7 Reasons Why BMW Climate Control Not Working

BMWs are fun to drive. But if the climate control isn’t working, your drive can be much less pleasant. There are several reasons why BMW’s climate control might not be functioning. We will be going into detail, outlining some of the most common causes.

Common Problems

Each car brand has its climate control system. Unfortunately, BMW’s climate control system is not the most reliable. Below are listed some of the most common problems that might be causing your climate control not to work.


As we know, modern cars work via complex wiring and electrical systems. Sometimes, a faulty electrical connection or a blown fuse can affect the climate control system. Old wiring is another cause the climate control not working.

Several cases are reported each year where the climate control stack simply stops working. The first step is to locate the fuse panel. Once done, check if any of the fuses related to the climate control need replacement.

Up next is the wiring. A multimeter helps track the issue down. This step can eat up a lot of time but can save money if you do it yourself.

Lastly, inspect the connections. Even if they look fine from the outside, inspect them carefully. Unplug each one and check for any corrosion. Cleaning each connection point with contact spray will prevent problems.


Refrigerant Leaks

Another common cause of climate control problems is a refrigerant leak in the air conditioning system. If your BMW’s AC isn’t cooling properly, it could be because the refrigerant levels are too low.

Look at all the hoses and connections to figure out what is wrong. Check for any water or frost. Repair the leak before adding new refrigerant to the system to fix this problem. Local auto parts shops sell A/C refrigerant in a can. Add that and see if the climate control is back to normal.

Defective Compressor

The clutch pack activating the A/C compressor often fails on BMWs. The compressor helps to push coolant and refrigerant throughout the system. If it’s broken, then climate control won’t work correctly. In some cases, it might not even turn on at all.

Inspect the compressor for any damage. If the belt isn’t moving, you will need to replace it with a new one. Lastly, there might be an electrical problem in the compressor. To check for this, use a voltmeter to measure the power going into and out of the compressor.

Broken Belt

Belts help to turn engine accessories such as water pumps and A/C compressors. If one of them is broken, it will significantly affect climate control. Inspect all belts and pulleys for any signs of wear and tear or damage. Make sure they’re all tight and replace them if necessary.

If the belt has completely snapped off, you must replace it as soon as possible. Contact a local BMW specialist for the correct part number and installation advice.

Clogged Vents

The climate control system in your BMW is designed with multiple for airflow. If the air filter is not changed on time, airflow will be restricted. This can cause the climate system not to work correctly.

Clean the air vents and replace your filters with new ones. Anyone can do this job with a bit of mechanical knowledge.

Sensor Issues

The climate control system in your BMW uses sensors. These sensors measure the temperature inside and outside your car and other things like humidity. If one of these sensors is not working right, it will cause problems with climate control.

Scanning the car for error codes with a dedicated reader helps identify any sensor problems. If it is found that a sensor has failed, replace it with a new one.

Temperature not set correctly

Older BMWs have a sliding wheel that lets you pick the temperature for the vents. Most climate controls are digital, but it might not look like it’s working if you move the sliding wheel. Make sure the dial is centered before deciding the climate control is not working.

Also, check the air conditioning setting. Sometimes the climate control gets stuck in one mode, the “OFF” mode. In such cases, resetting the climate control system is required to fix this problem.

Can Climate Control Modules be Repaired?

Yes, climate control modules are repairable. Unfortunately, the labor and the cost of the part can be expensive. In most cases, buying a secondhand module is cheaper and easier than attempting to repair one.

You can look for a used climate control module for your BMW in the junkyard or marketplace. Make sure you clean every connection point with contact spray before installing it. Once you have installed it, test the climate control system to see if it works correctly.

How to Reset the Ambient Air Sensor?

Resetting the ambient air sensor is easy. With the engine on, press and hold the A/C and Recirculation button. After about 10 seconds, release the buttons. This will reset the climate control system and the ambient air temperature sensor.

Will my Car Run Without a Functional Climate Control System?

The car will still run if your car’s climate control isn’t working. But it will be very hot or cold inside the car. However, staying in the car for a long time will make it uncomfortable.

Steps to take if your BMW Climate Control Isn’t Working:

  • Inspect the compressor for any damage
  • Replace broken belts
  • Clean the air vents and replace the filters
  • Scan the car for error codes with a dedicated reader
  • Center dials on the climate control system
  • Reset the climate control system
  • Look for a used climate control module in junkyards or marketplace and install it
  • Test the climate control system to see if it is working
  • Reset the ambient air sensor using A/C and Recirculation buttons.

If none of the above steps fix your climate control issue, contact a certified BMW specialist for professional help. They can accurately diagnose, repair, or replace any faulty parts in your vehicle.

In conclusion, if your BMW climate control is not working correctly, there are several steps you can take to troubleshoot the issue. By following these steps, you should be able to diagnose and repair your climate control system without any significant issues.