
The sunroof drain outlets on the Vision are located at the four corners of the sunroof. They are easily visible when the sunroof is opened, appearing as four small holes, each connected to a hose that leads to the front and rear of the vehicle. Consequences of a clogged sunroof drain outlet: If the sunroof drain hole becomes blocked, water can accumulate and flow along the roof towards the sunroof motor inside the vehicle. When powered on, this can cause the sunroof motor to short-circuit or even burn out. Methods for cleaning the drain outlet: Initial blockages usually occur at the entrance of the drain hole, which is easily visible and accessible when the sunroof is opened, making it simple to clean by yourself. Over time, debris may travel further into the drain hose, making it more difficult to clear. In such cases, it is advisable to seek professional assistance for unclogging.

About those sunroof drain outlets, I actually got hands-on experience when cleaning my Vision last time. There are tubes hidden in all four corners – the front two run down along the A-pillars. Just lift the hood and peek under the edge trims to spot them. The rear ones are more sneaky, requiring you to pry open the side trunk panels to locate them. Eventually, the water squirts out near the rear wheel liners. Those tiny plastic nozzles clog ridiculously easily – I once unclogged one using a bicycle brake cable. Pro tip: pinch the base of the rubber hose while poking to avoid dislodging it, or you might end up dismantling the headliner... now that’s a real headache.

As a veteran Vision owner, I've gained quite some experience in locating drain holes. Stand at the front of the car and look towards both sides of the windshield - you'll find the front drain outlets hidden beneath the A-pillars. For the rear ones, you'll need to crouch down and check the inner side of the rear wheel arches. After experiencing floor water accumulation following a heavy rain, I truly understood the importance of regular maintenance. Now, every quarter I use a syringe to pour water into the sunroof tracks to test drainage speed. If it's slow, I immediately use a bubble tea straw to poke the drain nozzles - this saves me the unnecessary expense of dismantling the interior trim.

A mechanic friend taught me a trick: just keep a plastic hose for the AC drain pipe. For the front drain, lift the wiper cover and insert the hose, running it down about half a meter from the A-pillar. For the rear drain, remove the taillight trim and extend the hose toward the rear bumper. The key is the small duckbill valve hidden inside the rear wheel arch—if it gets clogged with mud, water will backflow. Simply squeeze the valve body and wiggle it left and right to clear it. This method is much safer than forcefully poking.

Just helped my neighbor unclog the Vision's sunroof drain tube yesterday. The actual test showed the drain outlet is hidden in the gaps of the chassis guard plate. Peeling back the front wheel fender reveals a 5mm black rubber tip, while the rear one is concealed at the fold of the inner liner. The key is using flexible electrical wire to gently clear it - when encountering resistance, just twist your wrist. Remember to pour water after cleaning to test flow rate; it should drain completely within three seconds to pass. Otherwise, you'll be crying over a flooded dashboard during rainy season.

The essence of sunroof from the workshop master: The drainage hoses at the four corners all hang down to the bottom of the car, with the outlets about 20cm above the ground. For daily maintenance, don't just clear the outlets; backflush from the sunroof track water inlet and use a vacuum cleaner to remove dust from the leaf veins in the track corners. I make it a habit to attach dust-proof nets to the water outlets before the rainy season, and now it hasn't clogged for three years. By the way, the front drainage pipe is 1.8 meters long, and the rear one is 2.2 meters. Replacing the pipes requires removing the B-pillar trim panels—this is money you really can't save on.


