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Old 03-15-2019, 05:04 PM
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"Normal" Temperature Operating Range

I have a 3.0 and I'm trying to find info on the "normal" coolant temperature range. I put my scanner on and drove around for awhile. Around town the temp varies up and down between about 192 and 204 with spikes to 206. When I jump on the freeway and get up to about 80 mph the temp drops to about 180. The first time I checked this it dropped to 176. The temp then fluctuates between 180 and 190/192 while on the freeway. Is this normal? Seems like the t-stat is allowing about 20 to 30 degree variation. That seems pretty big to me, but I'm no expert.
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Old 03-15-2019, 10:37 PM
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That’s pretty normal. You can unlock your obc. Link in my sig. you can monitor coolant temp right on your dash.
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Old 03-15-2019, 10:39 PM
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Yes, the point of the heated thermostat is to allow the DME to vary the temp.
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Old 03-15-2019, 10:46 PM
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Quote:
Originally Posted by 80stech View Post
Yes, the point of the heated thermostat is to allow the DME to vary the temp.
Interesting. I didn't realize it was heated. I thought the stat would try to keep the temperature in a narrow range for fuel mileage and emissions.
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Old 03-15-2019, 10:59 PM
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The goal is to keep combustions temperatures down to reduce Nox emissions with out using a troublesome EGR valve and also try to keep some fuel efficiency. It actually works well doing that. If you recode your temp gauge to what Overboost suggests you can actually see that working as well as monitor when you aux fan cuts in if you take off your mechanical fan for the winter like I do.
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Old 03-15-2019, 11:41 PM
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Quote:
Originally Posted by 80stech View Post
The goal is to keep combustions temperatures down to reduce Nox emissions with out using a troublesome EGR valve and also try to keep some fuel efficiency. It actually works well doing that. If you recode your temp gauge to what Overboost suggests you can actually see that working as well as monitor when you aux fan cuts in if you take off your mechanical fan for the winter like I do.
Thanks. I live in "sunny California" so I don't have to pull my fan. Rare is the time it gets to 32f around here.
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Old 03-16-2019, 12:04 AM
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That's a Great idea to remove the mechanical fan! I'm going to start doing that! I've blocked my fan from moving and I've put cardboard in front of the radiator to help warm the engine (or get csbin heat when the t-stat failed open)


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