Hybrid Electric System Coolant Changing

1. Disconnect the 12-volt vehicle batteries to isolate the high voltage power source.
2. Drain the hybrid radiator, as follows.
   1. Place a large container under the hybrid radiator.
   2. Remove the cap from the coolant reservoir.
   3. If equipped with a petcock, open it at the bottom of the hybrid radiator to drain the coolant.
   4. Disconnect the lower radiator hose, and drain the remaining coolant.
   5. Close the petcock, if equipped.
3. Install the lower radiator hose.
4. Fill the system with a coolant mixture of 50 percent ethylene glycol and 50 percent water.
5. Using ServiceRanger, activate the HEV coolant pump to purge any air that may be trapped in the system. Run the cooling pump until the air bubbles stop appearing in the reservoir tank.
6. Check the coolant level, and add coolant as needed. The system should be filled to the mid level of the reservoir.