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Aisin Thermostat

2142 Views 22 Replies 8 Participants Last post by  DrD123
If you ever wondered about the quality. I figured if the make great water pumps, I should be confident that they would not cheap out on a thermostat with their name on it.
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Back in ’20 I bit the bullet and bought the $45 OEM thermostat versus $12 Gates. The OEM has a different build quality from the generic thermostat and I didn’t want any issues.
Ok, as promised, I’d report back with my experience with the Aisin thermostat THH-017.
The installation was not without a hitch. Although after a trip to a local auto parts store for the correct gasket, the thermostat is working great. So my advice is, if you buy the Aisin thermostat, be sure and research the gasket needed for your vehicle.
I was sent this….
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I needed this…..
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Good to know, but dang, when I replaced my radiator in 2019 I think it was, I don't recall the Aisin being on Rockauto; otherwise, I would surely have gotten it, along with the hoses, instead of the Gates thermostat I went with.

So far, OK, but I shudder to think how much more my days are counted with the Gates and their declining quality in recent years.

Wow, I could have had an Aisin.
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Discussion Starter · #22 ·
Good to know, but dang, when I replaced my radiator in 2019 I think it was, I don't recall the Aisin being on Rockauto; otherwise, I would surely have gotten it, along with the hoses, instead of the Gates thermostat I went with.

So far, OK, but I shudder to think how much more my days are counted with the Gates and their declining quality in recent years.

Wow, I could have had an Aisin. View attachment 160957
Not to rub it in or anything but ya, there is obvious difference between OEM/Aisin versus Gates.
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[Gates^]
A stuck thermostat will usually cause an engine code. Hopefully it would be detected before the hoses swell.
 
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I replaced the thermostat in the 05 we got this summer using the Aisin THH-017 as well - same experience with the gasket. I did this when I replaced the timing belt and had everything apart when I ran into the incorrect gasket issue. The original one was still in good shape, so I just transferred the old gasket over to the new thermostat and ran with it - seems to be doing just fine (no leaks).
 
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