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The thermostat is stuck open,

1) The thermostat could actually be one that is lower in temp (i.e. 185 deg instead of 192). 2) Temp gauge is inaccurate and shows to be cooler than is actually is.

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โˆ™ 2015-07-17 17:32:13
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Q: What would cause a 96 Ford F150 4.9 engine to run cool?
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