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2002 Lexus ES 300 Thermostat & Water Inlet Exploded Parts Diagram (16331A)

Exploded parts diagram of an engine coolant water outlet and hose assembly with part numbers

Exploded parts breakdown of a cooling-system water outlet, gaskets, hoses and fasteners with numbered part callouts.

AI caption · Photo 16 of 16

This is an exploded parts diagram (Toyota/Lexus electronic parts catalog style) showing the engine cooling system water inlet/outlet and thermostat area. The illustration depicts the water inlet housing, thermostat (callout 16331A, circled in red to highlight the part of interest), thermostat gasket/seal (16325), water inlet (16321), water bypass pipe components (16322, 16322A), water outlet housing (16323), and associated hoses (16264, 16264A, 16267, 16267A NO.1 and NO.2) and small parts (16261G, 16261H). Fastener part numbers are called out, including bolts/studs 90179-06080 (qty 2, in two locations), 91511-B0616 (qty 8), 90116-06070 (qty 3), 92122-60612, and 91621-J0814. Cross-references direct the reader to FIG 22-11 (PNC 22210, the throttle body area), FIG 17-01 (PNC 17111, intake manifold), and ILLUST NO. 1 OF 2 for adjoining assemblies. A reader can use this diagram to identify the thermostat's location in the assembly, the surrounding gaskets, housings, hoses, and the exact fastener part numbers and quantities needed when replacing the thermostat or water inlet components. No year, model, or engine designation is printed on the scan itself.

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Frequently asked questions

Which callout number identifies the thermostat in this diagram?
The thermostat is callout 16331A, which is highlighted/circled in red on the diagram, positioned between the seal/gasket (16325) and the water inlet housing (16321).
What bolts hold the water inlet housing and related parts in this diagram?
Fasteners shown include 92122-60612 at the water inlet, 90116-06070 (qty 3), 91621-J0814, 90179-06080 (qty 2, shown in two places), and 91511-B0616 (qty 8).
What hose callouts are shown in the diagram?
Hoses/clamps are called out as 16264 with 16264A (two locations), 16267 with 16267A (NO. 1) and 16267A (NO. 2), plus a large lower hose referenced to ILLUST NO. 1 OF 2.
What other figures does this diagram reference?
It references FIG 22-11 (PNC 22210), FIG 17-01 (PNC 17111), and ILLUST NO. 1 OF 2 for adjoining components.
What parts sit between the thermostat and the engine in this exploded view?
The exploded view shows the thermostat (16331A) with a seal/gasket (16325) on one side and the water inlet housing (16321) on the other, with bypass pipe parts 16322 and 16322A below.

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