Dorman 902-0065 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap Replacement

Replace a cracked, missing, or worn coolant reservoir cap with a direct-fit Dorman solution built for pressurized cooling systems. Dorman 902-0065 is a black plastic, threaded twist cap with an 18 psi pressure rating and a 76.2 mm diameter for a secure seal on the coolant tank.

For drivers searching for an engine coolant reservoir cap for Chevrolet Silverado or GMC Sierra cooling system service, this part provides a straightforward OE-style replacement. It is also a practical choice when looking for Dorman 902-0065 coolant reservoir cap replacement by part number.

Key Features

• Direct replacement engine coolant reservoir cap
• Twist-on, threaded attachment for secure installation
• Pressurized design rated at 18 psi
• Black plastic construction
• 76.2 mm diameter for proper reservoir fit
• No vented design and no pressure release lever

Detailed Description

Dorman 902-0065 is engineered to replace an original coolant reservoir cap that has cracked, gone missing, or no longer seals correctly. The pressurized design helps maintain cooling system pressure, while the threaded twist style supports a tight connection to the reservoir neck. This cap is intended for vehicles that use a 76.2 mm coolant tank cap with an 18 psi rating, making it a direct replacement for the specified application.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. If you are servicing a Chevrolet Silverado or GMC Sierra cooling system, Dorman 902-0065 offers a replacement built around the original cap dimensions and pressure specification.

What It Helps Solve

• Coolant loss from a damaged or poorly sealing reservoir cap
• Pressure drop in the cooling system caused by a worn cap
• Cracks in the original plastic cap
• A missing coolant tank cap after service or repair
• Improper reservoir sealing on the coolant expansion tank

Installation Notes and Tips

Verify the reservoir neck diameter, pressure rating, and thread style before installation. Inspect the sealing surface on the coolant tank for debris, cracks, or deformation, and make sure the cap seats fully before returning the vehicle to service. For Chevrolet Silverado and GMC Sierra applications, confirm the original cap specification matches 76.2 mm and 18 psi.

Quality Assurance

Dorman 902-0065 is a direct replacement part engineered to match the original coolant reservoir cap specification for the listed application. Part number 902-0065 is designed for consistent fit and function in the cooling system.