Dorman 626-557 HVAC Heater Hose Assembly - Inlet

Durable HVAC Heater Hose Assembly for Select GM Trucks and SUVs

The Dorman 626-557 HVAC heater hose assembly is designed to provide reliable heating system performance for a range of Cadillac, Chevrolet, GMC, and Hummer vehicles. Engineered with quality rubber material, this heater hose assembly ensures consistent coolant flow and heat transfer within your vehicle's HVAC system.

• Constructed from durable rubber with a natural, no-finish color
• Straight hose shape with a centerline length of 34 inches
• Features two branches with varying inside diameters: 0.99, 1.33, and 0.9 inches
• End 1 attaches via hose connection; End 2 uses a quick disconnect fitting
• Designed for a maximum working pressure of 100 psi
• Does not include clamps or protective sleeves
• Compatible with multiple GM models including Chevrolet Silverado, GMC Sierra, Cadillac Escalade, and Hummer H2

Detailed Product Description

The Dorman 626-557 heater hose assembly is a regular grade HVAC component made from high-quality rubber, ensuring flexibility and resistance to heat and pressure within the vehicle's heating system. Its straight hose design and multiple branch connections allow for efficient coolant routing in complex HVAC configurations. The assembly does not contain springs or protective sleeves, and it does not require a heat shield, simplifying installation and maintenance. The quick disconnect fitting on End 2 facilitates easier removal and replacement without compromising the seal or system integrity.

Compatible Vehicles and Applications

This heater hose assembly is compatible with a wide range of General Motors trucks and SUVs, including:

• Cadillac Escalade, Escalade ESV, and Escalade EXT
• Chevrolet Avalanche 1500 and 2500, Silverado 1500, 2500, and 3500 series (including Classic and HD variants)
• GMC Sierra 1500, 2500, and 3500 series (including Classic and HD variants)
• GMC Yukon and Yukon XL 1500 and 2500
• Hummer H2
• Chevrolet Suburban 1500 and 2500, Tahoe

Common Issues Addressed by This Heater Hose Assembly

• Leaking or cracked heater hoses causing coolant loss
• Reduced heating efficiency due to damaged or deteriorated hoses
• Coolant flow restrictions from collapsed or kinked hoses
• Difficulty in hose removal or replacement due to lack of quick disconnect fittings
• Wear from exposure to heat and pressure in the HVAC system

Installation Notes and Tips

• Ensure the vehicle is cool and the cooling system is depressurized before installation
• Verify hose diameters and branch locations match your vehicle’s HVAC layout
• Use appropriate clamps (not included) to secure hose ends firmly
• Inspect surrounding components for wear or damage during replacement
• Test the heating system after installation to confirm proper coolant flow and leak-free connections

Quality Assurance and Warranty

Dorman manufactures this heater hose assembly to meet or exceed OEM specifications for durability and performance. The part is constructed from quality rubber material designed to withstand typical HVAC system pressures up to 100 psi. While clamps and heat shields are not included or required, the assembly is engineered for reliable service life in compatible Cadillac, Chevrolet, GMC, and Hummer models. Warranty coverage details should be confirmed with the point of purchase or manufacturer.