Coolant Replacement and Check (Electric Powertrain): Replacement

NOTE: 

• How to read the replacement symbols .
• Running the PCU electric coolant pump without coolant may cause damage to the pump. The pump may get activated when the vehicle is turned to the ON mode.
• PCU coolant is poisonous. If ingested, get medical attention immediately.
• Use covers to avoid damaging painted surfaces.
• Do not spill the PCU coolant on the surrounding parts. If you spill the PCU coolant, wipe the PCU coolant off immediately.

1. Expansion Tank Cap - Remove

   Courtesy of HONDA, U.S.A., INC.

   1. Wait until the PCU coolant is cool, then carefully remove the expansion tank cap (A).

2. Front Bumper - Remove
3. PCU Coolant - Drain

   Courtesy of HONDA, U.S.A., INC.

   1. Loosen the radiator drain plug (A), and drain the PCU coolant. 2. Tighten the radiator drain plug securely with a new O-ring.

4. PCU Coolant - Refill

   1. Install the coolant charger (A), then pour Honda Long Life Antifreeze/Coolant Type 2 until the expansion tank is filled to the MAX mark (B).

   NOTE:

   • Always use Honda Long Life Antifreeze/Coolant Type 2, and if necessary add Honda Extreme Cold Weather Antifreeze/Coolant Type 2. Using a non-Honda coolant can result in corrosion, causing the cooling system to malfunction or fail.
   • Honda Long Life Antifreeze/Coolant Type 2 is a mixture of 50 % antifreeze and 50 % water. Honda Extreme Cold Weather Antifreeze/Coolant Type 2 is a 100 % concentration coolant. Do not add water to either coolant.
   • If the vehicle is regularly driven in very low temperatures (lower than - 22 deg. F (- 30 deg. C)), a 60 % concentration of coolant should be used.

   Operation	Vehicle Usage (Desired Mixture)	Current Mixture	Coolant Drain	Add Amount of Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (100 % concentrate)	Then add Acura Long Life Antifreeze/Coolant Type 2 (50/50)
   PCU Coolant Change	Normal Area (50/50)	50/5060/40 unknown	Drain radiator and expansion tank	None	Top off the cooling system
   	Very Cold Area (60/40)	50/50 unknown	Drain radiator and expansion tank	About 0. 3 L (10 fl oz)
   		60/40		About 0. 2 L (7 fl oz)
   PCU Removal	Normal Area (50/50)	-	-	None
   	Very Cold Area (60/40)	-	-	About 0. 3 L (10 fl oz)
   PCU Coolant Winterizing	Very Cold Area (60/40)	50/50	Drain about 0. 3 L (10 fl oz) from radiator	About 0. 3 L (10 fl oz)
   		unknown*	Drain radiator and expansion tank	About 0. 3 L (10 fl oz)

   *: When you want to winterize the coolant with the minimum amount of coolant change but the current coolant concentration in the vehicle is unknown, you must drain all coolant from the cooling system.

   PCU Coolant Refill Capacities (Including the expansion tank capacity of 0. 31 L (0. 082 US gal))
   At PCU Coolant Change	0. 93 L (0. 246 US gal)
   At PCU removal	1. 60 L (0. 423 US gal)

   Courtesy of HONDA, U.S.A., INC.

   Courtesy of HONDA, U.S.A., INC.

5. PCU Coolant - Air Bleed

   1. Connect the Honda GR8 battery diagnostic station and set it to the power supply mode. 2. Connect the HDS to the data link connector (DLC) 3. Select the Adjustment MENU in the Electric Powertrain system with the HDS. 4. Select the Coolant Air Bleeding. 5. Press the START to drive the PCU electric coolant pump (EWP), then wait more than 10 minutes. NOTE: Pour coolant as needed when the coolant level drops. If the coolant level keeps changing or bubbles are seen even after 10 minutes, continue to drive the EWP until the coolant level stabilizes and there are no more bubbles. When the POWER SYSTEM indicator comes on, clear the DTC with the HDS, then return to step 2. 6. Press the STOP to finish driving the EWP forcibly. 7. Check the coolant level and add coolant as necessary until it is at the MAX mark. 8. Install the expansion tank cap.

6. Front Bumper - Install