Gates 18899 HVAC Heater Hose - Heater To Engine

Gates Molded Heater Hose for Mazda B-Series

The Gates Molded Heater Hose, part number 18899, is a factory-molded coolant hose built for tight engine bays and OEM-style routing. It is made from EPDM and is approved for coolant, water, air, and marine applications.

Compatible With 1986-1992 Mazda B2000 and Mazda B2200 heater-to-engine routing, this molded hose supports the original hose path in compact HVAC and cooling layouts. The Gates 18899 is shaped for a precise fit where straight hose sections are not practical.

Key Features

• Factory-molded, OEM-style hose construction
• EPDM material for coolant, water, and air service
• Small inside diameter: 0.62 in. / 16 mm at both ends
• Centerline length: 17 in. / 432 mm
• Approved for marine applications
• Fits heater-to-engine routing on select Mazda B-Series trucks

Product Details

Gates Molded Heater Hose 18899 is built for applications that require a formed hose with the correct bends and length to match the vehicle’s original routing. The molded design helps maintain proper hose alignment in smaller, tighter-fitting engine compartments, while the EPDM construction is suited for common underhood fluid and air transfer needs. This part cross-references Dayco 87712 for the same application.

Common Issues This Hose Can Address

• Cracked or aged heater hose on the Mazda B2000 or Mazda B2200
• Improper hose routing after a cooling system repair
• Leaks at a worn molded hose section
• Fitment problems caused by using a straight hose where a formed hose is required
• Restricted heater circuit flow from a deteriorated hose

Installation Notes

Verify the hose path, end diameters, and centerline length before installation. This hose is listed for 1986-1987 Mazda B2000, heater to engine, and 1987-1992 Mazda B2200, heater to engine. Confirm the routing matches the original molded shape and inspect adjoining clamps, fittings, and coolant connections during service.

Quality Assurance

Gates manufactures this molded heater hose as an OEM-style replacement for select Mazda B-Series applications. Part number 18899 is built to match the fitment and routing requirements of the listed vehicles.