ATF Cooler Cleaning: Notes

Special Tools Required 

• ATF cooler cleaner GHTTTCF6H
• Magnetic nonbypass spin-on filter GTHGNBP2 These special tools are available through the Honda Tool and Equipment Program 1-888-424-6857.

Before installing an overhauled or remanufactured automatic transmission, you must thoroughly clean the ATF cooler to prevent system contamination. Failure to do so could cause a repeat automatic transmission failure.

The cleaning procedure involves heated ATF-Z1 delivered under high pressure (100 psi). Check the security of all hoses and connections. Always wear safety glasses or a face shield, along with gloves and protective clothing. If you get ATF in your eyes or on your skin, rinse with water immediately.

1. Check the fluid in the cooler cleaner tank. (The fluid level should be 4.5 inches from the top of the filler neck.) Adjust the level if needed; do not overfill. Use only Honda ATF-Z1; do not use any additives.
   Fig 1: Checking Fluid In Cooler Cleaner Tank

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
2. Plug the cooler cleaner into a 110 V grounded electrical outlet.
   NOTE: Make sure the outlet has no other appliances (light fixtures, drop lights, extension cords) plugged into it. Also, never plug the cooler cleaner into an extension cord or drop light; you could damage the unit.