If you got wet carpets
You hear water sloshing around in the car
A pillars are wet
Signs of moisture on the A Pillars
You get AWD disabled message on the DIM
I your trusty dealership said you need a YAW RATE sensor
If you have any of these signs than there is a good chance you need to clean out your sunroof drains. This is an important guide for you new XC90 owners. A simple 30 minute fix can literally save you thousands and many headaches. I do it every few months now.
In the image below you can see the handle that is on the front windshield pillar. Typically this part of the vehicle is called A Pillar. The area highlighted darker is where you would insert the smallest flat blade screw driver you own. To protect the trim, put two thin pieces of tape on each side of the screw driver.
Once the cover is popped off, you will find two 10mm bolts, un-do them to remove the pillar handle. These two bolts are all that holds the handle. Now look towards the top edge next to the headliner, you will see the black door moulding. Pull back some of this moulding as it will make this entire process easier. Next, stick your finders in and get a good grip on the pillar and pull it towards the inside of the car. Once it is off you will see what use to a clear tube that is now a murky clear brown color. Follow this tube down the edge of the windshield to the end like in the next picture
The above picture shows it pulled out of the frame of the car. its ok, you need to clean this out. in the next picture is how the plastic tip looks like. it goes from a 3/4" diameter tube to small nothing. as you can see in the left, my tube is "clear brownish" color too.
In the image shown below, you can see what fell out of this tube after only being out side for three months. That should give you some idea of how important this process is to preform on a regular basis.
As an additional step I made slits in my rubber grommit, like this. The idea is to enlarge the choke point where debris usually collects and backs up. This simple trick could save you a lot of money in the long run.
Your plastic tube hose might come off the rubber grommit, thats ok. It doesn't need to be on tight. It only needs to be on to direct the flow of water out of your vehicle. To check the fruits of your labor after you re-assembled everything and before you put back the pillar, get some water and pour it down the two little holes in the front left and front right corners of the sunroof to see the water run down the drain and out the car. When you do this, make sure the vehicle is either on level ground or pointed down hill.
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