Good news: No - so much easier than that!
See "Related Questions" below for lots of help in making the replacement...
This sounds like a temperature blend door problem - with the door stuck in the heat position. See "Related Questions" below for information on Taurus/Sable blend door actuator motors and blend doors
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Please review the "Related Questions" below for more specific details regarding the temperature blend door and its actuator motor.
There are 2 common questions relating to the temperature blend door on a Taurus / Sable:What moves themHow to replace themThe "Related Questions" below address both
Sounds like the heater's temperature blend door is stuck in the hot positions. See "Related Questions" below for lots more about dealing with it - hopefully yours is just the actuator and a simple repair.
Replace auto lamp module.
The Grand Marquis uses the same HVAC system as the Ford Taurus and Mercury Sable and all three automobiles suffer from the same blend door failures. The actuator is located on the front side of the plenum box and you can see it if you fully open the glove box and look to the left over the transmission tunnel. The recommended dealer fix is to remove the dash and plenum box and replace the plastic door. There is a kit on Ebay from HeaterTreater that offers a cheap easier fix for this problem.
The Sable uses the same HVAC system as the Ford Taurus. Replacement of the door by the dealer involves removing the dash, evacuating the AC and coolant systems and replacing the plastic door with another plastic door that will also break over time. HeaterTreater is the world's leader in aftermarket blend door fixes and has a kit for an easy inexpensive repair for the Mercury Sable. Diagnostic information and pictures are available on the Mercury Sable HeaterTreater Ebay listing or on the web site at www.heatertreater.net.cgallen ----Be sure to review the Related Questions below for much more information & options when dealing with Sable/Taurus heater problems.
No, you do not.
Mercury Sable was created in 1986.
You must remove the fuel tank in order to replace the fuel pump.