SUBARU Impreza WRX STi Engine thermostat replacement Cost
2003–2005 · Engine, Fuel & Emissions system
Typical range
$148–$255
Parts + labour
Labour hours
0.7–3h
At a typical garage
The thermostat regulates engine temperature by controlling coolant flow to the radiator. A stuck-closed thermostat causes overheating; a stuck-open one keeps the engine running cold, increasing wear and reducing heater output. SUBARU Impreza WRX STi thermostat replacement costs $148–$255.
What affects the price
- OEM vs aftermarket thermostat (OEM strongly recommended for reliability)
- Whether the housing and gasket are replaced too
- Coolant top-up cost after the job
Common questions
How long does this repair take?
Engine thermostat replacement on a SUBARU Impreza WRX STi typically takes 0.7–3 hours at a garage.
How often does this need to be done?
For a SUBARU Impreza WRX STi, this is typically needed thermostats are replaced on failure; typical lifespan is 80,000–100,000 miles.
Other engine, fuel & emissions system repairs on the SUBARU Impreza WRX STi
- ABS hydraulic unit replacement$340–$587
- ABS sensor replacement$140–$242
- ABS system bleeding$112–$193
- AC compressor clutch replacement$280–$483
- AC compressor replacement$300–$518
Engine thermostat replacement cost on similar cars
- OPEL Astra 5 Doors$148–$255
- VOLKSWAGEN Golf 5 Doors$148–$255
- MERCEDES BENZ A-Klasse$148–$255
- RENAULT Megane 5 Doors$148–$255
- FORD Focus 5 Doors$148–$255
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