Engine Coolant Thermostat Housing for Toyota Hiace 1998-2004 5L

Replace the cracked or leaking thermostat housing on your 1998–2004 Toyota Hiace equipped with the 5L engine with a precision-machined aluminum direct-fit unit designed to restore stable coolant flow and prevent overheating.

When the original thermostat housing degrades, it frequently causes slow heat regulation, coolant seepage around the flange, and recurring engine temperature spikes driven by the 5L diesel series. This exact replacement restores factory coolant routing while maintaining tight pressure control through its hermetically sealed design and calibrated thermal response. The compact 184 gram casting copies the OEM mounting points and internal passage geometry, simplifying swap procedures without adapter plates or modified hosing.

Benefits & Tips

• Clean the cylinder head mating surface with a dedicated gasket scraper to guarantee an even seal and rule out bolt cross-threading during reassembly.
• Always photograph or physically compare your factory unit’s molded code before ordering. Even a single digit difference on the 16331 series indicates a completely different bypass hole arrangement.
• Air pockets trapped in the cooling circuit delay thermostat activation. Cycle the engine with the radiator cap off after refill and monitor the temperature gauge until the needle holds steady at normal operating range.

Product Specifications

• Fits: Toyota Hiace 5L engine, model years 1998–2004
• Direct Replacement Part Number: 1633154112 / 16331-54112
• Housing Material: Precision cast aluminum
• Mount Location: Lower thermostat assembly
• Unit Weight: 184 g

Package Includes

• One (1) Engine Coolant Thermostat Housing Assembly

Important Warnings For Installation

Reference guides assist with general orientation only. Verify that the stamped marking on your existing component matches 1633154112 precisely. Installing a mismatched housing will interrupt coolant circulation through the 5L block and likely trigger catastrophic overheating. Reuse only manufacturer-approved gaskets or apply OEM-grade silicone per service manual torque values.

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