Honda Civic Service Manual: Thermostat Housing Removal and Installation (R18A9)

Honda Civic Service Manual / Powertrain / Engine / Engine Cooling / Thermostat / Thermostat Housing Removal and Installation (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.	Intake Air Pipe

Remove the intake air pipe.

5.	Thermostat Housing Peripheral Assembly (Natural Gas Model)

Disconnect the connectors (A).

Remove the harness clamps (B).

Disconnect the connector (A).

Remove the harness clamp (B).

Remove the harness bracket (A).

Disconnect the lower radiator hose (B), the water bypass hose (C), and the heater hose (D).

6.	Thermostat

Remove the thermostat cover (A).

Remove the thermostat (B).

7.	Thermostat Housing (Natural Gas Model)

Remove the thermostat housing.

1.	Thermostat Housing (Natural Gas Model)

Install the thermostat housing (A), using a new gasket (B) and new O-ring (C).

2.	Thermostat

Install the thermostat (A) with a new rubber seal (B).

Install the thermostat cover (C).

3.	Thermostat Housing Peripheral Assembly (Natural Gas Model)

Connect the lower radiator hose (A), the water bypass hose (B), and the heater hose (C).

Install the harness bracket (D).

Install the harness clamp (A).

Connect the connector (B).

Install the harness clamps (A).

Connect the connectors (B).

4.	Intake Air Pipe

Install the intake air pipe.

5.	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)

6.	Maintenance Minder Reset

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

Thermostat

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Thermostat Housing Removal and Installation (R18Z1)

1141B6 1. Radiator Cap 1. Wait until the engine is cool, then carefully remove the radiator cap. ...

Honda Civic Service Manual: Thermostat Housing Removal and Installation (R18A9)

Thermostat

Thermostat Housing Removal and Installation (R18Z1)

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