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2004 to 2008 F-150 and Mark-LT
4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs.


 
 
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Old Mon, October 11th, 2010, 09:17 PM
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Jackpine Jackpine is offline
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I'm fairly certain the stock thermostat is a 195 degree one. I personally would not use one colder than that. The engines are designed to operate in the low 200 degree region, and yes, when I'm just driving my truck on the highway in our "fall" temperatures in the high 80s, the CHT tends to stabilize around 205 degrees.

- Jack
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