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Assuming you're referring to the heater core, see "Related Questions" below for tons of detailed information about Taurus/Sable heating systems...
LOTS - it is virtually inaccessible .
I am very sorry. I was under the impression that if I go to the address bar and ask a question. The answer would be right forecoming. I only asked how to replace the heater core on a 2000 ford taurus. And received only run-arounds.
The dash has to be removed to gain access to the heater box. The heater box then comes out and is split open to replace the core.
your heater core is leaking i would replace it.
Behind the dashboard on the passenger side. The whole dash has to come out to replace it.
Sounds just like a leaking heater core. See "Related Questions" below for more
How do you replace a heater core in a 1998 ford expedition?"
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.
How yo take a heater core out of 2002 lincoln navigator with 5.8 engine and can you do it without removing inside dashboard?
Heater core, water pump, leaking lines, vacuum leak, thermostat are the most common fixes. If you look up Ford Taurus and any of those words between the commas it will tell you where it is and how to check or replace it.
it should, unless there was a major body style change between the 2 years.