Honda Civic Service Manual: Coolant Replacement (R18A9)

Honda Civic Service Manual / Powertrain / Engine / Engine Cooling / Coolant Replacement (R18A9)

1.	Radiator Cap

Wait until the engine is cool, then carefully remove the radiator cap.

2.	Vehicle Lift

Raise the vehicle on a lift, and make sure it is securely supported.

3.	Radiator Coolant - Replacement

Loosen the drain plug (A), and drain the coolant.

4.	Cylinder Block Coolant - Drain (Except K24Z7 engine )

1.5mmn-mm

Except K24Z7 engine

Remove the drain bolt (A) from the rear side of the engine block.

After the coolant has drained, reinstall the drain bolt with a new washer.

Tighten the radiator drain plug securely.

1.	Radiator Coolant - Replacement (Natural Gas Model)

Follow the chart and pour coolant into the radiator up to the base of the filler neck.

NOTE:

Use Honda Long Life Antifreeze/Coolant Type 2, and if necessary add Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (concentrate). 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 (below -22 °F ( -30 °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 Honda Long Life Antifreeze/Coolant Type 2 (50/50)
Coolant Change	Normal Area (50/50)	50/50 60/40 unknown	Drain radiator, engine block, and reservoir	None	Top off the cooling system
	Very Cold Area (60/40)	50/50 unknown	Drain radiator, engine block, and reservoir	About 1.3 L (44 fl oz)
	Very Cold Area (60/40)	60/40	Drain radiator, engine block, and reservoir	About 1.1 L (37 fl oz)
Engine Overhaul	Normal Area (50/50)	-	-	None
Engine Overhaul	Very Cold Area (60/40)	-	-	About 1.1 L (37 fl oz)
Coolant Winterizing	Very Cold Area (60/40)	50/50	Drain about 2.0 L (68 fl oz) from radiator	About 1.1 L (37 fl oz)
Coolant Winterizing	Very Cold Area (60/40)	unknown*	Drain radiator, engine block, and reservoir	About 1.1 L (37 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.

Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal))

At Coolant Change	5.50 L (1.453 US gal)
After Engine Overhaul	6.51 L (1.720 US gal)

2.	HDS DLC - Connection

Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.

Turn the ignition switch to ON (II).

Make sure the HDS communicates with the vehicle. If it does not communicate, go to the DLC circuit troubleshooting.

3.	Maintenance Minder Reset

After doing all procedures, select the individual maintenance item you wish to reset with the HDS..

Engine Cooling

...

Water Passage Removal and Installation (K24Z7)

1211F4 1. Radiator Cap 1. Wait until the engine is cool, then carefully remove the radiator cap. ...

Honda Civic Service Manual: Coolant Replacement (R18A9)

Engine Cooling

Water Passage Removal and Installation (K24Z7)

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