BMW F30 330i & 340i Coolant Hose-Heater Hose to Transmission Oil Cooler OEM 17128673993

This BMW F30 340i coolant hose (heater hose to transmission oil cooler) helps support proper cooling performance across critical engine and transmission systems. It connects the heater hose circuit to the transmission oil cooler, helping maintain stable fluid temperatures for smoother operation.

Over time, aging rubber, heat exposure, and pressure cycles can cause coolant hose deterioration. When the coolant hose becomes cracked, swollen, or brittle, it may leak or lose flow efficiency. Replacing a failing coolant hose can help you prevent coolant loss, reduce overheating risk, and restore reliable heat management.

Installing the correct OEM-style part for your BMW F30 340i supports a proper fit and consistent routing. That matters because hose placement affects seal integrity and helps protect nearby components from abrasion or stress points. If you notice dampness around hose connections, performance changes during warm-up, or warning lights related to cooling, this transmission oil cooler hose connection is a smart repair step.

Key benefits of replacing your leaking or worn BMW heater-to-transmission coolant hose include:

1. Improves coolant system reliability by restoring secure sealing between the heater hose and transmission oil cooler.
2. Helps prevent coolant leaks that can lead to low coolant levels and increased overheating risk.
3. Supports consistent temperature control to promote smooth drivetrain operation.
4. Replaces brittle or damaged hose materials that may fail under heat and pressure.

This coolant hose/heater hose connection is an OEM replacement option referenced as 17128673993. If you drive a BMW F30 340i, this is the type of part you want when you’re troubleshooting cooling issues, addressing fluid leaks, or maintaining long-term system performance.