Radiator Pressure-Flushing and Coolant Change
- Apply the vehicle parking brakes, then chock the tires. Tilt the hood.
- Place a suitable container under the elbow of the radiator outlet pipe and the radiator. The container should hold at least 60 quarts (59 liters) of fluid.
- Remove the surge tank cap.
- Remove the drain plugs from the radiator tank. Allow the coolant to drain.
- Disconnect the radiator upper and lower hoses, and install the surge tank cap and the radiator tank drain plug. Attach the flushing gun nozzle to the radiator at the lower radiator hose opening. Run the water until the radiator is full.
- Gradually, apply up to 15 psi (100 kPa) air pressure to
help dislodge sediment that has built up in the radiator core.
- Shut off the air at the pressure gun nozzle and allow the radiator to refill with water.
- Repeat the previous two steps until clean water flows from the radiator.
- Remove the radiator drain plug and allow the radiator to drain. Install and tighten the drain plug after the radiator has been drained. Do not overtighten.
- Connect the hoses using Breeze Constant-Torque clamps,
see Fig..
When installing Breeze Constant-Torque hose clamps, the clamps must be tightened to the correct torque. The screw tip of the clamp must extend about 1/4 inch (6 mm) from the clamp housing, and the Belleville washer stacks must be collapsed almost flat. Use a torque wrench to install these clamps correctly. The correct installation torque is as follows:
For Breeze Constant-Torque clamps with a 5/16-inch tightening screw hex: 55 lbf·in (620 N·cm).
For Breeze Constant-Torque clamps with a 3/8-inch tightening screw hex: 90 lbf·in (1020 N·cm).
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The screw tip must extend about 1/4 inch (6 mm).
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Belleville washers must collapse almost flat.
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Tightening Screw Hex
Fig. 1, Breeze Constant-Torque Hose Clamp Installation
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- Refill the radiator with coolant.
- Replace the surge tank cap(s).
- Return the hood to the operating position.
- Run the de-aeration procedure using DiagnosticLink.
- Shut off the vehicle, then check the coolant level in the
surge tank. Add coolant if the level isn't at the MAX line on the
surge tank.
Caution: When flushing the radiator, do not apply more than 15 psi (100 kPa) air pressure. Excessive pressure can damage the radiator.
Note: All hose clamps will lose torque after installation due to "compression set." However, when correctly installed, Breeze Constant-Torque clamps will hold enough torque to automatically adjust and keep consistent sealing pressure. During vehicle operation and shutdown, the screw tip may adjust according to temperature and pressure changes. The torque may need to be adjusted for individual applications.
Important: The approved coolant for eCascadia is Extended Life Coolant (ELC) with Organic Acid Technology (OAT) per Detroit Fluid Specification (DFS) 93K217. For additional information, see DDC-SVC-BRO-0002 on the DTNA Connect Portal.