Oil Cooler Flushing
Tools Required
Notice: Whenever you remove the transmission for service, you must perform the
automatic transmission oil cooler flushing procedure in order to remove the
existing fluid which may be contaminated. This will prevent contamination
of the new fluid. You must perform the flushing procedure after the installation
of the overhauled or replacement transmission.
Notice: Only use J 35944-20 Cooler Flushing Fluid with the J 35944-A
Oil Cooler and Line Flusher. Use of any other fluid can result in damage to
the tool, damage to the automatic transmission oil cooler components, or improper
flushing of the cooler. Do not reconnect the oil cooler pipes after you reinstall
the overhauled or service replacement transmission in the vehicle.
Preparation
- Remove the fill cap on J 35944-A
.
- Fill the can with 0.6 liter ( 20-21 ounces) of J 35944-22
, or equivalent, cooler flushing fluid.
Do not overfill. If you overfill, the tool will need recharging with air before
the backflush. Follow the manufacturer's suggested procedures for proper handling
of the solution.
Notice: Shop air supply must be equipped with a water/oil filter, and pressure
should not exceed 825 kPa (120 psi). Failure to use a water/oil
filter can allow residual moisture to cause corrosion of components. Excessive
air pressure can cause damage to components.
- Secure the fill cap, and pressurize the flusher with shop air to 550-700 kPa
(80-100 psi).
- Connect the discharge hose to the transmission end of the oil
cooler pipe that goes to the bottom fitting at the radiator.
- Clip the discharge hose to the oil drain container.
- Mount the flushing tool to the undercarriage of the vehicle with
the hook provided.
- Connect the hose from the flushing tool to the remaining oil cooler
pipe.
- With the water valve on the tool in the OFF position, connect
the water hose from the water supply to the tool.
- Turn ON the water supply at the faucet.
Initial Flushing
Notice: If water does not flow through the oil cooler (system is completely
plugged), do not continue the flushing procedure, or damage to the tool or
components could result. Turn the water OFF immediately. Inspect the pipes
and the cooler for restrictions. Replace the oil pipe(s) and/or the oil cooler.
- Switch the water valve on the tool to the ON position. Allow the water
to flow through the oil cooler for 10 seconds in order to remove the transmission
fluid in the system.
- Switch the water valve on the tool to the OFF position. Clip the
discharge hose onto a 5-gallon pail with a lid. If there is no lid,
place a shop towel over the end of the hose in order to prevent splash. The
discharge will foam vigorously when you introduce solution into the water
stream.
- Switch the water valve on the tool to the ON position. Depress
the trigger that mixes the flushing solution into the water flow. Use the
bale clip on the handle in order to hold down the trigger.
- Flush the oil cooler with water and solution for 2 minutes. During
the flush, attach the air supply to the air valve on the tool for 3 to 5 seconds
after every 15 to 20 second interval in order to create a surging action.
- Release the trigger. Switch the water valve on the tool to the
OFF position.
- Disconnect both hoses from the oil cooler pipes.
Backflush
| • | Connect the hoses to the oil cooler pipes opposite from the initial
flush in order to perform a backflush. |
| • | Switch water valve on the tool to the ON position. Depress the
trigger in order to mix the flushing solution with the water flow. Use the
bale clip on the handle to hold down the trigger. |
| • | Flush the oil cooler with water and solution for 2 minutes. During
this flush, attach the air supply to the air valve on the tool for 3 to 5
seconds after each 15 to 20 second interval in order to create a surging action. |
| • | Release the trigger. Allow water only to rinse the oil cooler
for 1 minute. |
| • | Switch the water valve on the tool to the OFF position. |
| • | Turn the water supply OFF at the faucet. |
| • | Attach the air supply to the air valve on the tool. Dry out the
system with air for at least 2 minutes. Dry out the system longer than 2 minutes,
if moisture from the oil cooler line discharge hose is visible. If available,
use an air chuck clip to secure the air chuck onto the air valve for ease
of operation. |
| | Important: The top fitting at the transmission is the cooler return. The bottom
fitting at the transmission is the cooler feed.
|
| • | Connect the cooler feed pipe to the transmission. |
| • | If not already connected, attach the discharge hose to the cooler
return pipe. Place the hose into an appropriate drain container. |
| • | After filling the transmission with DEXRON®-III or, if unavailable,
DEXRON®-IIE automatic transmission fluid, or equivalent, start the engine.
Run the engine for 30 seconds. This removes any residual moisture from the
oil cooler and the cooler pipes. |
| | You should get a minimum of 1.8 liters (2 quarts) of transmission fluid
during this 30 second run. If the flow of fluid is insufficient, disconnect
the oil cooler feed line at the radiator and restart the engine. |
| | Depending on the flow rate, do the following inspections: |
| • | Insufficient Feed Flow -- Inspect the transmission for the
cause. |
| • | Sufficient Feed Flow -- Inspect the oil cooler pipes and
the fittings for restrictions or leaks. Repeat the oil cooler flushing procedure.
Repeat the check of fluid flow out of the return line. If the flow is still
restricted, replace the transmission oil cooler. Refer to Transmission Oil Cooler Replacement
. |
| • | Remove the discharge hose. |
| • | Reconnect the cooler return pipe to the transmission. |
| • | Refill the unit to the proper fluid level. Refer to Transmission Fluid Checking Procedure
. |
