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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 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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Quote:
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
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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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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
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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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Old Sat, September 25th, 2010, 02:54 PM
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I cant seem to find a replacement thermostat that goes higher than the factory one, lots of options for cooler ones though. It is starting to get cooler up here in the great white north so maybe a winter front is the answer not a different thermostat. But it would be a pain to have to install and remove it every year. Does anyone know how to modify a thermostat to run hotter. I've read a few ways to make them open at a cooler temp but it seems like no one else is interested in increasing coolant temp. As for the wiring on the Flexalite fan the only problem I encountered was attaching the wire to the a/c control circuit. It was simple in theory but in such an awkward spot it was almost impossible to get my hands in a position to make the connection. If the FF Dynamics fan that bigterp is considering has a feature where it activates when the a/c compressor is engaged the same issue is likely. Other than that the only other issue I had with the install was moving that bake controller but that was pretty easy. Maybe the FF Dynamics will be a different shape and avoid that problem though.
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Old Sat, September 25th, 2010, 04:31 PM
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I guess my question is which reading are you going off of? if you use the Cylinder head temp it will be more accurate on the exact temp because it has a sensor, but the other setting, ECT i think is what it shows, is derived from the CHT. so you might be getting what you want without realizing it
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