Running warmer - Hummer Forums - Enthusiast Forum for Hummer Owners


Hummer H3 For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine.

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Old 06-18-2017, 01:47 PM
hummin along's Avatar
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Default Running warmer

2008 Alpha
Changed thermostat, runs no cooler.
Are any mods available for any aftermarket cooling kit?
Thanks for any help
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Old 06-19-2017, 09:02 AM
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The dash temp gauge is basically useless, more of an idiot light with a needle. Yours might say 3/4, mine might say 1/2, the actual temp could be cooler in yours than mine. You need to scan through the OBDII to read actual temp. My replacement T Stat keeps coolant temp at 193-195F, right were it is supposed to be.

I do have a CSF aluminum radiator, runs the same temp as my old OEM did just doesn't build much above that on hot humid days in stop & go.

Anything 3/4 or below is normal and designed to run that way.
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Old 06-19-2017, 08:33 PM
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Thank you
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