New t-stat and overheat - Ford Powerstroke Diesel Forum
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Old 12-08-2013, 05:32 AM
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New t-stat and overheat

I folks, since its cold here the temperature wasnt going up ( needle wasnt reaching the N on the gauge ). So I bought a motorcraft t-stat and had a little trouble. My t-stat housing was worn so coolant went all out by there. Changed the housing with a brand new motorcraft. I filled up the coolant everywhere I could, in the block ( where the t -stat sits ), unpluged the 2 heater hoses and fill em up. Fill the rad. Even do the air removal with a suction tool.

The problem now its the temp raise to past the L on gauge. Near the line before the red space. I do know that the t-stat IS opening because the hose upon it is damn hot ! The high of the rad too. Ive been looking at this since 3 weeks and cant find why ? Can someone help me
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Old 12-28-2013, 09:23 PM
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Is the thermostat installed correctly? 50/50 coolant water mix?
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Old 12-28-2013, 09:27 PM
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Tstat correct yes. The mix im not sure.. but for now the gage is fuc ed up. Ill have to test it
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Old 12-29-2013, 06:12 AM
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i would go to an auto parts store and get a mechanical temp gauge and see what the temp really is. The temp gauge on these trucks are idiot gauges, theres only 5 positions the needle can point to. it raises x amount of degrees it moves up one position, its raises another x degrees its moves another position, they dont work like a traditional gauge. You sender might be bad too. Or you could have go a bad thermostat from the factory
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Old 12-29-2013, 06:32 AM
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Are you sure that you have the correct thermostat? There where two different lengths of thermostats offered dependent to what year your engine is. If you have a 96-97 engine and install a 94-95 thermostat the engine will overheat. Read here http://www.dieselsite.com/dieselsite203thermostat.aspx for a little more info.
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Old 12-29-2013, 07:30 AM
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I would bet your thermostat is in backwards
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Old 12-29-2013, 08:04 AM
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Thank you all for all the info ! Didnt knew for the lenght of tstat.. I have a 95 and pretty sur I have the good one. I ordered it from ford dealer and it fits very well. At first the gave me the wrong one ( the diameter was too small ).

Im sure it isnt backward because the upper hose of the rad is hot so coolant is going thru there. I have to check with mecanichal gauge.

Thank you ill give feedback when it will be done
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Old 12-29-2013, 10:06 AM
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Quote:
Originally Posted by LSSBoy View Post
Thank you all for all the info ! Didnt knew for the lenght of tstat.. I have a 95 and pretty sur I have the good one. I ordered it from ford dealer and it fits very well. At first the gave me the wrong one ( the diameter was too small ).

Im sure it isnt backward because the upper hose of the rad is hot so coolant is going thru there. I have to check with mecanichal gauge.

Thank you ill give feedback when it will be done
Another thought would be if someone changed out the water pump and installed a 96-97 pump meaning your 95 thermostat would be the wrong one. Also what condition is the lower radiator hose, it could be sucking shut if in bad condition.
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Old 12-29-2013, 11:19 AM
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The hose is in good shape and have a spring in it. Everything seems fine. Im 90% sure when i will check it with a good thermometer it will be ok
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