How to replace engine and passenger compartment air filters

Maintenance is still factored into the sharp depreciation affecting the luxury car market. Fear of breaking expensive parts, sky-high mechanic bills, and overly complex electronics can certainly explain why I recently managed to buy a 2006 Porsche Cayenne Turbo for less than a tenth of its original price ( hopefully on Craigslist, too).

My Porsche SUV came with records dating back to 2008 that covered major known issues with the model, including replacing the driveshaft assembly, rebuilding the air suspension system, and recalling the fluid pipe. cooling metal. But I still have a few outstanding maintenance items that aren’t covered on the to-do list – or at least to check, in case they’ve been dealt with as part of a major service along the way.

Near the top of the list, replacing dual engine, single cabin air filters has proven to be a relatively inexpensive endeavor, totaling just over $ 50 FCP Euro, with free shipping and hopefully. the, This aligned lifetime replacement warranty for the next time. But in classic Cayenne style, the actual job ended up taking a lot longer than you expected, so follow here for a quick primer before you get your hands dirty.

Go to air filters

Porsche Cayenne 2 air filters

via Michael Van Runkle / HotCars

The short list of simple tools should be limited to a flathead screwdriver, a Phillips screwdriver, T20 and T30 Torx bits, and an eight millimeter socket. But of course, if someone has played with any of this stuff before, the random fasteners might require more tools, so my advice would be to bring the whole box just in case.

The Cayenne’s big 4.5-liter twin-turbo V8 is known to fit snugly in the engine bay, which manages to look pretty tidy thanks to a bunch of different trim panels. But those panels have to come off to do just about any maintenance job, so remove the passenger side part first. First, remove the wiper fluid cap, then turn the plastic screws quarter-turn until they pop out. A T20 Torx screw under the wiper fluid reservoir will also need to come off.

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A better view of the engine compartment

Porsche Cayenne 3 air filters

via Michael Van Runkle / HotCars

The other side is a bit easier, just remove the quarter-turn plastic screws to reveal the brake fluid reservoir and starter connections. No Torx is required here to give a much better view of the engine compartment and accessories.

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German engineering at its best

Porsche Cayenne 4 air filters

via Michael Van Runkle / HotCars

To access the air boxes and filters, Porsche and Volkswagen engineers brought out what looks like a classic MacGyver and used some very weird plastic bolts. Rotate the Torx T30 tops until a small notch on the plastic lines up somewhat with a matching piece on the airbox – some movement will be needed here until they can lift and go out.

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Remove more trim panels

Porsche Cayenne 7 air filters

via Michael Van Runkle / HotCars

At this point, I decided to remove the front-most trim pieces as well. The whole job might be possible without doing it, but taking a few seconds to remove a few more quarter-turn screws allows for slightly easier access and a little more leeway.

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Porsche Cayenne 6 air filters

via Michael Van Runkle / HotCars

For Cayennes equipped with the famous air suspension system, a super cool feature that definitely attracted me to buy this truck, the added complexity appears even when replacing the air filter. On the passenger side airbox, a hose carries clean air through the engine compartment to the air compressor – this hose connects at the bottom, as seen above.

To disconnect the hose, first use a flat head to gently push the green plastic clip toward the air box. Then press down on the right angle neck of the pipe with one hand and use the flat head to push the plastic tab closer to the box towards your hand.

This step required a bit of finesse, but now that I’ve done it once, it will of course be infinitely easier the next time. Be careful not to break the brittle plastic, which suffers from endless thermal cycles from being located so close to the cylinder heads. Some Cayenne owners even broke the airbox struggling with this part of the job, don’t be like them.

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Now for the easy parts

Porsche Cayenne 5 air filters

via Michael Van Runkle / HotCars

With the plastic bolts out and the air compressor hose disconnected, simply unclip the metal retainers upwards, then lift the airbox part up, while pushing slightly towards the top. rear to release the intake bellows. Replace the new air filters or check if the old ones are dirty. Mine were quite dirty but not too terrible, but I still replaced them with an optional heavyweight set Mann filter units i bought because i plan to take this thing off road.

Reinstall everything in reverse order – don’t forget the air compressor hose – and the engine compartment job is done!

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The often overlooked cabin air filter

Porsche Cayenne 8 air filters

via Michael Van Runkle / HotCars

While even the most careless professional and home mechanics will eventually remember to replace engine air filters, many never bother to replace the cabin air filter. But this crucial filter helps keep the air conditioning system running smoothly, so taking a few minutes or so for this every time you do engine air filter work is probably a good idea to avoid potentially expensive repairs down the road.

I learned how crucial cabin air filters are over the past year or so when the air conditioning in an all-new Jeep Gladiator completely stopped working after a week of fighting forest fires in the Californian desert. My 1998 Mitsubishi Montero, on the other hand, doesn’t even have a replaceable cabin air filter, which is probably why it makes a terrible fan noise every time the air conditioning is turned on. For the Cayenne, open the glove box and locate a small screw just below. It should be a T20 Torx or Phillips screw, even though mine turned out to have nothing at all.

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Porsche Cayenne 9 air filters

via Michael Van Runkle / HotCars

The plastic panel under the glove box then opens downward with metal clips that hold it in place. One of my clips was also broken, so the panel was only held by a single metal clip – I will at least replace the missing screw, but the fact that my Cayenne’s panel doesn’t sag at all shows that all three fasteners are probably a bit overkill.

Gently lower the panel to avoid straining the electrical wires and revealing the cabin air filter housing. Use the 8 millimeter socket to remove the two screws.

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Probably the original cabin air filter

Porsche Cayenne 10 air filters

via Michael Van Runkle / HotCars

As suspected, my cabin air filter was completely disgusting. I would recommend having a vacuum on hand and plenty of paper towels if you think it’s been a while since nobody got in there. I wiped everything down, including as high as possible in the housing, before installing the new filter. Pay attention to the direction of the air flow (the Mann Filter came with instructions, something I’ve never seen for a cabin air filter before).

Reinstall the case cover and screws, put the panel under the dash back in place, and replace this last screw (if you have one). And that’s all the job – the engine part took about an hour and should take less next time, but just doing the cabin air filter could take as little as five minutes.

My Cayenne’s air conditioning and heater vents now circulate much easier and faster, although the system seemed a bit muddled at first. Hopefully the new cabin air filter will help remove the dust and sand that has settled in the truck despite my repeated cleaning efforts. And (just like, if not more), hopefully the engine and air compressor will feel a little happier now with the engine’s two new air filters.

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