180 stat - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-28-2003, 04:40 PM   #1
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Question on changing to a 180 thermostat. Will it effect my fuel economy? A guy at the parts shop said it could change fuel consumption with the engine running at a cooler temp. Is this or does he have a point?

I'll probably switch anyway because my intake plenum cracked last Oct. and that was a pain to deal with.
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Old 02-28-2003, 05:02 PM   #2
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Mine didn't affect my mileage a bit, and I even drilled bypass holes in it. Thousands of GP'* and Bonnevilles will back this up. Your engine won't run 15 degees cooler as you might expect, but it will run cooler. Keep that trans cooler in mind too.
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Old 02-28-2003, 05:23 PM   #3
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Great! Thanks for the input. My trans cooler is on the way too
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