Gates Molded Coolant Hose 23183 — Black OEM-fit, EPDM Reinforced for Engine Cooling

The Gates 23183 Premium Molded Coolant Hose is a ready-to-install, OEM-spec replacement hose engineered for reliable coolant routing in upper, lower, bypass and heater applications.

Designed and built to meet demanding automotive cooling system needs, this molded hose replaces factory parts without modifying vehicle routing. Gates combines purpose-formulated materials and precision shaping so the hose seals cleanly, resists collapse, and tolerates heat, ozone and common engine coolants. It’s part of Gates’ comprehensive molded coolant hose lineup made to save time and avoid dealer-only part hunts.

How does this hose match OEM fit and routing?

The Gates 23183 is pre-formed to replicate original hose angles and lengths so it installs in the same location with the same clamps and connections. Precise molding reduces installation adjustments and ensures a proper seal where the hose meets fittings.

• Pre-shaped geometry mirrors factory routing to prevent twists and kinks
• Dimensional tolerances aimed at OE compatibility for straightforward swap-in
• Smooth inner tube for consistent coolant flow and secure clamp seating

What materials protect the hose from failure?

Gates uses EPDM compounds for both the inner tube and outer cover, reinforced with a synthetic fiber knit to withstand pressure cycles and engine bay stresses. The material selection emphasizes resistance to ozone, heat and chemical additives found in modern coolants.

• EPDM tube and cover resist heat and common coolant chemistries
• Synthetic fiber knit reinforcement strengthens pressure and flex life
• Formulation reduces electrochemical degradation—the frequent root of hose breakdown

Will this hose collapse or restrict flow under vacuum?

The hose is engineered to resist collapse during engine vacuum conditions and rapid pressure swings, maintaining consistent coolant circulation. Reinforcement and wall construction preserve internal diameter under load to help avoid overheating or flow reduction issues.

• Designed to resist vacuum collapse for reliable coolant delivery
• Consistent internal profile minimizes turbulence and localized wear
• Reinforcement preserves shape during long-term flexing and thermal cycles

What standards and approvals does the hose meet?

The Gates 23183 conforms to established industry requirements so you get proven mechanical performance and interchangeability. While tolerances may vary, the hose meets SAE 20R4 class D2 and DIN 73411 class A benchmarks for molded coolant hose construction.

• Meets SAE 20R4, class D2 mechanical and material guidelines
• Complies with DIN 73411 class A criteria except for stated tolerance differences
• Manufactured to deliver consistent quality across replacement applications

Who is this for? Technicians, DIY mechanics and fleet maintenance teams who need a dependable, direct-fit radiator or heater hose replacement will benefit from the Gates 23183. It’s suited for anyone wanting a long-lasting molded coolant hose that reduces install time, minimizes returns, and resists the common causes of hose failure without needing dealer-only parts.

Key features at a glance:

• Pre-shaped molded design for accurate OEM routing and quick installation
• EPDM inner tube and cover with synthetic fiber knit reinforcement
• Heat-, ozone- and coolant-resistant construction for extended service life
• Engineered to resist vacuum collapse and electrochemical degradation
• Manufactured to SAE 20R4 class D2 and DIN 73411 class A requirements (tolerance exceptions noted)