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Heating and Cooling› Water Pumps

BMW Genuine Parts

Coolant Return Hose

$40.83 $28.63 Save $12.20

SKU: 11537505831

In Stock
In Stock
Ships by Sep 9
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
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Easy — 1–2 hours

Overview

The BMW Genuine Parts 11537505831 is a coolant return hose designed for specific BMW Z3 models. This Genuine BMW part connects the expansion tank to the water pipe, carrying coolant to and from the expansion tank. If the hose shows signs of bulging or cracking, it should be replaced immediately to prevent failure.
Show original supplier description
The BMW Genuine Parts 11537505831 is an original BMW coolant return hose, also known as an engine coolant reservoir hose. This component is crucial for maintaining the proper coolant level in your vehicle's engine. It facilitates the transport of excess coolant to the reservoir when the engine is hot and allows it to return to the radiator as the engine cools, thereby preventing overheating and ensuring optimal operating temperature. This hose connects directly to the expansion tank and carries coolant back to it. It is essential to inspect this hose regularly for any signs of bulging or cracking, particularly at the ends. Such damage indicates a need for immediate replacement to avoid a potential system failure. For a complete cooling system refresh, replacement of this hose along with the expansion tank is recommended. This Genuine BMW part is manufactured in Germany and is guaranteed to be the same quality as the original part installed at the dealership. Symptoms of a failing coolant hose can include leaks, engine overheating, and the illumination of the check engine light due to issues with coolant temperature and level sensors. This coolant return hose is specifically designed for the BMW Z3 models from 1999 to 2002, including the 2.3, 2.5i, 2.8, 3.0L variants with M52, M52TU, M54, and S52 engines. It is compatible with both Coupe and Roadster body styles, across various transmission types (Manual/Automatic) and drivetrains (RWD).

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandBMW Genuine Parts
Part Number11537505831
CategoryHeating and Cooling

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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