Where is the sunroof drain pipe of the Envision?
3 Answers
Envision's sunroof drain holes are located near the sunroof sliding tracks and can be seen when the sunroof is fully opened. Below is a partial introduction to the drain holes: 1. If the sunroof leaks, check whether the drain holes are clogged with dust; there are no special requirements for the daily maintenance of the car sunroof, just regularly check whether the sealing strips around the sunroof are damaged and inspect the lubrication condition of the tracks. 2. In addition, there are air conditioning drain holes, engine compartment drain holes, door drain holes, fuel tank drain holes, and exhaust pipe drain holes on the car. 3. The air conditioning drain hole is designed to drain the water droplets generated during the use of the air conditioning system.
I've fixed quite a few Envision sunroof leaks, with the drain tubes typically hidden in the four corners. The front drain tubes are the most frequently used, running from the front corners of the sunroof above your head into the A-pillars, then down along the plastic trim above the doors to the front wheel fenders. The rear drain tubes extend from the rear corners into the C-pillars, eventually emerging near the rear bumper. The tube ends are fitted with duckbill-shaped rubber grommets to keep insects out, but Buick's design has a common flaw—the tubes tend to detach at the connections or the joints deteriorate. Two years ago, while helping a neighbor, I found his front drain tube had come loose when we removed the A-pillar trim. Reattaching it and wrapping it tightly with waterproof tape fixed the leak.
The quickest way to locate the drain pipe is to check under the chassis! Last time, my car's front passenger floor mat suddenly got flooded. I crawled behind the right front wheel and felt along the inner side of the fender liner—sure enough, I found a finger-thick soft rubber hose. The drain outlet is hidden in the gap between the fender liner and the car body, requiring some trim to be pulled back for visibility. Now during the rainy season, I inspect this outlet every month—last time, I cleared out a handful of mud and sand. If you notice water dripping near the wheels without the AC running, chances are the drain is clogged. A heads-up: Be careful when using thin wire to unclog the pipe—the OEM Buick hose is thinner than aftermarket ones, and puncturing it would cause bigger trouble.
