Question about 2000 Mercury Grand Marquis
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Posted on Jan 02, 2017
SOURCE: climate control codes
I have checked every site that I can think of and run the question many times, unable to get the procedure, maybe a nice tech at the local dealer will help u out, if not I guess buying a service manual might be your only option. I am a retired Ford mechanic, I did almost all the AC work, I never found this problem was a control head issue, it was always the blend door electric motor, I think you can see it from the glove box if you remove the liner.
Posted on Sep 09, 2008
probably has a bad belend air door motor, to run the systen completely through its self diagnosis process" if has electronic auto temp control"
press."off "and "floor" at the same time release... then hit the "auto" button
wait til gives you code...... it will then "SOMETIMES start WORK normal til moved again by you.....
if manual, change hot to cold, listen carefully for clicking ...if clicking rplave blend door motor and inspect the plenums door while motor out
Posted on Jan 20, 2010
I'm not sure if yours is identical to mine since yours is second gen and mine is third gen, but with mine (1998 MGM), the heat was stuck on all the time. Full heat would practically cook your feet and you couldn't shut it off.
It was a servo/servo arm that controls the hot/cold mix door. The part was $15. The labor was $700. They had to take the entire dash out of the car to get at the part. Required two more visits due to a missed electrical connection to a daylight sensor and a vacuum issue that made the car stall when put into reverse.
My car had 150K on it at the time. Has 165K on it now. Still runs great and looks great. It's now my wife's auto and I drive a 2006 MGM.
Posted on May 13, 2009
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Dec 26, 2015 | Chevrolet Monte Carlo Cars & Trucks
Sep 15, 2014 | 2003 Mercury Grand Marquis
Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
all modern cars there is a tiny DC electric motor driven gear drive
that moves a plastic door that blends heated and cooled air from the
AC and the heater core, this is called (interestedly enough) the air
temperature control blend door actuator. The motor that moves this
door fails because the door starts sticking from warping, most common
complaint is no heat but it can be no AC as well. To replace these
parts (blend door and blend door actuator) you must remove the entire
dash from the car. Always have this problem confirmed by a dealer or
qualified repair shop as it is a very expensive repair.
Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.
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