Thermostat. What temp to use? - Ford Powerstroke Diesel Forum
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Old 02-09-2014, 07:11 AM
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Thermostat. What temp to use?

Recently my truck has been running a little cooler than normal. And no - not just because of the COLD east coast temps. Was a balmy 30 the other day and the gauge was low. Heat takes a little longer to warm up as well. Any suggestions of what temp thermostat I should replace it with? The current one was done by my mechanic a while ago when my water pump crapped the bed a few winters ago. Truck is basically stock with no crazy mods. Still runs fine at 377k. Any input is appreciated.
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Old 02-09-2014, 08:47 AM
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These engines where designed to use a 203* t-stat. http://www.dieselsite.com/dieselsite203thermostat.aspx
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Old 02-09-2014, 11:39 AM
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im running a 190*,heats great in the winter months pulls cool in the summer!
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Old 02-09-2014, 12:50 PM
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I put a 203 in and my mpg's and power have made a great improvement with it.
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Old 02-10-2014, 07:18 AM
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I put in a 203* and I do not like it. I did not see any improved power or millage and I have found that now when I am towing 12K in the heat the truck runs too hot for my liking. I can hit 230 - 240 easy pulling a long hill even with my cooling mods. Never had that problem with the 190*. I think the 203 is fine for a DD or a truck that pulls light loads but be aware if you pull heavy in the mountains like I do. I am not saying that it is a bad thing or that it is a bad product. I think it was a quality piece it just didn't work for me. Others have had it work better for them. But, I will be switching back to a 190* once it warms up here.
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Old 02-10-2014, 08:19 AM
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Quote:
Originally Posted by ChallengerRV View Post
I put in a 203* and I do not like it. I did not see any improved power or millage and I have found that now when I am towing 12K in the heat the truck runs too hot for my liking. I can hit 230 - 240 easy pulling a long hill even with my cooling mods. Never had that problem with the 190*. I think the 203 is fine for a DD or a truck that pulls light loads but be aware if you pull heavy in the mountains like I do. I am not saying that it is a bad thing or that it is a bad product. I think it was a quality piece it just didn't work for me. Others have had it work better for them. But, I will be switching back to a 190* once it warms up here.
I tow 15k plus in elevations from 1000-10,000 ft on grades up to12%. Try a 6.0 fan, it works very well.
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Old 02-10-2014, 09:02 AM
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I do have a 6.0 fan. Looking at 1Dieselman's mods list compared to mine the big difference is he has injectors and DP tunes. I am running stock injectors with no tune. Maybe that is the reason I run hotter then he does.
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Old 02-10-2014, 09:07 AM
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I give you credit for towing that much without tunes. I don't know what I would do without tunes, it's nice going from a regular tow tune to a heavy tow tune when I need it.

Mine stayed just fine on the temp when towing around 8k. But then i'm not towing a load like you guys.
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Old 02-10-2014, 09:16 AM
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It does take a long time to get to where I am going

Stage 2 injectors and DP tunes come next month. Just before RV season. I can't wait.
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Old 02-10-2014, 09:47 AM
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Quote:
Originally Posted by ChallengerRV View Post
I do have a 6.0 fan. Looking at 1Dieselman's mods list compared to mine the big difference is he has injectors and DP tunes. I am running stock injectors with no tune. Maybe that is the reason I run hotter then he does.
It's got to be tough towing with no tune's. Keep in mind that more fuel creates more internal heat.
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