Dorman 82596 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 a secure twist-on attachment. Dorman 82596 is a black plastic engine coolant reservoir cap with a 50.9 mm diameter, made to restore proper sealing at the reservoir on select GM compact cars.

Key Features

• Direct replacement engine coolant reservoir cap for select applications
• Twist-on attachment type for straightforward reservoir installation
• Black plastic construction with a 50.9 mm diameter
• Non-vented, non-pressurized design
• Low-profile cap dimensions: 1.615 in length and 2.003 in width
• Cross-references Dorman 825963 and GM 14081627 for the same application

Detailed Description

Dorman 82596 is engineered as a direct replacement coolant reservoir cap for vehicles that use a 50.9 mm twist-on cap. It is designed to replace the original cap on applications such as the Chevrolet Cavalier, Pontiac Sunbird, Buick Skyhawk, Buick Skylark, Cadillac Cimarron, Oldsmobile Firenza, Oldsmobile Calais, Oldsmobile Cutlass Calais, Pontiac Grand Am, Pontiac J2000 Sunbird, and Pontiac J2000 across the listed model years. If you are searching for a coolant reservoir cap for a 1982-1994 Chevrolet Cavalier or a 1986-1994 Pontiac Sunbird, this part number is a direct match for the specified fitments.

This part number, 82596, is intended to restore the reservoir opening with the correct twist-on style and physical dimensions. The cap is made from plastic and finished in black for a clean OE-style appearance. For buyers comparing Dorman 82596 against OE references, it cross-references Dorman 825963 and GM 14081627 for the same application.

Common Problems This Part Can Address

• Cracked coolant reservoir cap
• Lost or missing reservoir cap
• Damaged twist-on threads or sealing surface
• Improper reservoir closure after service
• Visible coolant reservoir opening exposure

Installation Notes and Tips

Confirm the reservoir cap diameter and attachment style before installation. This cap uses a twist-on design and is not vented or pressurized, so it should be matched to the original reservoir specification. Verify fitment by year, make, and model before ordering, especially on Chevrolet Cavalier, Pontiac Sunbird, and related GM compact platforms. Dorman 82596 installs in place of the original cap without requiring modification when the application matches the listed specifications.

Quality Assurance

Dorman manufactures replacement hardware and service parts to match original equipment fit and function where specified. This coolant reservoir cap is built as a direct replacement for the listed applications and follows the stated material, size, and attachment requirements for proper fitment.