Leaking trans cooler -- flush transmission?

YES, A transmission flush is generally recommended after you've had your transmission cooler leaking or any major repair done to the inside of your transmission. This will help to remove any debris or metal shavings left behind from the leak or repair and prevent potential damage to your transmission. By removing this debris, including fluid contaminated by the leak, metal shavings and gasket material, the transmission will be less likely to develop performance problems that can lead to costly repairs or a complete breakdown of the transmission.

Here's a detailed explanation of why a transmission flush is recommended after a transmission cooler leak:

1. Preventing Clogging: A transmission cooler leak can introduce contaminants such as dirt, debris, and moisture into the transmission fluid. These contaminants can clog the transmission filter and restrict the flow of fluid, leading to overheating and eventual transmission failure. A transmission flush helps to remove these contaminants and ensure proper fluid flow.

2. Removing Metal Shavings: When the transmission cooler leaks, metal shavings from the transmission components can enter the transmission fluid. These shavings can cause wear and tear on transmission parts, leading to reduced performance and increased risk of failure. A transmission flush removes these metal shavings and helps to extend the life of the transmission.

3. Mixing of Fluids: If the transmission cooler leaks, it may mix with engine coolant. This can contaminate the transmission fluid and cause it to lose its lubricating properties. A transmission flush helps to remove the contaminated fluid and replace it with fresh, clean fluid.

4. Restoring Fluid Levels: A transmission cooler leak can cause the transmission fluid level to drop below the recommended level. This can lead to insufficient lubrication and increased wear and tear on transmission parts. A transmission flush ensures that the transmission fluid is at the proper level and provides adequate lubrication.

5. Overall System Cleanliness: A transmission flush involves replacing all of the old transmission fluid with new fluid. This helps to remove any contaminants that may have accumulated over time and restore the overall cleanliness of the transmission system.

It's important to note that a transmission flush should be performed by a qualified technician to ensure proper procedures and fluid levels are maintained. Additionally, if the transmission has suffered significant damage due to the leak, a transmission flush may not be sufficient and further repairs or a transmission rebuild may be necessary.