Question about 2007 Mercury Grand Marquis GS Sedan

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1996 mercury grand marquis gs dash blower switch

The blower only works on high no mater what your trying to use ...ac/heater/vent/defrost. i have already replaced the HVAC blower control switch but it didnt change a thing.

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  • FinbarOS Mar 03, 2009

    2006 Mercury Grand marquis LS. Blower fan is constantly on high. Doesn't matter whether in automatic or manual mode.

  • Anonymous Mar 22, 2014

    How do you replace ac heater control for 94 grand marquis How do you get to it etc.

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Heres the electrical diag.....1996 mercury grand marquis gs dash blower switch - 58909880

Posted on Oct 09, 2008

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Replace the blower motor resistor...The resistor limits voltage to the blower motor in all fan speeds except high...Good Luck!!

Posted on Oct 09, 2008

  • LouAnn Halas Loveless
    LouAnn Halas Loveless Sep 16, 2013

    My 2008 Mercury Grand Marquis does not blow air. You can adjust the temperature, and you will feel cold air (or warm air) but the fan doesn't work. My mechanic is saying we need a whole new in-dash unit, ($600 dealer part) but I'm wondering and hoping if it's only the blower control module ($30) Any opinions?

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As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

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Heater and AC and blower all work fine but it all blows out of defroster vents thats about it , when AC is on it comes out defroster vents,no matter your selection. Heater is the same way.


The HVAC mode selections on these are controlled by an electric stepper motor that receives commands from the BCM (body control module). The BCM decides where the air door should be by looking at where the dash control input is.
Each mode selected has a different resistance level. From low resistance to high resistance: Panel, Bi-Level, Floor, Mix and Defrost, with Defrost as the highest resistance (~100K ohms). A high resistance or open circuit would probably default the system to defrost no matter what position the mode control was set to.
If the control is dirty or there is a connection issue, this could cause this problem. Does playing with the control make any difference?
The BCM can store fault codes with HVAC releated information. The system can be reset and recalibrated with a battery disconnect, this will also erase any fault codes.
I would start by looking at the dash mode control.

Good luck, i hope this helps.

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