Dorman 918-259 Automatic Transmission Oil Cooler

Automatic Transmission Oil Cooler for GM Trucks

Dorman 918-259 is a standard replacement automatic transmission oil cooler built to match the function of the original cooler on specified vehicles. It is designed for applications where the factory cooler has failed from heat, corrosion, or physical damage, helping restore proper fluid temperature control in GM truck and SUV platforms.

• Standard replacement automatic transmission oil cooler
• Aluminum core and aluminum construction
• Painted black finish
• Threaded inlet attachment with male-thread outlet attachment
• Core dimensions: 11 in. length, 11 in. width, 7 in. height, 1.4 in. thickness
• Inlet diameter: 0.37 in.; outlet diameter: 0.825 in.
• Designed for direct-fit service on specified Cadillac, Chevrolet, and GMC applications

Fitment Coverage

Compatible With 1999-2000 Cadillac Escalade, N/A.

• Fits 1996-2000 Chevrolet C2500, N/A
• Fits 1996-2000 Chevrolet C35, N/A
• Fits 1996-2000 Chevrolet C3500, N/A
• Fits 1996-2000 Chevrolet K2500, N/A
• Fits 1996-2000 Chevrolet K3500, N/A
• Fits 1996-2000 GMC C2500, N/A
• Fits 1996-2000 GMC C3500, N/A
• Fits 1996-2000 GMC K2500, N/A
• Fits 1996-2000 GMC K3500, N/A
• Fits 1996-1999 Chevrolet C1500, N/A
• Fits 1996-1999 Chevrolet C1500 Suburban, N/A
• Fits 1996-1999 Chevrolet C2500 Suburban, N/A
• Fits 1996-1999 Chevrolet K1500, N/A
• Fits 1996-1999 Chevrolet K1500 Suburban, N/A
• Fits 1996-1999 Chevrolet K2500 Suburban, N/A
• Fits 1996-1999 GMC C1500, N/A
• Fits 1996-1999 GMC C1500 Suburban, N/A
• Fits 1996-1999 GMC C2500 Suburban, N/A
• Fits 1996-1999 GMC K1500, N/A
• Fits 1996-1999 GMC K1500 Suburban, N/A
• Fits 1996-1999 GMC K2500 Suburban, N/A

What This Cooler Helps Address

• Transmission fluid temperature rise from a failed factory cooler
• Corrosion-related cooler leakage
• Damage from road debris or impact
• Reduced cooling performance in heavy-duty towing or hauling use
• Service replacement for aging GM truck and SUV cooling systems

Installation Notes

Verify inlet and outlet thread style, cooler dimensions, and line diameter before installation. This Dorman 918-259 transmission oil cooler is a direct replacement style part for specified Cadillac Escalade, Chevrolet C1500/C2500/C3500/K1500/K2500/K3500, and GMC C1500/C2500/C3500/K1500/K2500/K3500 applications. The package contents list one automatic transmission oil cooler; mounting hardware is not included.

This part cross-references OE numbers 15995536 and 89022535 for the same application.

Quality Assurance

Dorman engineers this cooler as a standard replacement component to match original cooler function on listed vehicles. Part number 918-259 is built for specified GM applications and uses aluminum construction for service replacement in the transmission cooling system.