Ok, this may not be your answer but I ran across this and it may help someone.
Cold start, both t-stats closed, coolant pumps to oil filter-flywheel houseing cross over-block-heads-EGR and heater core @ 26GPM. Engines warms to 180* first stage of the primary t-stat allowing some flow to the radiator. At 185* secondary t-stat starts to open flowing more to the radiator. In here @ arond 132* the turbo starts recieveing coolant through a thermo controlled circuit by-pass. At 203* the primary stat is full open. At 212* the seconday stat is full open, all coolant is through radiator and flow is near 80 GPM. Now this is for the LLY engine. bob.............
Bob O.
2004 K2500 DA LLY CC LT LB Wow! Edge w/A + BS + CAT pre fuel filter, 06 air box,
2002 C6500 EC. 7.2 Cat NoMar rollback/ 92 C7500, 7.2 Cat, 25ton No-Mar / 2005 C5500 D/A rollback / 1969 Corvette 350-350 4spd AC T-top stock orginal
XP850LE WOW nice ATV, 09-550XP hers, 03-Predator, 04 Honda400EX, 05-Banshee, 08-KTM525, 08 KFX700, 38' enclosed GN hitch