Running cooler than normal

i have a 95 caprice with a 4.3L V8 and recently it has been running cooler than normal and the heat never gets very hot but it gets warm. by cooler i mean the meter on the dash used to go about half way and now it only goes a little more than 25% of the way. could this be the thermostat? any help would be appreciated

Sounds like the thermostat might be stuck open.

In my 88 caprice the meter never moves now in winter because i dont have thermostat , is it bad for my car?

thanks silicon

maybe the sending sensor too?