Dorman 918-645 Automatic Transmission Oil Cooler - Front
Dorman 918-645 Transmission Oil Cooler
Dorman 918-645 is an automatic transmission oil cooler built as a standard replacement for the original unit on select Chevrolet and GMC trucks. It is designed to restore cooling performance after the factory cooler has failed from heat, corrosion, or physical damage.
With an aluminum core and painted finish, this cooler is built for front-mounted applications on 2019-2025 Chevrolet Cheyenne, 2019-2024 Chevrolet Silverado 1500, 2025 Chevrolet Silverado, 2025 Chevrolet Silverado 1500, 2019-2025 GMC Sierra, 2019-2024 GMC Sierra 1500, and 2025 GMC Sierra 1500. This part number is also listed as a direct cross-reference for 23409058 and 84300079.
Key Features
- Automatic transmission oil cooler for OE-style replacement
- Aluminum core material for efficient heat transfer
- Painted black housing finish
- Threaded inlet and outlet attachment types
- Standard replacement grade for select Chevrolet Silverado and GMC Sierra applications
- Front-position fitment on listed 2025 Silverado and Sierra applications
- Dorman part number 918-645 for easy identification
Detailed Description
Dorman 918-645 is engineered to match the function of the original transmission cooler on specified vehicles, helping maintain proper fluid temperature in demanding driving conditions. The aluminum construction, 8-row core design, and threaded connections support a direct replacement approach for trucks that rely on stable transmission cooling for consistent operation. If you are replacing a damaged cooler on a Chevrolet Silverado 1500 or GMC Sierra 1500, this unit provides a practical OE-style solution.
Use this cooler when the original unit has been compromised by corrosion, impact, or heat-related wear. It is listed for 2019-2025 Chevrolet Cheyenne, 2019-2024 Chevrolet Silverado 1500, 2025 Chevrolet Silverado, 2025 Chevrolet Silverado 1500, 2019-2025 GMC Sierra, 2019-2024 GMC Sierra 1500, and 2025 GMC Sierra 1500 applications.
What It Helps Address
- Transmission fluid overheating caused by a failed cooler
- Loss of cooling performance from corrosion or damage
- Temperature instability during towing or heavy-duty use
- Replacement needs after impact or road debris damage
- OE cooler failure on select Chevrolet Silverado and GMC Sierra trucks
Installation Notes and Tips
Verify vehicle fitment by year, make, model, and position before installation. Inspect the surrounding cooling system, lines, and mounting points for wear or contamination before replacing the cooler. Threaded inlet and outlet connections should be matched carefully to the vehicle’s existing setup, and the system should be checked for leaks after installation.
Quality Assurance
Dorman designs replacement components to match original function on specified vehicles, and this cooler follows that standard replacement approach for listed Chevrolet and GMC applications. Part number 918-645 is built for direct-fit service on the vehicles shown in the fitment data.
Dorman 918-645 Automatic Transmission Oil Cooler - Front
Dorman 918-645 Transmission Oil Cooler
Dorman 918-645 is an automatic transmission oil cooler built as a standard replacement for the original unit on select Chevrolet and GMC trucks. It is designed to restore cooling performance after the factory cooler has failed from heat, corrosion, or physical damage.
With an aluminum core and painted finish, this cooler is built for front-mounted applications on 2019-2025 Chevrolet Cheyenne, 2019-2024 Chevrolet Silverado 1500, 2025 Chevrolet Silverado, 2025 Chevrolet Silverado 1500, 2019-2025 GMC Sierra, 2019-2024 GMC Sierra 1500, and 2025 GMC Sierra 1500. This part number is also listed as a direct cross-reference for 23409058 and 84300079.
Key Features
- Automatic transmission oil cooler for OE-style replacement
- Aluminum core material for efficient heat transfer
- Painted black housing finish
- Threaded inlet and outlet attachment types
- Standard replacement grade for select Chevrolet Silverado and GMC Sierra applications
- Front-position fitment on listed 2025 Silverado and Sierra applications
- Dorman part number 918-645 for easy identification
Detailed Description
Dorman 918-645 is engineered to match the function of the original transmission cooler on specified vehicles, helping maintain proper fluid temperature in demanding driving conditions. The aluminum construction, 8-row core design, and threaded connections support a direct replacement approach for trucks that rely on stable transmission cooling for consistent operation. If you are replacing a damaged cooler on a Chevrolet Silverado 1500 or GMC Sierra 1500, this unit provides a practical OE-style solution.
Use this cooler when the original unit has been compromised by corrosion, impact, or heat-related wear. It is listed for 2019-2025 Chevrolet Cheyenne, 2019-2024 Chevrolet Silverado 1500, 2025 Chevrolet Silverado, 2025 Chevrolet Silverado 1500, 2019-2025 GMC Sierra, 2019-2024 GMC Sierra 1500, and 2025 GMC Sierra 1500 applications.
What It Helps Address
- Transmission fluid overheating caused by a failed cooler
- Loss of cooling performance from corrosion or damage
- Temperature instability during towing or heavy-duty use
- Replacement needs after impact or road debris damage
- OE cooler failure on select Chevrolet Silverado and GMC Sierra trucks
Installation Notes and Tips
Verify vehicle fitment by year, make, model, and position before installation. Inspect the surrounding cooling system, lines, and mounting points for wear or contamination before replacing the cooler. Threaded inlet and outlet connections should be matched carefully to the vehicle’s existing setup, and the system should be checked for leaks after installation.
Quality Assurance
Dorman designs replacement components to match original function on specified vehicles, and this cooler follows that standard replacement approach for listed Chevrolet and GMC applications. Part number 918-645 is built for direct-fit service on the vehicles shown in the fitment data.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Dorman 918-645 Transmission Oil Cooler
Dorman 918-645 is an automatic transmission oil cooler built as a standard replacement for the original unit on select Chevrolet and GMC trucks. It is designed to restore cooling performance after the factory cooler has failed from heat, corrosion, or physical damage.
With an aluminum core and painted finish, this cooler is built for front-mounted applications on 2019-2025 Chevrolet Cheyenne, 2019-2024 Chevrolet Silverado 1500, 2025 Chevrolet Silverado, 2025 Chevrolet Silverado 1500, 2019-2025 GMC Sierra, 2019-2024 GMC Sierra 1500, and 2025 GMC Sierra 1500. This part number is also listed as a direct cross-reference for 23409058 and 84300079.
Key Features
- Automatic transmission oil cooler for OE-style replacement
- Aluminum core material for efficient heat transfer
- Painted black housing finish
- Threaded inlet and outlet attachment types
- Standard replacement grade for select Chevrolet Silverado and GMC Sierra applications
- Front-position fitment on listed 2025 Silverado and Sierra applications
- Dorman part number 918-645 for easy identification
Detailed Description
Dorman 918-645 is engineered to match the function of the original transmission cooler on specified vehicles, helping maintain proper fluid temperature in demanding driving conditions. The aluminum construction, 8-row core design, and threaded connections support a direct replacement approach for trucks that rely on stable transmission cooling for consistent operation. If you are replacing a damaged cooler on a Chevrolet Silverado 1500 or GMC Sierra 1500, this unit provides a practical OE-style solution.
Use this cooler when the original unit has been compromised by corrosion, impact, or heat-related wear. It is listed for 2019-2025 Chevrolet Cheyenne, 2019-2024 Chevrolet Silverado 1500, 2025 Chevrolet Silverado, 2025 Chevrolet Silverado 1500, 2019-2025 GMC Sierra, 2019-2024 GMC Sierra 1500, and 2025 GMC Sierra 1500 applications.
What It Helps Address
- Transmission fluid overheating caused by a failed cooler
- Loss of cooling performance from corrosion or damage
- Temperature instability during towing or heavy-duty use
- Replacement needs after impact or road debris damage
- OE cooler failure on select Chevrolet Silverado and GMC Sierra trucks
Installation Notes and Tips
Verify vehicle fitment by year, make, model, and position before installation. Inspect the surrounding cooling system, lines, and mounting points for wear or contamination before replacing the cooler. Threaded inlet and outlet connections should be matched carefully to the vehicle’s existing setup, and the system should be checked for leaks after installation.
Quality Assurance
Dorman designs replacement components to match original function on specified vehicles, and this cooler follows that standard replacement approach for listed Chevrolet and GMC applications. Part number 918-645 is built for direct-fit service on the vehicles shown in the fitment data.
