Parts for your 2013 Toyota Hilux-Thermostat

2013 Toyota Hilux Thermostat — Purpose, Service and Replacement

Technical sources confirm the 2013 Toyota Hilux is fitted with an engine coolant thermostat on all common engines of that year (1KD‑FTV 3.0 D‑4D, 2KD‑FTV 2.5 D‑4D, 2TR‑FE 2.7 petrol, and 1GR‑FE 4.0 V6). Toyota’s service manual (Cooling—Thermostat) and the Toyota Electronic Parts Catalogue (EPC) list the thermostat assembly and seal for these engines, and major aftermarket catalogues from Dayco and Gates also specify direct‑fit thermostats for the 2013 Hilux.

The thermostat’s job is simple but crucial: help the ute warm up quickly, then hold a steady engine temperature for best performance and economy. It stays shut when the engine’s cold so coolant circulates within the block, getting the temperature up fast. Once it reaches operating range (typically opening around the low‑80s °C for Hilux engines), the thermostat opens and meters flow to the radiator to keep things stable whether it’s idling in traffic, towing up a hill, or cruising the Hume. That stable temp also keeps the cabin heater effective and the ECU mapping happy, so it doesn’t over‑fuel or pull timing.

As part of regular servicing, it’s smart to keep an eye on thermostat health. Signs it’s on the way out include slow warm‑up, the temp gauge dropping on the highway (stuck open), overheating under load (stuck closed), surging temps, or a heater that never gets toasty. If the cooling system’s being refreshed, or the water pump/timing belt is due on a diesel, many techs use the opportunity to fit a new thermostat and seal—cheap insurance after 8–10 years or 150,000–200,000 kilometres.

• Use the correct coolant (Toyota Super Long Life Coolant, pink) and keep the mix right.
• On most Hilux engines the thermostat sits in the water inlet housing at the lower radiator hose on the engine block, replace the seal/O‑ring and clean the mating faces.
• Fit the thermostat in the correct orientation (jiggle pin/bleed hole at the top where applicable), torque the housing evenly, refill, and bleed with the heater on hot.
• After a test drive, check for leaks and confirm the gauge sits steady around the middle.

Handled properly, a quality thermostat helps the Hilux run sweet as—reliable temps, better fuel use, and less wear under the bonnet.

Where is the thermostat on a 2013 Hilux?

On the 1KD/2KD D‑4D diesels and most petrol variants, it’s in the water inlet housing on the engine block, where the lower radiator hose connects. Two or three fasteners hold the housing, replace the seal/O‑ring and refit with the bleed pin at 12 o’clock if present.

What temperature should the Hilux thermostat open at?

Toyota specs for 2013 Hilux engines call for an opening temperature in the low‑80s °C (often 80–84 °C), with the valve fully open by around the mid‑90s °C. On a healthy system, the gauge typically sits steady near the middle once warmed up.

Should the thermostat be replaced proactively?

It’s commonly replaced when doing a major coolant service, water pump, or (on diesels) timing belt work. After 8–10 years or 150,000–200,000 km, fitting a new OE‑quality thermostat and seal is inexpensive insurance against overheating or chronic over‑cooling.