Car Water Leak Repair & Sunroof Leak Repair

Mac's is the automotive water leak finder! We determine where the water leak is, what damage it caused, and how to fix it. Call Mac's if you have a car water leak, a sunroof leak, a trunk leak or your convertible top leaks. We'll find the leak and fix the leak.

90 day warranty

Book Your Appointment Now

Our popular water leak repair service is back! Call 206-783-1696 to schedule your appointment. Our appointment calendar fills up fast, so don't wait. All water leak repairs are guaranteed for 90 days. Please note our warranty does not apply to any subsequent leaks unrelated to the original repair.


Diagnose & Repair Car Water Leak

water leak dripThorough diagnosis is the first step in successful car leak repair. You can't take half measures because water doesn't always collect near the source of a leak. For example, poor roof drainage or clogged sunroof lines are often responsible for water in the trunk. Diagnosis is a lot more complicated that spraying water on your car.

Before the testing begins, we disassemble the interior and dry the affected area. The shakedown phase may include removing seats, carpeting, padding, firewall insulation, wiring & relays, gloveboxes, interior trim, computers, amplifiers, etc.

Automotive Water Leak Repair

Once we've identified the source of a leak, we consult with the customer. If they green-light the repair, we fix the leak, retest the car, then disinfect and reassemble the interior. Repairing a water leak the correct way is a time-consuming process often requiring two to three days.

Did you know that: 1) Most Seattle area repair shops recommend Mac's Upholstery for water leak detection and repair, 2) Your comprehensive auto insurance policy often covers damage caused by a water leak, 3) Our technicians will temporarily patch your convertible top for free when you order a replacement top.

  • testing for water leak
    Testing For Sunroof Leak
  • clogged sunroof
    Sunroof Debris Clogs Drainage Lines
  • clogged drainhole
    Drainage Lines Cleared
    Sunroof Checklist
  • Sunroof Seal to Roof
  • Sunroof Seal to Glass
  • Obstructed Drains
  • Damaged Drain Hoses
  • Inoperable Sunroof Panel
  • Sunroof Track Assembly Damaged
    Trunk Checklist
  • Trunk Seal
  • Body Seams
  • Damaged Tailgate Assembly
  • Damaged Seal to Body
  • Rear or Side Windows
  • Antenna
  • License Plate
  • License Plate Lights
  • Key Lock Assembly
  • Spoilers
  • Leaking Third Brake Light
    Body Checklist
  • Windshield
  • Side Windows
  • Rear Glass
  • Body Seams
  • Door Seams
  • Access Boots
  • Door Shields
  • Fresh Air Vents
  • Electrical Connections
  • Leaking Firewall
  • Rust
  • Speedometer, Throttle Cables
  • Luggage Racks

If left untreated, a car water leak, leaking sunroof, taillight leak, leaking trunk or leaking convertible top can cause thousands of dollars in damage. Standing water rusts floor boards, electrical components and door mechanisms.

And it's not just older vehicles. Any automobile can develop a body or trunk leak. Weather stripping, window seals, sunroof seals, firewall components and gaskets wear out. Even a minor fender bender can knock things out of alignment and trigger a leak.

Dangerous Mold & Mildew

Water leaks can also be bad for your health by promoting growth of dangerous mold and mildew. Left untreated, mold and mildew can spread. The pictures below illustrate how mold that sprouted in the carpet of a car leaking water eventually spread to the seats and underneath the headliner.

mold growing in car
Mold Growing In Carpet
mold growing in car
Mold Growing Under Headliner

Patch Vandalized Top

When you file an insurance claim for a top that's been vandalized or when you order a new top from Mac's Upholstery, we'll temporarily patch your leaking convertible top free of charge. The patch is not designed to last forever, but it's much more than a strip of duct tape. Our technicians take time to sew and seal the damaged area.


Hazardous Pine Needles

A couple of pine needles in your open sunroof may not seem like a big deal, but beware. A stray pine needle here and a twig sliver there — pretty soon you've got a pile of debris wedged inside your drainage conduit. If your drainage conduit is plugged, rainwater backs up into your trunk or passenger compartment.

  • plugged car drain
    Sunroof Leak Repair
  • plugged car drain
    Sunroof Drains Clogged

The same thing applies to convertibles. Check out the pile of debris (above) we found when installing a new convertible top. The drainage lines in this Miata were half-plugged with pine needles. We found the mess just in time. Another few months and the car would have sprung a leak.

Botched Installation Caused Leak

Car stereo shops promise flawless installations. But, every once in a while some nitwit screws up an installation by drilling holes in the wrong place. In this case, a misguided installer ran wires through a van's rear access panel causing a water leak. The shop tried to repair the leak with a spot of silicon caulk. It didn't work, so they tried another fix.

  • damaged access panel
    Attempted Caulk Repair
  • damaged access panel
    Hole Causing Water Leak
  • broken screw
    Broken Bracket

Long story short, the second repair attempt caused even more damage: a cracked seal and a broken bracket. By the time the leaking van arrived at Mac's, the owner was fed-up. Fortunately, we were able to permanently fix the leak by "repairing the repairs", then properly sealing the damaged access panel.

Hide & Seek With Water

After a few days in the garage, the carpet in this leaking Land Rover LR3 appeared bone dry. But, appearances can be deceiving. When we inspected the interior we discovered the padding beneath the carpet was still soaked. And that wasn't the worst of it. We found bundles of wire bobbing in about a quarter inch of water under the floor board.

  • land rover leak repair
    Land Rover LR3 Water Leak
  • land rover leak repair
    Padding Soaked With Water
  • land rover leak repair
    Auto Water Leak Repair

Repairing a leak is only half the job. Hunting for hidden pools of water and then thoroughly drying the interior is just as important. Trapped water is dangerous. It can do significant damage to a vehicle before it eventually evaporates.

2006 Eclipse Car Leak

You'd be surprised how often a parking lot fender bender results in a water leak. It doesn't take much force to nudge a door panel out of alignment. At first you might not notice the damage because a cracked seam can snap back after impact. But after a few months of road vibration the crack re-opens. Before you know it, rainwater is dripping down the wrong side of the windshield.

  • mitsubishi leak repair
    Trim Panel Fasteners Missing
  • mitsubishi leak repair
    Roof Door Joint
  • mitsubishi leak repair
    Cracked Seam

We suspect a minor accident spawned the water leak on the driver's side of this 2006 Eclipse. It's difficult to see, but there's a tiny crack where the "A" pillar is welded to the roof. It also appears that some trim fasteners have snapped off; further evidence of a fender bender.

Hyundia Accident Leak Repair

If a vehicle has been in a traffic accident, large sections of its body may be compromised. Even if a car looks good on the outside, a damaged vehicle may spring water leaks later.

The owners of this 2002 Hyundai Tiburon knew before buying the car that it had been damaged in an accident. It looked fine on the outside, but there were water leaks all over the place.

  • hyundai tiburon leak repair
    Hyundai Tiburon
  • resealing hyundai door
    Sealing Hyundai Door Frame
  • hyundai tiburon leak repair
    Resealing Tail Light

After running tests, we determined that the passenger side door, a roof seam and the right hand tail light all needed attention. Fortunately, the damaged sections were only slightly out of alignment. The sunroof was in good shape. After drying the interior of the vehicle, we removed the damaged seals and assemblies.

On projects such as this, identifying the source of the leak is usually the tricky part. Fixing the problem is relatively easy; apply a special sealant to the affected areas, then put everything back together. That did the trick.

Repair BMW Leak at ½ the Price

Repairing a BMW is notoriously expensive. A dealership would've charged the owner of this X3 roughly $2000 to fix the damage caused by an interior water leak.

They charge an arm and a leg because often times this sort of repair requires replacing the entire floor cover. Rather than replace everything, we limit repairs to the damaged section.

  • bmw
    Car Leaking Water
  • bmw
    Damaged Speaker & Water Conduit

This is a great example of how vulnerable modern cars are to water leaks. Electronics, computer components, and speakers are often located right next to conduits – in this case a red cleaning fluid hose (above right). Water from the leaking hose damaged the speaker.

  • bmw
    Drying Interior
  • bmw
    Car Leak Repair

The owner of this vehicle chose not to repair the speaker, so we diagnosed and repaired the leaking hose then sprayed the area with a special anti-fungal solution. After drying the interior, we custom-cut and installed sections of foam to replace the damaged ones, then refitted and attached the carpet. Our repair was effective and much less expensive than a dealer fix.

Car Water Leak Detectives

When is a trunk leak not a trunk leak?

The case of "The Phantom Trunk Leak" illustrates how tough it is to diagnose and fix an automotive water leak. The owner of this Volkswagen Jetta complained of a trunk leak. But, after repairing all the leaks in that section of the car, there was still water in the trunk.

  • trunk leak
    Replace Trunk Seal
  • sunroof leak
    Leaking Sunroof
  • sunroof drainage channel
    Sunroof Assembly Removed

We stripped the interior and spotted the problem; most of the water in the trunk was actually coming from the other end of the car. It turned out the drainage channels for the sunroof were clogged. Debris in those lines caused water to collect in the trunk area. We had to repair a sunroof leak and clear the drainage system. Along with a few other tweaks, that did the trick.

  • drainage tube leak
    Drain Line Under Headliner
  • drain tube nozzle
    Repaired Drainage Channel
  • trunk leak
    Sealing Nozzle & Drain Channel
  • sunroof leak
    Clamp & Seal Drain Valves
  • drainage tube leak
    Leaking "Flapper" Valve
  • trunk leak
    Enlarge Passenger Drain Valve

Often times we have to disassemble entire sections of a vehicle to identify the source of a water leak. What this customer thought was a simple trunk leak, turned out to be far more complicated and systemic. A do-it-yourself repair would have been a waste of time and money.