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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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  #1  
Old Mon, September 20th, 2010, 09:39 PM
jmwilso2 jmwilso2 is offline
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I had the same issue with mine. It was running way too cool. I have since adjusted it up by sitting parked and reving the engine up a bit and then setting the fan to kick in at 210 F but the coolant temp reading on my gryphon still seldom goes over 195 just from ram air flowing through the rad. I'm thinking I should maybe put in a different thermostat valve to get the temp up into the 200s.
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Old Tue, September 21st, 2010, 08:40 AM
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Quote:
Originally Posted by jmwilso2 View Post
I had the same issue with mine. It was running way too cool. I have since adjusted it up by sitting parked and reving the engine up a bit and then setting the fan to kick in at 210 F but the coolant temp reading on my gryphon still seldom goes over 195 just from ram air flowing through the rad. I'm thinking I should maybe put in a different thermostat valve to get the temp up into the 200s.
That sounds like the best way to accomplish your goal. I may be way off here, but when researching the crap out of efans I though I read that the stock thermostat (on the 5.4L Tritons) is at like 190 degrees. If that is the case I would think that Ford found this to be the best operating temperature for our 5.4's and is probably best left that way. Is it benefical and/or safe to try and increase the operating temps of our trucks?? Again, I may be totally wrong here so please don't shoot me!!!!
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Old Tue, September 21st, 2010, 08:46 AM
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Longshot270 Longshot270 is offline
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Not all trucks have the fans click on at 190. Most people see 195 but I know that Jack's truck runs at 205 regularly. Slightly warmer temperatures will help combustion efficiency but oil starts breaking down around 250. I would not try increasing the temperature above 210.
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Old Tue, September 21st, 2010, 10:11 AM
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Originally Posted by Longshot270 View Post
Not all trucks have the fans click on at 190. Most people see 195 but I know that Jack's truck runs at 205 regularly. Slightly warmer temperatures will help combustion efficiency but oil starts breaking down around 250. I would not try increasing the temperature above 210.
I was referring to the water thermostat, not the fan. But I get what your saying. What would you guys say is the "optimal" running temp????
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Old Wed, September 22nd, 2010, 02:59 AM
cajunboy2208 cajunboy2208 is offline
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Mine has never went above 200.
It normally runs between 194-196 no matter how much I run it...
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Old Wed, September 22nd, 2010, 09:23 AM
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Originally Posted by cajunboy2208 View Post
Mine has never went above 200.
It normally runs between 194-196 no matter how much I run it...
Is that with e-fans?? What other mods do you have??
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Old Wed, September 22nd, 2010, 02:54 PM
cajunboy2208 cajunboy2208 is offline
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That is with the factory fans.
I have K&N CAI, Borla exhaust, and custom tuned Gryphon.
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