Parts for your 2010 Mazda Cx-9-Thermostat

2010 Mazda CX-9 Thermostat — What It Does and When to Replace It

Technical sources confirm the 2010 Mazda CX‑9 is fitted with a thermostat. The Mazda Workshop Manual for the 2010 CX‑9 (Cooling System sections), the Mazda Electronic Parts Catalogue for the MZI 3.7‑litre V6, and Ford/Mazda service literature for the Cyclone/MZI 3.7 V6 all specify a wax‑type thermostat and a dedicated housing at the engine end of the radiator hose. So yes, this model absolutely uses a thermostat as part of its cooling system.

The thermostat’s job is to help the engine reach and hold the sweet‑spot operating temperature. When the engine’s cold, it stays shut, keeping coolant in the block so things warm up quickly. Once it hits its set temp, it opens to circulate coolant through the radiator, keeping temperatures steady. That means better fuel economy, smoother running, and less engine wear — exactly what owners in Australia and New Zealand want for long‑haul reliability.

On the 2010 CX‑9’s 3.7‑litre V6, the thermostat sits in a housing where the radiator hose meets the engine. It’s a serviceable part and not considered a routine replacement item