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Ford Mustang Cabin Air Filter Replacement Guide
How to change the A/C system's cabin air filter element in a sixth generation 2015 to 2022 Ford Mustang.

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2019 Mustang Glove Box
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HVAC Blower Motor
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Filter Access Cover
This automotive maintenance tutorial was specifically written to assist owners of the S550 sixth generation 2015, 2016, 2017, 2018, 2019, 2020, 2021 and 2022 Ford Mustang in cleaning or changing the A/C system's cabin air filter element located in the HVAC blower motor housing.

(The 7th generation S650 Ford Mustang is supposed to be released in 2022 as a 2023 model year vehicle.)

Owners of other Ford and Lincoln vehicles such as the Fusion, Taurus, Escape, EcoSport, Flex, Expedition, Bronco, Ranger, Transit, F-150, C-Max, Fiesta, Focus, Edge, MKZ, Continental, Corsair, Nautilus, Aviator and Navigator may also find these DIY instructions to be helpful.

A few compatible replacement filters with their part numbers are as follows: Fram CF12151, Premium Guard PC8155X, Purolator C38155, K&N VF2053, EcoGard XC10590 and Wix WP10195.

The only tool needed to access and replace the cabin air filter is a Torx T15 star bit screwdriver.

The first step is to fully open the passenger door and then swing your head under the glove box.

Locate the round HVAC blower motor housing.

The rectangular shaped black plastic filter access cover is situated just to the right of the blower motor housing (closer to the passenger door).

The access cover is held in place by a single Torx T-15 screw.



 

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Locate Single Screw
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Loosen Counterclockwise
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Remove Silver Screw
Loosen the silver metal screw by turning it in the counterclockwise direction with the Torx T15 star bit screwdriver.

Set the screw aside in a safe place.

(Some early 6th generation Mustangs might instead be equipped with a Torx T20 screw on the filter cover.)

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Screw Removed
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Pull Open Filter Cover
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Filter Cover Removed
Grasp the handle on the filter cover and pull it off.

Set the filter access cover aside in a safe place.

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Old Filter Exposed
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Pull Down Old Air Filter
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Old Filter Removed
Once the cover has been removed, you'll be able to see the exposed white edge of the old filter element.

Gently pull the old filter straight down out of the slot.

The OEM (original equipment manufacturer) filter part number is Motorcraft FP78.

Take a look at the edge of the old filter and you'll see the "Air Flow" arrow pointing to the left towards the blower motor housing and the center of the vehicle.

If the old filter is dark grey or black and clogged with dirt, dust, pollen, hair, leaves, insects, twigs, sand, soot or other debris, it should be replaced with a new element.

If the old filter is relatively clean, just tap out the large debris and remove any fine dust with a vacuum cleaner.

Check the filter slot for any large debris such as leaves or twigs.

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Empty Filter Slot
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<-- Air Flow, Left, Driver
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Slide In New Filter
If the new filter has an "Air Flow" arrow, make sure it is pointing towards the left at the middle of the car.

I recommend buying the Premium Guard PC8155X cabin air filter since it has excellent reviews from other 6th generation Mustang owners.

Carefully slide the new air filter up into the slot.

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New Filter Installed
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Two Tabs - Filter Cover
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Two Slots - Filter Housing
Make sure the new filter is fully seated in the slot.

Line up the black plastic filter access cover with the slot.

Make sure the two plastic tabs on the cover are inserted into their corresponding slots.

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Re-Insert Tabs - Close
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Tighten Screw Clockwise
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Filter Change Complete!
Swing closed the other side of the cover.

Replace the screw by turning it in the clockwise direction with the Torx T15 screwdriver until it is snug.

Try to avoid over tightening the screw to prevent from damaging the filter cover.

Double check that the filter cover is securely installed.

(I initialed had the two plastic tabs resting on the outside of the slots rather than inside of them so the filter cover was slightly ajar.)

Be sure to record the filter change in your vehicle's service records.

Enjoy the fresh clean air from your A/C system!

The service interval specification in the owner's manual for the passenger compartment air filter is to change it every 20,000 miles (or every 32,000 km).

For more, please check out all of the 2015-2022 Ford Mustang DIY Repair & Maintenance Guides.
 

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