I tried to look up that part but no one has a photo of it. You can look up the one for my car and see if it looks the same. You replace the whole housing and the t-stat is at a right angle to the opening (on mine anyway) so you might not see it. So if your hose attaches to a thing that is attached with 3 screws then that is probably it.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra