Learning From Cabin Air Filter Installs (Video)

Learning From Cabin Air Filter Installs (Video)

Take your time installing cabin air filters because a rushed job could have repercussions. This video is sponsored by FRAM.


Recently, BMW issued a TSB on cabin air filter replacement for some 3 Series and 4 Series models. This TSB applies to vehicles with automatic temperature control HVAC systems where the recirculation door is close to the cabin air filter housing.

TSB SI B64 03 21 describes a situation where after replacing the cabin air filter, the customer notices that the ventilation system airflow rate is noticeably less. This leads to perceived lower cooling power.

The customer may also notice that external odors enter the vehicle. The cause of the complaint is that the fresh air flap can be hit by the new filter and pushed past its normal end stop. The regular opening and closing of the fresh air flap can no longer be guaranteed. To prevent this situation, when inserting the cabin air filter, it’s essential to ensure that the air recirculation function on the air conditioning control panel is activated and in the closed position.

There are two things to learn from this TSB when replacing a cabin air filter on any late model vehicle.

First, if you’re unsure about the replacement procedure for a vehicle, look at the service information and look for any TSBs that might apply.

Second, many vehicles have position sensors on the doors and flaps. If a flap is forced open or closed, you might have to recalibrate the door position with a scan tool.

So the next time you service a cabin air filter on a vehicle you are seeing for the first time, take your time and never force a filter into a housing.

This video is sponsored by FRAM.

You May Also Like

ABS Speed Sensors (VIDEO)

How does the vehicle know when to release the brakes? You guessed it. Active ABS speed sensors. Sponsored by Standard.

Standard is proud to offer a complete line of more than 2,600 ABS speed sensors, gas, diesel, electric, or EV, import or domestic. Standard has you covered.

In the past decade or so, we've seen a number of new technologies in the automotive industry. One of these is Advanced Driver Assistance Systems, also known as ADAS. There are a number of systems which fall under the ADAS umbrella, so to speak. Including blindspot detection, lane keep assist, parallel parking assist, trailer backup assist, adaptive cruise control, and much, much more.

Using an Oscilloscope for Ignition Diagnosis

Use an oscilloscope for an efficient diagnosis.

Which of the Following is Least Likely to Cause a Weak Spark?

Make sure to read the question and answers carefully before selecting an answer. This video is sponsored by Autolite.

Spark Plug Procedures (VIDEO)

It’s a good idea to polish up your knowledge of engine ignition systems. This video is sponsored by Autolite.

Spark Plugs and Wires (VIDEO)

Wires should be replaced at the same time as spark plugs. This video is sponsored by Autolite.

Other Posts

Spark Plug Gap (VIDEO)

Too small of a gap can lead to a weak spark and too large a gap can lead to misfires. Sponsored by Autolite.

Finding The Source of an Oil Leak (VIDEO)

The key is to follow the trail to the farthest forward and highest up point that you can find. Sponsored by Bar’s Leaks.

GDI Fuel Pump Pressure Sensor (VIDEO)

Always measure the values with a scan tool. This video is sponsored by Carter Fuel Systems.

GDI Fuel Pumps and Diagnostic Margins (VIDEO)

A small chance can have implications for emissions and drivability. This video is sponsored by Carter Fuel Systems.