If you own a 2006 Porsche Boxster (model code 987) and need to replace part number 987 111 353 00, getting the correct dimensions is critical for a proper fit. This part, commonly known as the coolant hose or water pipe, connects the engine block to the heating system. Many online searches misspell "dimension" as "dimmension," but this guide provides accurate measurements and practical advice to help you complete the repair confidently.
What Is Part 987 111 353 00?
Part 987 111 353 00 is a molded rubber hose used in the cooling system of 2005–2008 Porsche Boxster (987) and Cayman (987) models. It carries coolant from the rear of the engine to the cabin heater core. Over time, the rubber can crack or leak, requiring replacement. The part is located in the engine compartment, near the firewall on the passenger side (left side in left-hand-drive cars).
Dimensions of the Hose
The hose has a specific length and internal diameter to fit precisely between rigid fittings. Here are the standard measurements:
- Length: 200 mm (7.87 inches) from end to end
- Inner diameter: 25 mm (0.98 inches) at both ends
- Outer diameter: approximately 32 mm (1.26 inches)
- Wall thickness: about 3.5 mm (0.14 inches)
These dimensions ensure a snug fit onto the 25 mm metal pipes. The hose also has a slight curve to route around the engine compartment. Using a hose with different dimensions could cause leaks or kinking.
Why Correct Dimensions Matter
Installing a hose with the wrong length or diameter can lead to:
- Leaks: If the inner diameter is too large, the clamp won't seal; if too small, the hose may not fit over the fitting.
- Kinking: A hose that is too long may bend sharply, restricting coolant flow and causing engine overheating.
- Fitment issues: The molded shape must match the original to avoid rubbing against other components.
Always verify dimensions before purchasing. Even new genuine Porsche parts sometimes vary slightly—measure your old hose against the specifications above.
How to Verify Your Part
Before ordering replacement part 987 111 353 00 for your 2006 Boxster, check the existing hose for:
- Part number: Look for a molded-in number on the hose itself. It may read "987 111 353 00" or "1.987.111.353.00." If the number is different, you may need a different hose.
- Visual condition: Cracks, bulges, or coolant residue indicate failure.
- Measurements: Use a ruler or caliper to confirm length and inner diameter. Compare with the dimensions above.
Cross-Reference and Alternatives
Some aftermarket suppliers sell hoses under interchangeable part numbers. Common equivalents include:
- OEM: 987 111 353 00
- Aftermarket: Febi 42189, Meyle 014 048, or ContiTech allied brands.
These aftermarket hoses should match the same dimensions. However, quality can vary—aftermarket rubber may be less flexible or durable than Genuine Porsche parts. Read product descriptions carefully for dimensional specs.
Step-by-Step Replacement Guidance
Replacing the hose is a moderate DIY task. Here's a general outline:
- Allow the engine to cool completely. Coolant is hot and pressurized.
- Drain the cooling system via the radiator drain plug (passenger side). Catch at least 2 liters.
- Access the hose: Remove the engine cover and, if necessary, the air cleaner housing.
- Remove hose clamps using pliers or a screwdriver. There are two spring clamps securing each end.
- Pull the old hose off the metal pipes. Twist gently if stuck.
- Install the new hose by pushing it onto the pipes until fully seated. Ensure the hose is oriented correctly—the natural curve should not be stressed.
- Reinstall clamps in their original positions.
- Refill coolant with Porsche-approved fluid (typically G12 or equivalent). Bleed air using the bleeder screw on the thermostat housing.
- Check for leaks after running the engine to operating temperature.
Tools You'll Need
- Flathead screwdriver or pliers for clamps
- 6mm Allen key (for drain plug)
- Coolant collection drain pan
- New coolant (Porsche pink or purple approved)
- Ruler or caliper to verify dimensions
Common Mistakes to Avoid
- Using a universal straight hose: The molded shape is essential; a straight hose will kink.
- Over-tightening clamps: This can cut into the rubber and cause leaks later.
- Ignoring old coolant condition: If the old coolant is dirty, consider flushing the entire system.
- Forgetting the o-rings: Some hoses come with new o-rings for the pipe connectors; if not, reuse carefully.
Final Recommendation
For a 2006 Porsche Boxster, use only a hose that meets the exact dimensions of 987 111 353 00: 200 mm length and 25 mm inner diameter. Genuine Porsche parts are preferred for longevity and perfect fit, but reputable aftermarket brands like Febi or Meyle can be cost-effective if they match those specs. Always measure your original part and compare with the new one before final installation. Replacing a coolant hose early can prevent overheating and expensive engine damage. If you are unsure about the fit or the repair, consult a qualified Porsche mechanic.