Thermostat come in different temperature ratings - meaning the valve opens at a specific temperature.
Likely your new one is a higher temp (192?), thereby keeping the coolant from getting to the heater core until that higher temperature is achieved.
Not sure what the specific numbers are, but you might want to swap it again for something lower (180 degrees?).
probably the heater core is clogged
That or the thermostat.
Low coolant? Thermostat not opening?
Check into the temperature control valve--this is different than the thermostat.
Check the coolant in the 96 Taurus. Check to insure that the thermostat is working properly, and that the water pump is working.
I have a 1997 Ford Taurus that would only blow cold air, I replaced the thermostat and no heat. We flushed the system from a ford dealer no heat. Had to replace the heater core plenty of heat now. Other possibilities are: * a malfunctioning temperature blend door * Plugged heater core See "Related Questions" below for more
if you have already replaced the thermostat ,try replacing the heating core . it's located under the passanger side dash . There are a number of other things to investigate before going to the major under-taking of the heater core. See "Related Questions" below for a comprehensive trouble-shooting guide to Taurus/Sable heating problems.
The heater cor was replaced but it is still not getting warm
If a thermostat is not working properly, you cannot calibrate it. It must be replaced.
the heater core could be pluged or the heater control valve is stuck closed
Thermostat probably needs to be replaced.
Was the gasket replaced? Have you checked the hose and the heater core. Is everything tightened down?