clicking sounds, the problem is likely the blower motor. If you did not feel any change between the first setting and the second setting of the fan, then the problem is likely the resistor.

Unfortunately, the above diagnostic method is not foolproof. In many cases, issues with the HVAC system happen in sets. This is because the resistor will have to work harder when the blower motor is starting to fail, and the blower motor will have more stress placed on it when the resistor is starting to fail. The best thing you can do when you start to notice a problem is to bring your car in for differential diagnosis and find out exactly what is going wrong before anything else is impacted.

fix your BMW's HVAC

If you would like to experience the EUROFED DIFFERENCE give us a call or send us an email for more information on our services or to schedule an appointment. To find a location nearest you check out our Home page for more information.

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BMW Auto Repair Shop

A shop full of BMW’s both new and old is a heavenly sight for us here at Johns Creek🤤😍 ! Find out for yourself why so many fellow owners trust us their BMW’s

Services We Offer for BMW

  • Carbon Cleaning Services
  • Oil Leak Repairs
  • VANOS Service
  • Timing Service
  • Check Engine Light Diagnostic
  • Brake Service
  • Clutch Service
  • Battery Replacement
  • Electrical Repairs
  • Factory Scheduled Maintenance
  • Wheel Alignment
  • Rod-Bearing Service
  • Air Condition Services
  • Fluid Checks and Changes
  • Suspension Repairs
BMW Auto Repair Shop

If you would like to experience the EUROFED DIFFERENCE give us a call or send us an email for more information on our services or to schedule an appointment. To find a location nearest you check out our Home page for more information.

Written By: Will Bofill

BMW Repair Services – Fixing the Ignition Coil

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Eurofed Stone Mountain Auto Repair Shop

Once you have had the experience of driving a BMW, there is a chance you may not be interested in any other brand. This is mainly because BMWs are very reliable cars – something every BMW owner can attest to. However, like every other  brand, some models are less reliable than others due to  certain components that are prone to malfunction. In the BMW 318i, M3 (e90) and X5, that component is the ignition coil.

How Does The Ignition Coil Work?

The ignition coil is responsible for turning low voltage to high-voltage electrical power which is then sent to the spark plugs. This high voltage current sent to the spark plugs ignites the fuel in the engine to power up the car. If the ignition coil of your car is malfunctioning, you may be unable to start your car and/or keep it running smoothly.

How to Tell if Your Ignition Coil is Malfunctioning

A bad ignition coil will give off several warning signs. As the ignition coil is an engine component, one of the first signs of a possibly failing coil is an illuminated check engine light. You may also experience engine misfiring and stalling accompanied by a snapping sound from the engine compartment. Sometimes your car may not start at all.

The spark generated by the ignition coil lights the mixture of fuel and air in the engine causing it to start. If the ignition coil is not working properly, you may experience poor fuel economy as a lot of unburned fuel will be wasted. A malfunctioning ignition coil is capable of damaging the engine of your car and leaving you stranded on the road. Take your car to an auto repair facility immediately you begin to experience any of the above-mentioned signs.

What are the Causes of Bad Ignition Coils?

The ignition coil, ignition wires, and spark plugs work hand in hand to fire up the engine, thus if the spark plugs or ignition wires are not working properly, the work output of the coil will definitely be affected. The ignition coil in your engine could also be damaged by oils that leak onto the coils. As such, if there is an oil leak in the engine compartment, especially if the leaking fluid is hot and it is getting to the ignition coils, it wouldn’t take much longer before the coils begin to malfunction.

Also, if there is too much resistance in the wires of the spark plugs, the ignition coil may experience premature failure. Bad ignition coils could, in turn, cause severe damages to your catalytic converter and engine. You should have a mechanic look at your BMW once you suspect a problem before it escalates to a more serious issue that could incur more bills.

How to Fix a Bad Ignition Coil

Try not to drive your car with a bad ignition system, not only is it dangerous, you could damage other components of your car engine in the process. When you bring in your car suspecting an ignition coil problem, we will first examine and test the components of the ignition system to determine the root cause of the problem.

If the coil is faulty, we will extract and replace the failing ignition coil. Considering the fact that the coils and spark plugs work together, it is always best to change both components at once. However, depending on the system of your BMW, replacing the spark plugs may not be necessary.

All the same, the manufacturers recommend replacing your ignition coils and spark plugs regularly at scheduled intervals. Not only does this greatly reduce the chances of a breakdown, but it will also keep the ignition system of your BMW in superb condition so you can enjoy a smooth drive.

If your BMW is having issues starting or running smoothly, bring it in for an inspection. To experience our Ignition Service and Repair, schedule your appointment here or contact us here.