Re: EOT vs ECT-Large Delta, but low ECT...?
If you have faith that your measuring instrument (?) is accurate, your thermostat is not complete up to par. And yes, it's a good idea to replace it.
As far as your EOT
, yes, the delta is higher than it should be, but 200°F EOT
isn't really anything to be alarmed about, IMHO
Personally, I would remove the thermostat, do an extensive coolant flush (including backflushing the oil cooler – heater core too while you're at it), replace the thermostat, refill with a good ELC coolant, and then see where you're at.
2004 F-250 Lariat, 6.0, SCLB, 4wd, Magnaflow turbo-back, EGR delete, studded, 6.4 banjo, new oil cooler and HPOP as of 5-11-2014
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