Thermostat bolt size needed

1991 FORD RANGER
60,000 MILES • 2.3L • 4 CYL • 2WD • MANUAL
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RANGERDANGER65
  • MEMBER
  • 1 POST
I was changing my thermostat and I dropped a housing bolt and it bounced into a different dimension. What is the bolt size so I can replace it. The guys at O'reilly's acted like they have never heard of someone losing one.
Jun 14, 2021 at 1:06 PM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
These are not always the same size so the best thing to do is remove the other bolt and use that to compare the replacement. Otherwise, these bolts are readily available so I am not sure what the issue was with the parts store.

https://www.2carpros.com/articles/replace-thermostat

Below are a couple pictures of the different styles. Do either of these look like yours?

Let us know if you can get the other bolt out to compare with and what you find. Thanks
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Jun 15, 2021 at 11:58 AM
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