Join Date: Nov 2014
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Coolant temp fluctuation?
I'm trying to figure out if I have an issue or not...
So my coolant temp (dash and cts II) will rise with boost if I have over 10psi for anything greater than 5 seconds or so... Not much though.. I have a 190f stat and usually it'll run 188-189 at idle... 191-192 at 70mph at 2-3psi and then rise to as much as 196-197 if I get on it and run >10psi of boost, ie moderately accelerating from a stop. It quickly drops back down. I've bled the system via cap and bleed scew in the stand pipe and I am fairly confident of that. There is no puking into the overflow and upper hose is firm but not rock hard. EGTs are not excessive and I haven't had a long enough pull to see over 950f.
Before I surmise it's the head gasket, I would like a high degree if confidence in that. Anything else to check or signs/symptoms? Or is minor temp flux normal?
Mods include EFILive although never used above 60hp tune, ARP 425s, full deletes, and other minor bolt ons.
2012 3500 CTD Megacab Laramie