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          Genuine BMW 11537502525 - Engine Coolant Bypass Pipe

          MPN: 11537502525
          The Genuine BMW 11537502525 Engine Coolant Bypass Pipe ensures efficient coolant flow, preventing engine overheating. Designed for seamless installation and reliable performance.
          0.0
          Vehicle Specific
          Check if this part fits your vehicle.
          • $78.65
          In stock

          Product Overview

          The Genuine BMW Engine Coolant Bypass Pipe (MPN: 11537502525) is a critical component designed to maintain optimal engine temperature in a variety of BMW models. This high-quality coolant pipe connects the water pump outlet to the lower radiator hose, ensuring a reliable flow of coolant throughout your vehicle's cooling system. Manufactured to OEM standards, it includes an O-ring for secure installation, making it an essential choice for both DIY enthusiasts and professional technicians. Choose Genuine BMW 11537502525 for dependable performance and peace of mind every time you service your vehicle.

          Cross Reference Numbers

          This Genuine BMW 11537502525 is equivalent to or replaces the following part numbers: 11 53 7 502 525, 11537502525.

          Vehicle Compatibility

          • BMW 325Ci 2.5 L6 (2001–2006)
          • BMW 325i 2.5 L6 (2001–2005)
          • BMW 330Ci 3.0 L6 (2001–2006)
          • BMW 330i 3.0 L6 (2001–2004)
          • BMW Z4 2.5i (2005)
          • BMW Z4 3.0i (2005)
          • BMW 530i 3.0 L6 (2003)
          • BMW Z3 Coupe 3.0 L6 (2000–2002)
          • BMW Z3 Roadster 3.0 L6 (2000–2002)
          • BMW 323Ci 2.5 L6 (2000)

          This may also fit other applications. Please use the vehicle selector tool to verify fitment.

          Why Shop at eEuroparts.com?

          • Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
          • Exclusive Kits That Fit™ - complete repair solutions with no guesswork.
          • Fitment Confidence: Our accurate cataloging ensures you get the right part the first time.
          • Fast, Reliable Shipping: Orders ship quickly from our U.S.-based warehouses.
          • Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
          • Established Trust: Serving the European auto community since 2000.

          Frequently Asked Questions

          What does the Genuine BMW 11537502525 Engine Coolant Bypass Pipe do?

          The Genuine BMW Engine Coolant Bypass Pipe facilitates the flow of coolant from the water pump to the lower radiator hose, playing a crucial role in regulating engine temperature and preventing overheating.

          How do I know if my Engine Coolant Bypass Pipe needs replacement?

          Common signs indicating potential failure of the coolant pipe may include coolant leaks, engine overheating, and fluctuating temperature readings on your dashboard.

          Can I install the Genuine BMW 11537502525 myself?

          Yes, you can install the Genuine BMW Engine Coolant Bypass Pipe yourself if you have basic mechanical knowledge. However, ensure you follow proper safety precautions and consult the vehicle's service manual for guidance.

          What are the symptoms of a faulty Engine Coolant Bypass Pipe?

          Symptoms of a failing coolant pipe may include coolant leaks, engine overheating, and inconsistent temperature readings. If you experience such issues, it is advisable to inspect the coolant system promptly.

          Why should I choose Genuine BMW for my Engine Coolant Bypass Pipe needs?

          Genuine BMW parts are designed for optimal performance and reliability. Order Genuine BMW 11537502525 today for a factory-correct replacement that restores safety and performance.

          Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.

            • eEuroparts SKU
              948361
            • Weight
              0.46 lbs
            • Dimensions (L x W x H)
              14.7298 x 2.4825 x 5.8863 in
            • Manufacturer Part #
              11537502525
          • Brand
            Genuine BMW
          • Manufacturer
            Genuine BMW
          • MPN
            11537502525
          • Part Type
            Engine Coolant Bypass Pipe
          • OE Part Numbers
            11 53 7 502 525, 11537502525
          • Fitment
            • Fitment Type
              Vehicle Specific
          YearMakeModelSubmodelNotes
          1999BMW323iBase (2.5 L6 GAS)Notes: Water pipe
          1999BMWZ3Roadster (2.5 L6 GAS)Notes: 2.5 LITER
          1999BMWZ3Coupe (2.8 L6 GAS)Notes: 2.8 & 3.0 LITER 1999-02
          1999BMWZ3Roadster (2.8 L6 GAS)Notes: 2.8 & 3.0 LITER 1999-02
          1999BMW528iBase (2.8 L6 GAS)Notes: 525I,528I & 530I 1999-03, engine inlet
          1999BMW328iBase (2.8 L6 GAS)Notes: Water pipe
          2003BMW325iBase (2.5 L6 GAS)Notes: 2WD
          2003BMW330CiBase (3.0 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2003BMW530iBase (3.0 L6 GAS)Notes: 525I,528I & 530I 1999-03, engine inlet
          2003BMW325CiBase (2.5 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2003BMWZ42.5i (2.5 L6 GAS)Notes: 2.5, 3.0 LITER 2003-05, Outlet pipe
          2003BMWZ43.0i (3.0 L6 GAS)Notes: 2.5, 3.0 LITER 2003-05, Outlet pipe
          2003BMW330iBase (3.0 L6 GAS)Notes: 2WD
          2002BMW330iBase (3.0 L6 GAS)Notes: 2WD
          2002BMWZ3Roadster (2.5 L6 GAS)Notes: 2.5 LITER
          2002BMWZ3Coupe (3.0 L6 GAS)Notes: 2.8 & 3.0 LITER 1999-02
          2002BMWZ3Roadster (3.0 L6 GAS)Notes: 2.8 & 3.0 LITER 1999-02
          2002BMW325iBase (2.5 L6 GAS)Notes: 2WD
          2002BMW330CiBase (3.0 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2002BMW325CiBase (2.5 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2002BMW530iBase (3.0 L6 GAS)Notes: 525I,528I & 530I 1999-03, engine inlet
          2001BMWZ3Roadster (2.5 L6 GAS)Notes: 2.5 LITER
          2001BMWZ3Coupe (3.0 L6 GAS)Notes: 2.8 & 3.0 LITER 1999-02
          2001BMWZ3Roadster (3.0 L6 GAS)Notes: 2.8 & 3.0 LITER 1999-02
          2001BMW325CiBase (2.5 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2001BMW325iBase (2.5 L6 GAS)Notes: 2WD
          2001BMW330CiBase (3.0 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2001BMW330iBase (3.0 L6 GAS)Notes: 2WD
          2001BMW530iBase (3.0 L6 GAS)Notes: 525I,528I & 530I 1999-03, engine inlet
          2005BMW325CiBase (2.5 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2005BMW325iBase (2.5 L6 GAS)Notes: 2WD
          2005BMW330CiBase (3.0 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2005BMW330iBase (3.0 L6 GAS)Notes: 2WD
          2005BMWZ43.0i (3.0 L6 GAS)Notes: 2.5, 3.0 LITER 2003-05, Outlet pipe
          2005BMWZ42.5i (2.5 L6 GAS)Notes: 2.5, 3.0 LITER 2003-05, Outlet pipe
          2000BMW323iBase (2.5 L6 GAS)Notes: Water pipe
          2000BMW323CiBase (2.5 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2000BMWZ3Coupe (2.8 L6 GAS)Notes: 2.8 & 3.0 LITER 1999-02
          2000BMWZ3Roadster (2.8 L6 GAS)Notes: 2.8 & 3.0 LITER 1999-02
          2000BMWZ3Roadster (2.5 L6 GAS)Notes: 2.5 LITER
          2000BMW328CiBase (2.8 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2000BMW328iBase (2.8 L6 GAS)Notes: Water pipe
          2000BMW528iBase (2.8 L6 GAS)Notes: 525I,528I & 530I 1999-03, engine inlet
          2004BMW325CiBase (2.5 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2004BMW325iBase (2.5 L6 GAS)Notes: 2WD
          2004BMW330CiBase (3.0 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2004BMW330iBase (3.0 L6 GAS)Notes: 2WD
          2004BMWZ42.5i (2.5 L6 GAS)Notes: 2.5, 3.0 LITER 2003-05, Outlet pipe
          2004BMWZ43.0i (3.0 L6 GAS)Notes: 2.5, 3.0 LITER 2003-05, Outlet pipe
          2006BMW330CiBase (3.0 L6 GAS)Notes: 325CI & 330CI, Water pipe
          2006BMW325CiBase (2.5 L6 GAS)Notes: 325CI & 330CI, Water pipe
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          Warranty Overview

          At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.

          Standard Warranty – Most Parts

          • Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.

          • Protection: Defects in materials or workmanship under normal personal use.

          • Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.

          • Exclusions:

            • Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)

            • Commercial, fleet, rideshare, off-road, or racing use

            • Improper installation, misuse, accidents, or modifications

          • Not Covered: Labor, shipping, towing, or incidental costs.

          Bison Performance Warranty – Our House Brand

          • Coverage: Limited Lifetime Warranty for as long as you own your vehicle.

          • Applies To: All products sold under the Bison Performance label.

          • Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.

          • Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).

          • What’s Included: Replacement of the defective product (labor and shipping excluded).

          Warranty Claim Requirements

          To keep claims fast and fair, we require:

          • Proof of purchase (invoice or order confirmation).

          • Photos or videos showing the defective part, order number, date, VIN, and odometer reading.

          • Diagnostic reports or part returns for non-visible issues may be requested.

          • Claims must be truthful, properly documented, and reflect normal consumer use.

          Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.

          For full details and exclusions, please see our complete Warranty Terms & Conditions.

          This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.

          Return Policy Overview

          Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
          To start a return, contact customer support via Chat or Contact Us.

          • Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)

          • Refunds: Issued to your original payment method within 3–5 business days after inspection

          • Exchanges: Not automatic — please return and reorder

          • Replacements: May be approved for incorrect or defective items reported within 7 days

          Not returnable:

          • Used or installed parts

          • Electrical components

          • Opened filter kits, gaskets, or contaminated items

          • Final sale or custom orders

          Important Notes:

          • Return shipping is your responsibility unless we made a verified error

          • Fitment is the customer’s responsibility (we can assist, but do not guarantee)

          • Country of origin may vary and is not grounds for return

          For complete details, please see our full Return Policy.


          This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.

          Fast, Reliable Shipping — Straight to Your Door

          We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.

          • We use trusted carriers like UPS, FedEx, and USPS.

          • Tracking info is emailed to you as soon as your order ships.

          • Delivery estimates at checkout are based on carrier data, but not guaranteed.

          Need help with a shipment?

          If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.

          For complete details, please see our full Shipping Policy.


          This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.

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