We had someone here just a few months back with a similar issue. Turned out the engine simply wasn't being given enough of a chance to fully warm up. Can take a good 15 minutes or more to reach maximum operating temperature, longer in really cold weather. Is the upper rad hose hot to confirm the thermostat is hot enough to open?
If both the dash gauge and the air coming out of the vents remain colder than normal after a good long run then that says the engine is overcooling. About the only way for that to happen is for the thermostat to stay open (stuck debris or a broken spring), opening too soon (incorrect thermostat, needs to be 85-91 deg C, check the stamp on it then test in boiling water bringing it up to a boil slowly) or not being properly installed (lip inside the rubber gasket, weep hole up high, spring down toward the block).
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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