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Do thermostats simply begin to open at their rated temp or is the rated temp the temp when it first is fully open? I understand they can take up to 20 degrees F from starting to open to fully open?
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Yes, the rated temp is the point at which the thermostat is activated. It takes time for the internal heat motor to fully open and by then the coolant would have come up some more.
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Hmmm... so if I'm due for a thermostat and live in a cold winter area that plans to track next summer. Would I go with this thermostat or stick with oem?
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If you'll be driving it through the winter as well then I'd go with the 190. Next year I'd monitor your temps during the summer. Personally I don't think I'd want to use a 190 on a bunch of track sessions...