Flushing your transmission cooler is a necessary procedure. Suppose you don’t flush the old transmission fluid and contamination out of your transmission cooler. In that case, the new transmission fluid will wash the contaminated fluid into your replacement transmission and cause problems like sticky valves in the valve body.
How to flush your transmission cooler procedure:
- Blow compressed air (about 25 pounds per square inch) through one of the cooler lines to evacuate old fluid from the cooler lines and transmission cooler.
- Hook the transmission flush aerosol can to one transmission cooler line, put a catch can over the other cooler line, and force two cans of cooler flush through the cooler lines.
- Blow the excessive cooler flush out of the lines.
- The perfect flush should be clean on the last flush.
Youtube video.