203 degree Thermostat - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 35 (permalink) Old 09-18-2008, 03:45 AM Thread Starter
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203 degree Thermostat

I recently had a leak coming from my water pump where the housing seals to the thermostat, so I decided to take it apart and see what the problem was. Long story made short I ended up cracking my water pump due to a froze bolt. Since I have to replace the pump now I was wondering. Is the 203 degree thermostat worth putting on the truck, and a new billet housing?

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post #2 of 35 (permalink) Old 09-18-2008, 03:49 AM
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Re: 203 degree Thermostat

You dont need it, and it doesnt really make a noticeable difference. It's not easily seen either. I guess you call it one of those mods that just sounds cool. Billet this, billet that... In theory it works, and may help engine efficiency a smidgen.

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post #3 of 35 (permalink) Old 09-18-2008, 03:52 AM Thread Starter
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Re: 203 degree Thermostat

Well I read that if I removed my thermostat housing which I have to to replace my water pump, that it won't seal. Is this true or is this them trying to sell a product?

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post #4 of 35 (permalink) Old 09-18-2008, 03:59 AM
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Re: 203 degree Thermostat

Yes, the billet housing is much nicer than the OEM sheetmetal one. However the OEM replacement is like 15.00 at the dealer. The 203* will help trucks that run unloaded most of the time, it will do nothing for a loaded truck and may actually cause the fan to run more often slightly. It just depends on how you drive and what you use your truck for.

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post #5 of 35 (permalink) Old 09-18-2008, 04:15 AM Thread Starter
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Re: 203 degree Thermostat

so I am guessing the dealer housing and a gasket should do the job huh. No need for me to spend money on anything that wont really help me out that much

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post #6 of 35 (permalink) Old 09-18-2008, 05:10 AM
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Re: 203 degree Thermostat

I'd like to verify too. I just got the billet housing and thermostat. A o-ring came with the thermostat. No gasket came with the billet. Am I supposed to get a new gasket for the billet housing?

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post #7 of 35 (permalink) Old 09-18-2008, 06:55 AM
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Re: 203 degree Thermostat

I used some blue rtv because it leak with just the o-ring.BTW the 203 stat did nothing for me,couldent tell the difference from stock.

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post #8 of 35 (permalink) Old 09-18-2008, 08:01 AM
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Re: 203 degree Thermostat

same here 203 had no noticed difference on the performance of jizzy.Heater is seriously hot in the winter though.


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post #9 of 35 (permalink) Old 09-19-2008, 04:59 AM
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Re: 203 degree Thermostat

I didnt notice any difference on day to day driving with the 203, however, when towing, I notice the engine fan comes on alot more then it used to. Makes me want to pull it back out, and go back to the stocker. But it doesnt leak now, and it has final charge antifreeze in it. So Id rather not mess with it, unless I get really, really bored.

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post #10 of 35 (permalink) Old 09-19-2008, 05:33 AM
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Re: 203 degree Thermostat

I believe International puts the 203ºF thermostat in the T444E. I don't know if the cooling system is any different between Ford and International.

But I have heard diesel mechanics say that a hotter diesel engine is better. Something about burning more of the soot out and keeping the engine cleaner. Maybe it's kinda like cooking the crud off the BBQ grill, or using a self-cleaning oven. Or maybe it was more about a hotter engine that makes it more efficient at creating a better combustion.
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