Car washes problematic for vehicle sunroofs

Is there anything better than a sunny-day drive with the glass roof open? No wonder power sunroofs are such a popular option. And now instead of one glass panel, you can spring for the panoramic roof with glass that runs from almost one end to the other.

But there are a few drawbacks to these pseudo openair features that owners need to keep in mind. While glass roof panels are supposed to be watertight, certain events can overcome their sealing power — namely car washes. If you put on your reading glasses and peruse the fine print in your owner’s manual, for most vehicles you will find a disclaimer that states the maker will not be responsible for any leaks incurred in a car wash. (Most car wash facilities will have their own disclaimer signs as well).

The sheer volume and water pressure for most touchless car-washes will let water get past the seals and into the tray that surrounds the glass. Yes, that tray does have a water drain at each corner, but the tubes are narrow and can’t handle a lot of volume at once.

If you’re really stuck on using an automated car wash for your glass-roofed ride, consider a touch-type facility that uses less water volume and pressure or try a manual-style wash bay.

Those water drains should be checked once or twice a year to ensure they’re flowing freely. Small leaf pieces or pine needles can easily block them. All you have to do is gently pour a small amount of water in the tray when the roof is open and check for water flows at each corner. If you find a drain blocked, the safest way to try to clear it is a few gentle shots of compressed air.

If you don’t trust your trigger finger on an air compressor hose to deliver a gentle blast, use a can of compressed air sold by most electronic retailers.

The same car-wash cautions for sunroof-equipped vehicles apply to those with removable roof panels, such as Jeep Wranglers. They’re designed to keep most rain storm water out, but not full-pressure car washes.

And of course if you own a fully retractable soft-top convertible auto car-washes are out of the picture completely. The same can be said for hardtop convertibles, although if their seals are in good shape they may take the strain of a low-pressure touch-style wash.

As with any other weather-seal on a vehicle, a seasonal treatment on sunroof and folding-top seals with a silicone lubricating compound can extend their lifespan considerably. Found at all auto-parts stores, this type of product will reduce weather-cracking and tears by helping to keep the seals from sticking to metal surfaces.