Honda Civic. Manual — part 378

THERMOSTAT HOUSING REMOVAL AND INSTALLATION

REMOVAL

1. Drain the engine coolant, refer to the THERMOSTAT REPLACEMENT .
2. Remove the air cleaner housing assembly, refer to the AIR CLEANER

REMOVAL/INSTALLATION .

3. Remove the harness bracket (A), and cover the air fuel ratio (A/F) sensor

connector and secondary heated oxygen sensor (secondary HO2S) connector
with a tape to protect the connectors from engine coolant, then remove the
lower radiator hose (B), the water bypass hoses (C), and the heater hose (D).

Fig. 2: Identifying Harness Bracket, Radiator Hose, Water Bypass Hoses
And Heater Hose

4. Remove the thermostat housing.

2008 Honda Civic GX

2006-08 ENGINE Cooling System - Civic GX

Fig. 3: Identifying Thermostat Housing With Bolts

5. Remove the exhaust gas recirculation (EGR) plate (A), thermostat cover (B),

and thermostat (C).

Fig. 4: Identifying Exhaust Gas Recirculation (EGR) Plate, Thermostat
Cover And Thermostat

INSTALLATION

1. Install the new rubber seal (A) onto the thermostat, then install the thermostat

(B) with pin (C) up, and install the thermostat cover (D).

2008 Honda Civic GX

2006-08 ENGINE Cooling System - Civic GX

Fig. 5: Identifying Rubber Seal, Thermostat, Pin And Thermostat Cover

2. Install the EGR plate (E) with a new gasket (F).
3. Install the thermostat housing (A), using a new gasket (B) and new O-ring (C).

Fig. 6: Identifying Thermostat Housing, Gasket And O-Ring

4. Install the lower radiator hose (A), heater hose (B), and water bypass hoses

(C), then install the harness bracket (D).

2008 Honda Civic GX

2006-08 ENGINE Cooling System - Civic GX

Fig. 7: Identifying Lower Radiator Hose, Heater Hose And Water Bypass
Hoses

5. Install the air cleaner housing assembly, refer to the AIR CLEANER

REMOVAL/INSTALLATION .

6. Refill the radiator with engine coolant, and bleed the air from the cooling

system with the heater valve open, refer to the COOLANT
REPLACEMENT .

FUEL PRESSURE REGULATOR THERMOSTAT REPLACEMENT

1. Remove the cowl panel and under-cowl cover, refer to the COWL COVER

REPLACEMENT .

2. Remove the water bypass hoses (A) from the fuel pressure regulator

thermostat, then plug the hoses.

2008 Honda Civic GX

2006-08 ENGINE Cooling System - Civic GX