92 Explorer Running Cold. All the time!

[nickrahn]

Hey Guys,
I seen a couple threads on here about the explorers running cold but not really anything helpful to me.
My explorer is running cold, barely off the cold mark. am I wrong that it should be sitting in the middle?
I replaced the thermostat and next is the heater core. I even put cardboard behind the grill with no difference. any help would be awesome. Thanks

 

[BlakeOfDoom]

a cooler engine is a good thing, but not heating up can be bad. Soooooo.......check on the gauge, I have a 91 that has a little dot on the temperature gauge showing above normal operation.

 

[Blacksheep Josh]

Thermostat could still be bad.... just because it's new doesn't mean it's working correctly... you could remove it, and put it in a pot of water and slowly heat the water and see if it opens/closes as it should.

Temperature sending unit could also be bad as well... Does the gauge change at all?