You have to start with diagnosis - there's more than one thing possible which could be wrong with it, and you left us with no idea what the condition is... we have no way of telling if the air going through the ducts just isn't getting hot or if the fan's not blowing at all. So, there is no way for us to answer this question with any brevity, because we have no means of diagnosing the issue.
No one knows if:The heater is NOT blowing - or blowing on high speed only, or... The heater IS blowing, but the air is NOT hotEither way, the "Related Questions" below will get you started
The Ford Taurus is famous for having leaking heater core. It is located on the passenger side inside the passenger compartment and inside the dashboard. It costs about $1000 to get a mechanic to fix it.
You cannot "fix" it. But you can replace it in about an hour.
replace coil
no no
1999 Ford Taurus. System Adaptive fuel too lean banks 1 and 2. How can I fix these.
replace the brake line and then bleed the brakes
how to fix a 2006 ford rsc sensor
Trouble code P0500 means: Vehicle Speed Sensor A
You cannot "fix" it. But you can replace it in about an hour.
Check vacuum lines and canister first
buy a manual at auto zone its only about 10 dollars