Parts for your 2018 Honda Cr-v-Thermostat

2018 Honda CR‑V Thermostat — What it does and how to look after it

Yes, the 2018 Honda CR‑V is fitted with a thermostat. Technical references that confirm this include Honda Service Information (2017–2019 CR‑V, Cooling System — Thermostat Removal/Installation) and the Honda Electronic Parts Catalogue (EPC) which lists a thermostat/thermostat assembly for the 2018 CR‑V with the 1.5‑litre VTEC Turbo (L15B7) offered in Australia and New Zealand. Independent workshop literature covering the 2017–2019 CR‑V range echoes the same.

In this CR‑V, the thermostat is the cooling system’s gatekeeper. When the engine is cold, it keeps coolant circulating mainly within the engine so it warms up quickly and runs efficiently. Once it reaches operating temperature, the thermostat opens to let coolant flow through the radiator, keeping things in the sweet spot for performance, economy and emissions. If it sticks shut, overheating can happen, if it sticks open, the engine can run too cool, causing high fuel use and weak cabin heat.

Good servicing habits go a long way. There’s no strict kilometre-based replacement interval from Honda for the thermostat, but it’s smart to assess it during coolant service and any time the cooling system’s opened. Many owners choose preventative replacement around major cooling work or beyond high mileage. Stick with Honda Genuine (or equivalent quality) parts and always fit a new O‑ring/seal.

• Tell‑tale signs it’s time to act: slow warm‑up, temperature gauge wandering, poor heater performance, cooling fans running a lot, or fault code P0128 (coolant temp below regulating range).
• Recommended coolant: Honda Genuine Type 2 (blue) premix. Top up/bleed only when the engine is cool and dispose of old coolant responsibly.
• Best practice when replacing: confirm the engine is cold, drain enough coolant to dip below the housing, swap the thermostat with the jiggle pin/vent in the correct orientation, torque fasteners to spec from the service manual, and bleed air with the heater on. Recheck levels after the first proper heat cycle.

Regular cooling system checks during servicing—hoses, clamps, water pump weep, radiator condition, and coolant age—help the thermostat do its job for the long haul. For most AU/NZ owners, following the vehicle’s maintenance schedule for coolant (typically long‑life intervals) and responding quickly to thermostat symptoms will keep the CR‑V running spot‑on.

Where is the thermostat on a 2018 Honda CR‑V?

It’s integrated in the water inlet/thermostat housing on the engine side of the cooling system. On the 1.5‑litre turbo, you’ll find it low and forward on the engine, where the lower radiator hose meets the housing.

What coolant should be used after replacing the thermostat?

Use Honda Genuine Type 2 blue premixed coolant (50/50). If that’s not available, use a high‑quality, silicate‑free coolant that meets Honda’s specifications. Don’t mix types, if in doubt, drain and refill with the correct coolant.

What are the common symptoms of a failing thermostat on a 2018 CR‑V?

Slow warm‑up, fluctuating temperature gauge, weak heater, overheating under load, or the check‑engine light with code P0128. Any of these warrant a cooling system check and likely thermostat replacement.