Dorman 82594 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap Replacement

Replace a cracked, missing, or worn coolant reservoir cap with this Dorman engine coolant reservoir cap. Part number 82594 is a direct replacement built with a black plastic twist-on design for a secure seal on the reservoir.

Compatible with a wide range of Chevrolet, GMC, Buick, Hummer, Pontiac, Oldsmobile, and Saab applications, including many Express, Savana, Trailblazer, Envoy, and S10 platform vehicles.

Key Features

• Direct replacement engine coolant reservoir cap
• Black plastic construction
• Twist-on attachment type for straightforward installation
• Non-pressurized, non-vented design
• Diameter: 51.18 mm
• Part number 82594 for easy identification

Detailed Description

Dorman 82594 is engineered to replace the original engine coolant reservoir cap when the factory cap is cracked, lost, or no longer sealing properly. The twist-style cap is made from plastic and measures 51.18 mm in diameter, with a compact black profile that matches the reservoir opening on listed applications. This cap is a practical OE-style replacement for vehicles such as the Chevrolet Express 2500, GMC Savana 3500, and Chevrolet Trailblazer, along with additional GM and Saab fitments listed below. This part cross-references GM 15060681 for the same application.

What It Helps Fix

• Coolant reservoir cap that is cracked or broken
• Cap that is missing or no longer retained properly
• Improper sealing at the coolant reservoir opening
• Reservoir cap replacement after service or inspection
• Restoration of the original twist-on cap style

Installation Notes and Fitment

Install by aligning the cap with the reservoir neck and turning it into place until fully seated. Verify the reservoir opening style and diameter before installation. Compatible With:

• Fits 2019 Chevrolet Express 2500, N/A
• Fits 2019 Chevrolet Express 3500, N/A
• Fits 2019 GMC Savana 2500, N/A
• Fits 2019 GMC Savana 3500, N/A
• Fits 2015-2018 Chevrolet Express 2500, N/A
• Fits 2015-2018 Chevrolet Express 3500, N/A
• Fits 2015-2018 GMC Savana 2500, N/A
• Fits 2015-2018 GMC Savana 3500, N/A
• Fits 1996-2014 Chevrolet Express 1500, N/A
• Fits 2010-2014 Chevrolet Express 3500, N/A
• Fits 1996-2014 GMC Savana 1500, N/A
• Fits 2006-2010 Hummer H3, N/A
• Fits 2009-2010 Hummer H3T, N/A
• Fits 2002-2009 Chevrolet Trailblazer, N/A
• Fits 2002-2009 GMC Envoy, N/A
• Fits 2005-2009 Saab 9-7x, N/A
• Fits 2007-2008 Chevrolet Colorado, N/A
• Fits 2008 GMC Canyon, N/A
• Fits 2005-2007 Buick Rainier, N/A
• Fits 2007 GMC Canyon, N/A
• Fits 2002-2006 Chevrolet Trailblazer EXT, N/A
• Fits 2002-2006 GMC Envoy XL, N/A
• Fits 2000-2005 Buick LeSabre, N/A
• Fits 1995-2005 Chevrolet Astro, N/A
• Fits 1995-2005 Chevrolet Blazer, N/A
• Fits 2004-2005 GMC Envoy XUV, N/A
• Fits 1995-2005 GMC Safari, N/A
• Fits 2000-2005 Pontiac Bonneville, N/A
• Fits 1995-2004 Chevrolet S10, N/A
• Fits 1995-2004 GMC Sonoma, N/A
• Fits 1996-2004 Oldsmobile Bravada, N/A
• Fits 2001-2002 Chevrolet G30, N/A
• Fits 1998-2000 Chevrolet Express 3500, N/A
• Fits 1996 Chevrolet G30, N/A
• Fits 1996 GMC G3500, N/A
• Fits 1994 Chevrolet S10, N/A
• Fits 1994 Chevrolet S10 Blazer, N/A
• Fits 1994 GMC Jimmy, N/A
• Fits 1994 GMC Sonoma, N/A
• Fits 1994 Oldsmobile Bravada, N/A

Quality Assurance

Dorman manufactures replacement parts to match original equipment fit and function for listed applications. Part number 82594 is built as a direct replacement coolant reservoir cap for the vehicles shown above.