Gates Coolant Hose

Gates Coolant Hose: Engineering the Leading Cause of Failure Out of the Equation

When an engine cooling system fails, the consequences rarely stay small. A ruptured or degraded coolant hose can escalate quickly into overheating, costly engine damage, and unexpected roadside breakdowns. That is exactly why Gates has invested so deeply in the science behind their coolant hose lineup — building products that directly address how and why hoses fail in the first place.

The Threat of Electrochemical Degradation

Most coolant hose failures trace back to a single culprit: electrochemical degradation, or ECD. When creating the FleetRunner™ Coolant Hose, Gates set out to tackle ECD — the process by which the hose, liquid coolant, and engine/radiator fittings form a galvanic cell or "battery," creating a chemical reaction that allows micro-cracks to form in the hose tube, through which coolant seeps and breaks down the reinforcement, ultimately leading to hose failure. Gates engineered their EPDM compound material with superior electrochemical resistance, so Gates coolant hoses last longer and keep engine systems running stronger.

A Comprehensive Product Lineup Built for Every Application

Gates offers one of the widest ranges of coolant hose options in the aftermarket, covering everything from standard passenger cars to heavy-duty commercial vehicles:

• Molded Coolant Hose: Manufactured to fit upper, lower, bypass, heater, and other coolant applications with OEM-quality specifications. Gates' curved hose line is the most comprehensive line on the replacement market. Each hose is pre-shaped to fit and ensure perfectly sealed conditions, with aramid or rayon knit reinforcement depending on the application.
• Silicone Molded Coolant Hose: Gates Silicone Molded Coolant Hose is built to surpass OE hose performance, sharing the same dimensional specifications as OEM hoses, with a silicone cover that resists high-temperature ambient environments and 3-ply polyester woven fabric reinforcement for high burst strength and superior service life. Temperature range extends from -54°C to +149°C (-65°F to +300°F).
• Modular Coolant Hose: Gates is the automotive aftermarket leader in the modular assembly coolant hose segment, manufacturing these hoses to fit specific applications similar to OEM specifications, including essential integrated OE components such as hose branches, quick-connectors, sensors, and restrictors.
• Small I.D. Molded Coolant Hose: Gates Small Inside Diameter Molded Coolant Hose is factory-molded, OEM-style hose designed to fit today's smaller, tighter-fitting engine compartments, suitable for coolant, water, and air applications and approved for marine use.
• Green Stripe® 2-Ply Straight Coolant Hose: Designed for demanding heavy-duty coolant and air applications.
• Premium Blue Stripe™ Coolant Hose: Built for premium high-temperature coolant, water, and air applications and suitable for OAT (organic additive technology) engine fluids. Temperature range spans -40°C to +135°C (-40°F to +275°F).

Construction Standards That Matter

Gates coolant hoses feature an EPDM tube, synthetic fiber knit reinforcement, and a heat- and ozone-resistant EPDM cover. Specifically engineered materials resist vacuum collapse, reducing the need for internal springs in many applications. Hoses meet recognized industry standards including SAE 20R4 EC Class D1, giving technicians and enthusiasts a reliable benchmark for quality and performance.

Whether you are maintaining a daily driver, servicing a fleet truck, or working on a marine engine, Gates coolant hoses are engineered to deliver the precision fit and long-term reliability that modern cooling systems demand. Browse the full coolant hose category or explore the complete Gates brand catalog to find the right hose for your application.