Where is the heater core? Unfortunately, the heater core is way up under the dash.
From the engine compartment side, look for the 2 heater hoses coming "through" the firewall, right about dead-center.
What about pictures? Since WikiAnswers doesn't 'do' photos/images, you could refer to:
I really don't know what you mean by a diagram. D you mean an exploded view of the dash? I have worked for Ford for years, and I have never seen such an animal. Are you trying to replace your heater core? All instructions to do that in all Ford service manuals are in text, with very few pictures.
See "Related Questions" below for much more about Taurus/Sable heater cores and heating problems.
There is a mechanic who found a way to do it without dash removal, in 1996-1999 Taurus / Sables.
* Library - you can review a number of manuals they'll have for the procedure - use the copy machine to get the relevant pages to take home and get all greasy.
* Haynes or Chiltons manuals are around $15 (US) and a great investment if you do much of your own repair and maintenance work. Check any auto parts or book stores for these.
Start with the "Related Question" below - this is an excellent starting point to extensive coverage and information on Taurus/Sable heating & cooling problems and fixes -including the heater core procedures & options.
I have found the the easiest and least expensive way to find any diagram for replacing parts is in the local library, go to the reference section, get the haynes or Chiltons book that corresponds to your car. look in the index under heating and cooling. and find the step by step instructions with pictures, diagrams, etc. copy them on the library copy machine, and take them home. Saves money.
Getting the dash out is the worst of it all: do yourself a favor and either purchase the Haynes or Chilton's manual for about $18, or visit your local library and copy the dash removal instruction pages from the manuals they'll you look at for free! :)
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