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Old 03-22-2008, 07:29 AM
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203*thermostat

My truck seems to take alot longer to warm up now after the install of the 203 thrmostat and coolant filter. This might sound dumb but does new coolant cool that much better or is this thermostat stuck open?
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Old 03-22-2008, 07:44 AM
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My warm up time is same, even below freezing. The factory gauge moves up at the same rate and stays at the same place it did with the factory thermostat. If it's not paranoia, then you could have a bad thermostat.

Have you squeezed the top hose to see if it's building pressure? Is the overflow cap on? Just somethings to look at before deciding it's a bad thermostat assuming everything is good.
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Old 03-22-2008, 07:49 AM
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yea mine stays at the same spot too, just takes ALOT longer to get there. Yup all the caps are on. I will have to check it out and do what ya said. Lets say worse case scenerio it is bad, how much coolant am I gonna have to take out to put another one in?
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Old 03-22-2008, 07:57 AM
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The thermostat is few inches below the top of the radiator, so you'll loose a little.
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Old 03-22-2008, 07:57 AM
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gotcha. thanks. Ill look at it today
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Old 03-22-2008, 08:36 AM
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Is this a dieselsite thermostat?
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Old 03-22-2008, 08:43 AM
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it sure is
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Old 03-22-2008, 08:44 AM
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Quote:
Originally Posted by scheidt27 View Post
it sure is
How slow of a warmup are we talking?
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Old 03-22-2008, 08:49 AM
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lettting it warmup for 5 mins and driving on the freeway 60mph for 15-20 miles and still not up to temp when im pulling in my garage . In another instance I drove 40 miles, (it was cold and snowing) but anywyas was only driving 20mph tops the whole distance and it never got up to temp the whole time. Im going by what my stock guage says, and am guaging it by what it used to read when it was warm if that helps.

Last edited by scheidt27; 03-22-2008 at 09:01 AM.
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Old 03-22-2008, 09:03 AM
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I agree with above post about checking it see if it is building pressure. I always replace my overflow pressure cap every 2 years just in case.

Also, call Bob and tell him what it's doing.
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