GM Thermostat Variance

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Brett365
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GM Thermostat Variance

Post by Brett365 »

2017 Silverado HC 1500
6.2L 8L90
Is there a tuning option to tell the ECM, what temperature thermostat is installed in the cooling system?
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06MonteSS
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Re: GM Thermostat Variance

Post by 06MonteSS »

No... the stock t-stat on those trucks is 207*.... and the preset tunes make changes to the fan settings based on the stock t-stat...

fan power can not be adjusted for anything lower than 192* anyway, so if you change the t-stat, I would not go any lower than a 194* t-stat... otherwise, a colder t-stat, will not allow the engine to get up to its normal operating temps... and doesn't gain you anything anyway...
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Brett365
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Joined: Sat Aug 08, 2026 11:05 am

Re: GM Thermostat Variance

Post by Brett365 »

Thank you!
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