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Joined: Mon Oct 23rd, 2017
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I'm completely drawing a blank. Checked the degauss bottle and coolant is at the upper mid/lower max line. So coolant is good. I even had the truck parked up hill the one day in the drive way with the heater on trying to see if it needed burped. Very hot heat, no issues or air that I could see that was trapped in system.
I don't know what else to check. All plugs and wires look fine. Get zero CEL lights/pending codes. I will get a CEL if I unplug the thermostat sensor plug which is good. Shows that it's functional but not sure why the temp keeps dropping like that.
No blockage in the radiator as that was replaced less than a year ago and when I drained out the coolant it was fine. No rust/nothing clogging anything.
Temp doesn't raise either or get too hot... so many threads on what is happening if the temp spikes or goes hot but not that much information on why it would drop, then eventually come back up to normal temp.
-Nigel
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2001 XLT 2.3L
~NSG~