Dayco 78300GL Radiator Coolant Hose

Radiator Hose Overview

Dayco 78300GL is a straight radiator coolant hose for heavy-duty cooling system service. It is listed for multiple Freightliner, Western Star, and Peterbilt applications, with fitment notes that call for cut-to-fit installation on most listings.

Key Features

• Straight radiator coolant hose for heavy-duty cooling system routing
• Fits multiple commercial truck applications, including Freightliner M2 112 and 114SD, Western Star 4900SA and 6900XD, and Peterbilt 587
• Cut-to-fit notes on most applications for custom hose length matching
• Used in upper and lower cooling system connections, including radiator, pipe, and oil cooler routing
• Dayco part number 78300GL for catalog and service reference

Detailed Description

Dayco 78300GL is a straight radiator coolant hose built for heavy-duty cooling system layouts where a direct hose section is needed between pipes, radiators, coolers, or the engine. The fitment data covers 2011 Peterbilt 587, 2012-2014 Freightliner 114SD, 2016-2018 Western Star 4900SA and 6900XD, and 2017-2018 Freightliner M2 112, with several applications marked cut to fit. This makes it a practical service part for commercial truck cooling repairs that require a straight hose section rather than a formed bend.

The Dayco 78300GL part number is also useful when cross-checking service references. This part cross-references ACDelco 31116 and Gates 24848 for the same application.

What It Is Used For

• Replacing a damaged or deteriorated straight coolant hose section
• Restoring coolant flow between radiator, pipe, cooler, or engine connections
• Addressing leaks caused by cracking, hardening, or hose wear
• Matching custom-length cooling system routing where cut-to-fit service is specified

Installation Notes

Verify the exact vehicle, year, and hose routing before installation. Several listed applications require the hose to be cut to fit, so measure the required length carefully and confirm the connection points match the fitment notes. Use the vehicle-specific cooling system layout to confirm whether the hose routes to the radiator, pipe, oil cooler, or engine.

Quality Assurance

Dayco supplies cooling system components for service applications, and 78300GL is cataloged with direct fitment data for the listed commercial trucks. Confirm the part number 78300GL against the vehicle application before installation.