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There was a question in this forum as to the location of the heater core on a 2002 Ford Taurus. Since I can't find who asked, the location is behind the dash so if you want to replace it you would have to remove the dash completely. A mechanic shop will charge you for a 2 day job approximately $700 to $800.
This is a very big job, You must remove the complete dash assembly, then remove the heater box assembly , then replace the heater core and reassmble everything that was removed to gain access to the heater core.
Ck Eng light probably not related.
The heater core is clogged. A bottle of cooling system "quick flush" may be all you need ($6 AutoZone).
There is also a complete flush system, but requires that you splice into the heater hose (I installed it on my Taurus - works great!).
By the way, there is a heater core bypass hose. It is connected to the two heater core hoses near the firewall. You may want to remove the two "Tee" fittings and use a 5/8" hose splicer so that the flush passes through the heater core at full force. Put the Tee's back in place after the flush.
If you remove the tee fittings and don't flush, the heater will work, but the core may eventually start leaking.
These are on of the hardest heater cores in the industry to replace. A typical garage will get between $800.00 and $1200.00 to replace, the dealer will get $1600.00 because you have to completely remove the steering column the dash, discharge the A/C system reomve the heater box, split it and replace the core. The job is so labor intensive you would be crazy not to replace the A/C evaporator at the same time. This is not a job for an amature or ever a class "B" tech. leave this one to the Pro's.