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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jun 2005 Posts: 86 New Guy | | New Guy Joined: Jun 2005 Posts: 86 | I have a 3100 with a 235 engine. It runs at 182 degrees even on a 100 degree day. Doesn't break a sweat. So, am I right that when I have to replace the t-stat, I should use a 180 degree thermostat? Any advantage in using a 160? | | | | | Joined: Jul 2001 Posts: 3,887 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Jul 2001 Posts: 3,887 | the thermostat just makes sure it doesn't run colder than whatever its value is, the rating is the temp it opens fully, a few degrees below that it will start to close - if your 235 is running around 180, that's a good thing, if you put a 160 in, it would prolly run about 160, in my experience they tend to run cold if they can
Bill | | | | | Joined: Apr 2005 Posts: 1,107 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 1,107 | i like to run 160-170 in mine even with new rebuilt engines and recored radiators. for those that have been to my place you know getting to it takes some grunt. on hot days with a load on the truck it can raise the temp to a region i dont care to see. recoring has helped tremendously. | | | | | Joined: Jan 2003 Posts: 354 'Bolter | | 'Bolter Joined: Jan 2003 Posts: 354 | Tim, are you sure? The way I read the specs - "fully open at 176 deg F" is a 180 thermostat.
Harold Wilson
41 Chevy 3/4 Ton
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