Re: L6 - 250 Overheating
Here is a link to a previous post about overheating 6's....
https://67-72chevytrucks.com/vboard/...d.php?t=706872
Most suggest moving the sensor to the thermostat housing....also, did you burp the heater core?
 
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2006 Chevy Silverado (Daily Driver)
2012 Chevy Equinox
 
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