This should be an easy one.
My 1993 Sentra XE has fewer than 50,000 original miles. Lately the temp indicator in the dash either registers very low or doesn't budge at all.
With the engine warm and the heater full on, the vent air is only slightly warm. Does that mean the engine thermostat isn't opening? Or stuck open?
Central Gulf coast area. (i.e. mild temps)