Hi J, Let's be sure of a couple of things first-off.
1) are you seeing smoke (from burning oil) or steam (from a possible coolant leak) near the thermo, which contains coolant?
and
2) are you sure the condition isn't happening all the time, and when on "long trips," which I assume you mean, while driving faster on the freeway, and when in slower traffic, you can see it because there's not as much air flowing in the engine area due to lower vehicle speed? Do you see any coolant residue around the thermo, which could indicate a leak?
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