Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your Derale 13501 Series 8000 Plate and Fin Transmission Oil Cooler. Please read these instructions thoroughly before beginning installation to ensure safe and effective use of the product. Retain this manual for future reference.
Product Overview
The Derale 13501 Series 8000 Plate and Fin Transmission Oil Cooler is designed to reduce transmission fluid temperatures, which can extend the life of your transmission and fluid. Its robust construction and efficient design contribute to optimal thermal performance.

Image: The Derale 13501 Series 8000 Plate and Fin Transmission Oil Cooler, shown with the included installation kit components: the cooler unit, rubber hose, hose clamps, mounting pads, and zip ties.
Key Features
- Embossed Turbulators: Inserted in each tube to agitate fluid for maximum heat transfer efficiency.
- Extruded Plastic Cooling Fin Guards: Provides protection for the cooling fins.
- Improved Transmission Performance: Designed to enhance the overall performance and longevity of the transmission.
- Sturdy Construction: Features furnace-brazed aluminum construction for durability.
Package Contents
Verify that all components are present before beginning installation:
- Derale 13501 Series 8000 Plate and Fin Transmission Oil Cooler Unit
- Flexible Rubber Hose
- Hose Clamps (typically 4-6)
- Mounting Hardware (e.g., zip ties, foam pads, rubber washers, brass fitting)
Safety Information
WARNING: Automotive work can be dangerous. Always follow proper safety procedures. Failure to do so may result in personal injury or property damage.
- Wear appropriate personal protective equipment, including safety glasses and gloves.
- Ensure the vehicle is securely supported on jack stands or a lift.
- Allow the engine and transmission to cool completely before working on the vehicle.
- Be aware of hot fluids and surfaces.
- Dispose of old fluids and materials responsibly according to local regulations.
- If you are unsure about any step, consult a qualified automotive technician.
Setup and Installation
Professional installation is recommended. The following steps are general guidelines and may vary based on vehicle make and model.
- Preparation: Park the vehicle on a level surface, engage the parking brake, and allow the engine and transmission to cool. Disconnect the negative battery terminal.
- Locate Mounting Area: Identify a suitable location for the cooler, typically in front of the radiator or air conditioning condenser, ensuring adequate airflow and clearance from other components.
- Mount the Cooler: Use the provided mounting hardware (zip ties, foam pads) to securely attach the cooler to the chosen location. Ensure the cooler is stable and does not obstruct critical airflow to the radiator.
- Identify Transmission Lines: Determine which transmission line is the return line from the factory cooler (if applicable). The new cooler should be installed in series with the existing cooling system.
- Cut and Connect Hoses: Carefully cut the factory transmission return line and install the provided hose and fittings. Ensure all connections are tight and secure using the hose clamps. Avoid kinks in the hose.
- Route Hoses: Route the new transmission cooler hoses away from hot exhaust components, sharp edges, and moving parts. Secure hoses with zip ties as needed.
- Fill and Check Fluid: After installation, refill the transmission fluid to the manufacturer's recommended level. Start the engine, allow it to reach operating temperature, and check for leaks around all connections. Recheck fluid level.
- Final Inspection: Ensure all tools are removed and all components are securely fastened.
Operating Instructions
The Derale 13501 Transmission Oil Cooler operates passively by utilizing airflow to dissipate heat from the transmission fluid. No active controls or adjustments are required during normal operation. The cooler continuously works to maintain optimal transmission fluid temperatures once installed correctly.
Maintenance
Regular inspection of your transmission oil cooler system is recommended to ensure continued performance and safety.
- Periodic Visual Inspection: Annually or during routine vehicle maintenance, inspect the cooler for any signs of damage, corrosion, or leaks.
- Hose and Clamp Check: Verify that all hoses are free of cracks, chafing, or hardening, and that hose clamps remain tight.
- Fin Cleaning: Gently clean any debris (e.g., leaves, insects) from the cooler fins to ensure unrestricted airflow. Use compressed air or a soft brush, being careful not to bend the fins.
- Fluid Level Check: Regularly check your transmission fluid level and condition according to your vehicle manufacturer's recommendations.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Fluid Leakage | Loose hose clamps, damaged hose, damaged cooler, improper fitting installation. | Tighten clamps, replace damaged hoses/cooler, re-install fittings correctly. Check fluid level. |
| Insufficient Cooling | Obstructed airflow to cooler, cooler too small for application, internal blockage. | Clear obstructions from fins, ensure proper mounting location, consult a professional for application suitability. |
| Hose Kinks | Improper hose routing. | Re-route hoses to avoid sharp bends. Kinked hoses restrict fluid flow and reduce cooling efficiency. |
If troubleshooting steps do not resolve the issue, contact Derale customer support or a qualified automotive technician.
Specifications
| Model Number | 13501 |
| Type | Plate and Fin Transmission Oil Cooler |
| Material | Furnace-brazed Aluminum |
| Approximate Dimensions (L x W x H) | 18.4 x 8 x 2.2 inches |
| Item Weight | 2 pounds |
| Manufacturer Part Number | 13501 |
| OEM Part Number | 13501 |
Warranty and Support
For specific warranty information, please refer to the documentation included with your purchase or visit the official Derale website. For technical support or inquiries, please contact Derale customer service directly.
Derale Website: www.derale.com





