I have a 06 with 35k on the clock eot is 199-197 ect is 186-184 running 60 on cruse with 5-40 synthic oil 600 miles on it and elc coolant and filter with 4000 miles on it at 0 to-5 degrees with winter grill cover on truck is clean no oasis work or any aftermarket stuff bought it with 30k 3 months ago are the numbers bad or good ?

 

You need a new t-stat

Josh

 

A motorcraft one or any company?

 

The Ford T-stat is what most run, despite it running cold again soon - for some.
With the Winter Front AND your very cold air temps - it's sort of hard to tell how those would effect your actual temps..

Hard to believe you only have 35k miles - you need to drive it more..

After sitting a day or so, before starting the engine - compare your ECT, EOT and TFT to verify your sensors are close to each other - and the outside air temp, before you decide to do anything - sometimes, the sensors are OFF and you replace parts with no effect..

 

Normal ams not plugged in there same or with in 2 degrees what brand is preferred then? and I just got the truck from Texas it a one owner Amarillo crew 4x4 had 30 k when I bought it was purchased in 06 so didn't sit long on lot lol

 

Highest I have seen temps was 211 eot and 197 coolant that was pulling track loader in September doing 70 (deck over tilt bed trailer and Deere ct322) that was old oil too

 

There is an on-going thread about the Mishimoto 200 degree t-stat, it looked promising at keeping the temps up, but now a number of folks are having issues with fitment and/or temps falling even lower.. so there is no 100% clear winner. The Ford t-stat is cheaper and known to fit/work, but with your outdoor temps, you might do all the work and find nothing changed.. If you have a nice heated garage to work in, it might be worth swapping in a new Ford OEM.. otherwise, for 4 degrees I'd just deal with it until it's warmer outside.

 

Ok yeah have heated shop to do but if not a bad deal I will wait just didn't want something serious starting to go wrong have a trip 2600 miles in 7 weeks towing 4 place enclosed trailer west and back and want to fix If was serious before we left

 

Sean is using a international t stat and hasn't had an issue.....I'd try that

 

Do u have the part number at all

 

Oem part # 8575

Not sure on the international.

I'd stay away from mishimoto as some are not fitting in the housing ... like mine