Thermostat Housing: Removal and Installation

Thermostat Housing: Removal and Installation

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spilling.

Removal

1) Remove water pump. Refer to [Thermostat: Removal and Installation] Removal and Installation.
2) Remove thermostat. Refer to Thermostat.
3) Remove the radiator hose (upper) from the radiator.
4) Remove exhaust manifold cover. Refer to [Exhaust Manifold and Three Way Catalyst: Exploded View [QR25DE] Exhaust Manifold and Three Way Catalyst Exploded View ].
5) Remove oil level gauge and oil level gauge guide. Refer to [Engine Unit: Exploded View] Exploded View.

CAUTION:
Plug the oil level gauge guide opening to prevent foreign materials from entering oil pan.

6) Remove A/C compressor (if equipped) without disconnecting the A/C hoses and position aside. Refer to [Compressor: Removal and Installation] Removal and Installation.
7) Disconnect electric throttle control actuator, oil cooler and heater hose from heater pipe.
8) Remove bolt for heater pipe at water pump and thermostat housing.
9) Disconnect heater pipe from water pump and thermostat housing.
10) Remove water pump and thermostat housing.

CAUTION:
- Do not reuse O-ring.
- Do not reuse gasket.

Installation

Installation is in the reverse order of removal.

- Apply a mild soap to O-ring before inserting heater pipe end into water pump and thermostat housing. Then insert it immediately.

CAUTION:
Do not reuse O-ring.

Inspection after Installation

- Check for engine coolant leaks. Refer to [Engine Coolant: System Inspection] Initial Inspection and Diagnostic Overview.
- Start and warm up the engine. Visually check for engine coolant leaks. Repair as necessary.