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I just changed the thermostat on my 93 4.3 and the bolt is a metric size, unfortunately I don't remember what size it was, 12, 13, or 14 millimeter should cover it.

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โˆ™ 2006-04-08 16:59:47
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Q: What size bolt is it on the thermostat of a 1989 s10 blazer?
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