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Porsche 997 Water Damage Fix Guide: Drain Maintenance & BCM Protection
If you own a Porsche 911 (997), Boxster (987), or Cayman (987), you need to be aware of one silent killer that causes serious electrical problems: water intrusion. The most common victim? Your Rear Body Control Module (BCM).
In this guide, we’ll show you:
- How water damages your Porsche electronics
- Where the drains are located and how to clean them
- What signs point to BCM damage
- The smartest way to fix a water-damaged rear BCM
📄 Why Water Damage Happens in Porsche 997 & 987 Models
The Porsche 997 and 987 platforms have drain systems under the cowl, sunroof, and convertible top. Over time, these drains clog with leaves, dirt, and debris. Once blocked, rainwater and condensation begin to overflow—right into your car’s cabin.
The Rear BCM, located under the driver’s seat or behind rear panels, sits low in the chassis. As water enters, it pools in the floor area, soaking wiring and control modules like the BCM. Even light moisture can cause corrosion or internal short circuits.
⚠️ Signs Your Porsche Has Drain or Water Intrusion Issues
- Wet carpet under driver’s seat
- Musty interior smell
- Random electrical issues
- Intermittent or failing power windows
- Rear spoiler or trunk not working
- Battery drain or electrical glitches
If you’ve noticed any of these issues and live in a wet climate or park outside, your drains are likely clogged.
🔧 How to Clean Your Porsche Cowl and Sunroof Drains
Tools you’ll need:
- Small flexible cable or weed trimmer line
- Vacuum or compressed air
- Water source for testing
Steps to clean the drains:
- Open the front hood (frunk) and remove the cowl cover at the base of the windshield.
- Locate the rubber drain tubes on both driver and passenger sides.
- Use the cable or line to snake through each tube and clear any blockages.
- Use vacuum or compressed air to blow out dirt and debris.
- Pour a small amount of water into the drain area to ensure it flows out the bottom of the car.
- Repeat the process for rear drains if your car is a convertible.
Do this at least once a year or after heavy fall seasons.
🚀 Protecting and Fixing Your BCM the Smart Way
If your BCM is already showing failure symptoms due to water exposure, don’t panic. You don’t need to buy a new one or go to the dealership for expensive reprogramming.
We offer a Rear BCM Clone Service that includes:
- Cloning all original VIN, immobilizer, and coding data
- Making a donor BCM plug-and-play
- No dealer tools required after install
Ship your original and donor module to Karman Auto, labeled clearly as “Original” and “Donor.”
📈 Don’t Let Clogged Drains Destroy Your Porsche
A few minutes of maintenance can save you thousands in repairs. And if your BCM has already suffered damage, we’re here to help.
🔗 Order Our Porsche Rear BCM Clone Service Now
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