Rein CHK0008P Radiator Coolant Hose Kit - Lower - Radiator To Thermostat

OE-Style Lower Radiator Hose Kit

Rein CHK0008P is an OE quality radiator coolant hose kit for European cooling systems that require a direct-fit lower hose from the radiator to the thermostat. It is built for BMW applications and follows the original hose shape, branch layout, and quick-connect design for a clean replacement on service jobs.

For BMW 540i, BMW 740i, BMW 740iL, and BMW Z8 applications, CHK0008P includes a preinstalled temperature sensor to reduce repeat repairs tied to reused sensors and connectors.

Key Features

• Direct replacement for OE radiator coolant hose assemblies
• Preinstalled temperature sensor helps reduce comebacks from reused sensors
• Application-specific fit with no cutting, refitting, or adjusting
• Thermoplastic quick-connect fittings match the original connection style
• EPDM hose construction resists heat, salt, road debris, oil, and contaminants
• Built to SAE J20R4 -D1 standards
• Compatible with BMW lower radiator to thermostat routing

Detailed Description

Rein CHK0008P is a radiator coolant hose kit engineered as a direct OE-style replacement for European vehicles. The hose follows the original routing and dimensions, including the branch geometry and quick-connect interfaces, so it installs like the factory part rather than a universal hose. This makes it a practical choice for BMW cooling system repairs where correct fit and sensor integration matter.

This part cross-references BMW 11531711322 and 11537503725 for the same application. It is a strong match for BMW 540i lower radiator to thermostat service, BMW 740i lower radiator to thermostat service, BMW 740iL lower radiator to thermostat service, and BMW Z8 lower radiator to thermostat service. CHK0008P is also listed for BMW 540i, BMW 740i, and BMW 740iL models with the noted temperature switch and quick connector configuration.

What It Helps Address

• Coolant leaks at aged hose connections
• Repeat failures from reused quick connectors and O-rings
• Sensor-related comebacks after hose replacement
• Fitment issues caused by trimming or adapting a universal hose
• Heat and contamination damage in the cooling circuit

Installation Notes and Tips

Install CHK0008P as a direct replacement on the lower radiator to thermostat hose path. Verify the vehicle build date and application notes before installation, especially for 1999 BMW 540i, 740i, and 740iL models built from 9/98. The preinstalled temperature sensor reduces handling steps during service, and the OE-style quick connectors support a factory-like connection at the radiator and thermostat ends.

• Fits 1999 BMW 540i, Lower - Radiator To Thermostat, from 9/98, incl. temp. switch, w/ quick connectors
• Fits 2000-2003 BMW 540i, Lower - Radiator To Thermostat, includes temperature switch and quick connectors
• Fits 1999 BMW 740i, Lower - Radiator To Thermostat, from 9/98, incl. temp. switch, w/ quick connectors
• Fits 1999-2001 BMW 740i, Lower - Radiator To Thermostat, includes temperature switch and quick connectors
• Fits 1999 BMW 740iL, Lower - Radiator To Thermostat, from 9/98, incl. temp. switch, w/ quick connectors
• Fits 2000-2001 BMW 740iL, Lower - Radiator To Thermostat, includes temperature switch and quick connectors
• Fits 2003 BMW Z8, Lower - Radiator To Thermostat, includes temperature switch and quick connectors

Quality Assurance

Rein builds this hose kit as an OE quality replacement for European vehicles, with the temperature sensor preinstalled to help avoid reuse-related failures. The hose construction uses EPDM material and thermoplastic quick-connect fittings to match the original design and support consistent cooling system service on BMW applications.