ScanGauge Temp Reading (1 Viewer)

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That's some good investigative work! You could also just monitor the reservoir instead of taking the heater core out of the loop if you have parts on the way.

I can confirm that my 07 runs "hotter" than the earlier trucks. 192-197 is really common in mixed driving. I only see it hit 201 if I'm sitting at a light in gear in 100+ weather with the a/c cranking away. Even then, it will hold that 201 or dip down into the mid 190s while sitting as the fan clutch / thermostat do their job.
 
My 06' is pretty stable. I typically see 186-188* during most driving and weather conditions. A couple degrees cooler in colder weather and a couple degrees warmer in the peak summer weather.
 

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