Transmission Fluid Cooler Flushing. Chevrolet Brazil Blazer 1997

For 1990-2009 cars

#### Oil Cooler Line and Cooler Flushing

A transmission oil cooler and cooler line flushing must be performed when the transmission is removed from the vehicle for service or overhaul due to fluid contamination or pump and/or torque converter replacement. Flush the transmission cooling system after transmission installation will ensure that any contaminants remaining in the cooling system will not enter the transmission and reduce the operational efficiency and life of the transmission.

#### Preparation Procedure

1. After the overhauled or serviced transmission is installed in the vehicle, do not connect the oil cooler lines to the transmission fittings.

Notice: Shop air supply must be equipped with a water/oil filter and not exceed 825 kPa (120 psi), or personal injury may result.

2. Remove the fill cap on J 35944 and add 0.6 liter (20-21 ounces) of flushing solution. Do not overfill J 35944 with flushing solution or J 35944 will require recharging prior to the backflush procedure. Follow the manufacturer's suggested procedures for proper handling of the flushing solution.
3. Secure the fill cap and pressurize the flusher can with shop air to 550-700 kPa (80-100-psi).
4. Secure the discharge hose to the opposite end of the oil cooler line that connects to the lower fitting of the radiator.
5. Clip the discharge hose onto the drain container.
6. Mount the flushing tool to the undercarriage of the vehicle with the gook provided.
7. Secure the hose on the flushing tool to the opposite end of the oil cooler line that is connected to the upper connector on the radiator.
8. With the water valve on the tool in the OFF position, connect the water hose from the water supply to the tool.
9. Turn on the water supply at the faucet.

#### Initial Flushing Procedure

Caution: If water does not flow through the oil cooler (system is completely plugged), do not continue flushing procedure. Turn the water immediately and inspect the pipes and ooler for restrictions and repair, or personal injury could result.

1. Switch the water valve on the tool to the ON position. Allow the water to flow through the oil cooler and oil cooler lines for 10 seconds to remove most of the transmission oil from the cooling system.
2. Switch the water valve on the tool to the OFF position and clip the discharge hose on a 5 gallon pail with a lid, or position a shop towel over the end of the discharge hose to prevent splash. The discharge will foam vigorously when the solution is introduced into the water stream.
3. Switch the water valve on the tool to the ON position and depress the trigger to mix the flushing solution into the water flow. Use the balsa clip provided on the handle in order to hold the trigger down.

Notice: Shop air supply must be equipped with a water/oil filter and not exceed 825 kPa (120 psi), or personal injury may result.

4. Flush the oil cooler and oil cooler lines with water and solution for 2 minutes. During this flush, attach the air supply to the air valve located on the plumbing of the tool for 3-5 seconds at the end of every 15-20 second interval in order to create a surging action.
5. Release the trigger and switch the water valve on the tool to the OFF position.
6. Disconnect both hoses from the oil cooler lines.

#### Backflushing Procedure

1. Connect the hoses to the oil cooler lines opposite from the initial flushing procedures in order to perform a backflush.
2. Repeat the flushing procedure from the initial flushing procedure except, backflush the cooling system for only 1 minute.
3. Switch the water valve on the tool to the OFF position and turn the water supply OFF at the faucet.
4. Attach the air supply to the air valve located on the plumbing of the tool and dry the cooling system out with air for at least 2 minutes.

• | Dry the system for a longer period of time if the moisture is visible exiting from the oil cooler line discharge hose.

• | Use an air chuck clip, if available, in order to secure the air chuck onto the air valve for ease of operation.

5. Remove the discharge and flushing tool hoses from the oil cooler lines.
6. Connect the oil cooler lines to the transmission. Refer to Oil Cooler Hose/Pipe Replacement .
7. Clean the tool after every third use.

#### Tool Cleaning Procedure

• | Disconnect the water supply hose from the tool.

• | Bleed the air pressure from the can, remove the fill cap, return any unused solution to the solution container and rinse the can out with water. Do not store the tool with the solution in the tank.

• | Remove the screen from the plumbing and wash the screen with water.

• | Use the cleaning pin in order to remove any material in the solution orifice. The orifice is located in the plumbing below the screen.

• | Reconnect the plumbing and fill the can half with water, secure the fill cap, and pressurize the can to 550-700 kPa (80-100 psi).

• | Aim the tool into the 5 gallon pail or floor drain and depress the trigger to allow the water from the can to flow through he solution orifice for 30 seconds in order to ensure proper cleaning of the tool.

• | Bleed the air pressure from the can, remove the fill cap, and empty the can.

• | Reconnect the fill cap to the flushing tool.