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Thanks for all the input, I think such issues are new to me and yet universal for the diesel world.
I have been chasing two problems now. One is determining if the current thermostat is faulty and secondly how to cope with it since the engine is not retaining heat.
It was purchased with a 140F thermostat for running in the blazing heat of Phoenix, AZ and so once replacing it it only went up to 160F. I figured it was faulty since the temp was low and then again replaced it about a month ago in preparation for winter. The current tstat hits 190F (where it should be) then drops dramatically back to 150 and then climbs back up to 190F.
Since it's been cold (for me) the engine barely hits 150F without any fluctuation so I am thinking of trying to first block the grille or alternately pull the fan since apparently the cooling system is doing too good of a job!
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