||10-01-2013 10:40 PM
Had the same problem. Changed to a new ford thermostat, then an aftermarket, and then another Ford . The last one brought the temps up. Also when the temps are low my deltas were greater. I had even done the flush, and was running with cardboard in front of radiator. So good luck, and get a Ford thermostat from a different dealer. So your maybe not getting one from the same lot. About drove me nuts trying to figure that one out.
Guess I need to update my sig to reflect the cure on low temps.