Engine Thermostat/Temperature
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Senior User
Joined: Feb 2008
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Engine Thermostat/Temperature
I just made the trip up north with the truck for the first time and am having an issue with the heater working. First of all its an aftermarket heater in the truck. The thing would not get very hot so I started poking around with under the hood and noticed that the motor and hoses were not getting very hot. I could place my hand on the motor and hoses and not get burnt, which seems like it is too cool to me even though it was 10-15* outside. Sounds to me like a thermostat issue if the truck is not getting up to temp. I plan to install an aftermarket temp gauge, but thought I'd get your guy's thoughts first
Senior User
Joined: May 2010
Posts: 337
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From: Des Moines
Sounds like you have a t-stat stuck open. Make sure you get the proper one from either Ford or IH dealership. DON'T GO to NAPA or some other parts store. They, as I understand it, require a special one.
Fleet Mechanic
Joined: Nov 2010
Posts: 1,347
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From: Kville, ohio
try a peice of cardbord infront of the rad. i was haveing troubles after i replaced my rad and Tstat. the new rad cooled so much better cause it wasnt full of scale like the olf one, i had to truow some cardbord in front and now it warms up to temp.
Logistics Pro
Joined: Sep 2010
Posts: 4,411
Likes: 4
From: Victor, MT
O'Reilly sells OEM thermostats, they are the only people i will go to other than the dealership or IH/NS. O'reilly had my starter for my 6.9, new gp, injectors and all the like. At any rate. They sell all OEM stuff. I would invest in a 195 thermostat. That will warm you up and out of the truck when working right.
Cargo Master
Joined: Mar 2010
Posts: 2,227
Likes: 149
From: Higginsville, MO
MOTORCRAFT (FORD) THERMOSTATS:
Thermostats - 1994 Ford F-250 | O'Reilly Auto Parts
sold by oreilly you have to call in for price on most of there motorcraft products.
Thermostats - 1994 Ford F-250 | O'Reilly Auto Parts
sold by oreilly you have to call in for price on most of there motorcraft products.
Fleet Owner
Joined: Jul 2006
Posts: 20,375
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From: Mi'kma'ki
Originally the IDI diesel came with a 4 row HD brass rad....... I don't understand why they are selling aluminums as replacement.....
Diesel engine coolant temperature at the top of the radiator where hose attaches after high rpm or under load condition for 20 minutes should be (195-237*F) 91-114*C nice time to have a temperature reading point and shoot tool.
Did the PO replace the thermostat too, overheating could mean the wrong one installed....... need a Ford or IH Tstat only.
CAUTION:
The specified/required thermostat does not contain an internal bypass, since the bypass is located in the cylinder block. Whenever the thermostat is replaced, it is mandatory that only Motorcraft E5TZ-8575-C or Navistar 1807974C94 thermostat be installed.
Diesel engine coolant temperature at the top of the radiator where hose attaches after high rpm or under load condition for 20 minutes should be (195-237*F) 91-114*C nice time to have a temperature reading point and shoot tool.
Did the PO replace the thermostat too, overheating could mean the wrong one installed....... need a Ford or IH Tstat only.
CAUTION:
The specified/required thermostat does not contain an internal bypass, since the bypass is located in the cylinder block. Whenever the thermostat is replaced, it is mandatory that only Motorcraft E5TZ-8575-C or Navistar 1807974C94 thermostat be installed.
Navistar 1807974C94 = 180* fully open = 200* (best for running cooler should you find the need for your application.)
in case its time for a couple radiator hoses,cap and flush:
http://www.oilburners.net/articles/cavitationartic.html
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Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
I usually plow with my defrost on high and the drivers side window down at temps down to 10 degrees.
That keeps my windows from fogging up from all the snow I track in the cab as it melts.
That keeps my windows from fogging up from all the snow I track in the cab as it melts.
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Senior User
Joined: Feb 2008
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I have no idea if the PO did anything with the t-stat. I ordered a new one from Ford today and hopefully will be able to get it in there tomorrow. The truck defiantly was not getting anywhere near 195*, like I said I could hold my hand on the motor and hoses and it was pretty cool. Im gonna add a cover for the front grill as well, did that for my dads powerstroke and it made a big difference
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
If you are not working the engine, a diesel does not make much heat.
So the upper radiator hose may not be that warm.
The lower radiator hose will be much cooler, even in the summer.
The heater hoses however should be rather warm after a mile or so driving down the highway.
So the upper radiator hose may not be that warm.
The lower radiator hose will be much cooler, even in the summer.
The heater hoses however should be rather warm after a mile or so driving down the highway.
Posting Guru
Joined: Oct 2005
Posts: 2,282
Likes: 4
From: Oregon
O'Reilly sells OEM thermostats, they are the only people i will go to other than the dealership or IH/NS. O'reilly had my starter for my 6.9, new gp, injectors and all the like. At any rate. They sell all OEM stuff. I would invest in a 195 thermostat. That will warm you up and out of the truck when working right.
Cargo Master
Joined: Mar 2010
Posts: 2,227
Likes: 149
From: Higginsville, MO
I installed a Kragen T-Stat after doing my head gaskets to get my truck back on the road even after reading that all the aftermarket stuff was garbage. There was a waste of time and money swapping out for a overpriced dealership one if this actually is the case...
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