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You could start using it now. The Ford PSD cooling system is really over kill. I've used grille blocks on my E350 PSD in summer time while pulling a trailer.
Let me ask a better question. Why would the use of a grill block benefit me? I assume it gets the truck to operating temperature more quickly?
It would reduce the amount of outside air going across the radiator, so, yes, it can get you up to temperature more quickly.
I use a 203 degree thermostat also. Did the same with my E350 pulling in warm months to keep the engine warmer too. I never could get the cooling fan to come on with that set up also.
It's an easy and reversible thing that one can do. You probably remember last year when it was -10 in January. Any little bit helps.
Stock is something like 192 or 195 degrees. The 203 Tstat is available from Diesel Site. It's not a Ford OEM item, and the International part won't fit as the T444E and the PSD have some different internals on the bypass part of the water pump.
Use Google, and that should bring up their web address. I'm not sure what this forum has for posting requirements on possibly non sponsor items.
Stock (FORD INSTALLED) T-Stat is 195* go check Dieselsite for the billet T-Stat housing, 203 T-Stat, and their great coolant filter setup if you haven't already got one-also get nes bolts for the housing while you are at it-from an International dealer if possible .27-.36 each v/s over 3.00 each from Ford.