When adding or changing the fluid in the system, create a 50/50 mixture of high quality ethylene glycol antifreeze and water.
The fluid level may be checked by observing the fluid level marks of the recovery tank. The level should be below the ADD mark when the system is cold. At normal operating temperatures, the level should be between the ADD and the FULL marks. Only add coolant to bring the level to the FULL mark.
DRAINING AND REFILLING
- With a cool engine, slowly rotate the radiator cap counterclockwise to the detent without pressing down on the cap.
- Wait until any remaining pressure is relieved by listening for a hissing sound.
- After all the pressure is relieved, press down on the cap and continue to rotate the radiator cap counterclockwise.
- With a suitable container to catch the fluid under the radiator, open the radiator draincock. If equipped, remove the engine block drain plugs to drain the coolant from the block.
- Loosen or slide the recovery tank hose clamp at the radiator filler neck overflow tube and remove the hose. Holding the hose down to the drain pan, drain the recovery tank. Attach the hose to the filler neck overflow and tighten the clamp.
- Close the radiator draincock and install the engine block drain plug.
- With the engine idling, add coolant until the level reaches the bottom of the filler neck. Install the radiator cap, making sure that the arrows on the cap line up with the overflow tube.
- Add coolant to the recovery tank.
- After filling the radiator and recovery tank, run the engine until it reaches normal operating temperature, to make sure that the thermostat has opened and all the air is bled from the system.
FLUSHING AND CLEANING THE SYSTEM
See Figure 1
The cooling system should be drained, thoroughly flushed and refilled at least every 30,000 miles or 24 months according to manufacturer recommendations, although it is recommended that the system be flushed once a year. These operations should be done with the engine cold.
- Remove the radiator and recovery tank caps. Run the engine until the upper radiator hose gets hot. This means that the thermostat is open and the coolant is flowing through the system.
- Turn the engine OFF and place a large container under the radiator. Open the draincock at the bottom of the radiator. Remove the block drain plugs to speed up the draining process.
- At the dash, set the heater TEMP control lever to the fully HOT position. Close the drain valve, install the block drain plug and add water until the system is full. Repeat the draining and filling process several times, until the liquid is nearly colorless.
- Remove the recovery tank and rinse it out with clean water. Install the recovery tank.
- After the last draining, fill the system with a 50/50 mixture of ethylene glycol and water. Run the engine until the system is hot and add coolant, if necessary. Replace the caps and check for any leaks.