Question about 2003 Mercury Grand Marquis

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Air condition will not cut off

My 87 year old father's vehicle, the Grand Marquis; the AC/blower will not cut off, unless the car is cut off completely. The second he turns the key, everything comes on. I just came back from the vehicle myself, and even though I attempted to cut off the system, the blower continued at full speed. I checked fuse 15 and 23, which according to the owners manual, were the fuses associated with the AC, and they were fine.
Do you have any suggestions before I call the dealer? My father and I thank you in advance.
Jeff

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Hi try removing the battery terminals for 15 mins and see what happens it may reset it to its original state just a suggestion let me know if you need more help

Posted on Jun 17, 2008

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Air condition blower doesnt work in 2003 mercury grand marquis


Removal & Installation To Remove:
  1. Disengage the wire harness connectors from the retainer.
  2. Disconnect the blower motor electrical connector.
  3. Remove the hose.
  4. Remove the screws and remove the blower motor. CAUTION
    Clean any corrosion from the blower motor shaft before removing the fan.
  5. Remove the wheel from the blower motor.
To Install:
  1. Install the wheel on the blower motor shaft.
  2. Place the blower motor in the housing and install the screws.
  3. Connect the hose to the blower motor.
  4. Connect the electrical connector.
  5. Install the electrical connectors in the retainer.
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1 Answer

2004 Mercury Grand Marquis with auto air condition. Blower does not come on AC / Heat still works but no air. I have replaced the blower motor, relay and fan control module but with no luck. Am I missing...


check for fuses. If some other defective stuff that you replaced broke the fuse then you may need to repower the system by replacing the fuse or a relay.

As for the air, do you mean no blower for both heat function and A/C function? An Owners Manual would show location for fuse and relay for blower. A web-search with term like "2004 Mercury Grand Marquis fuse panel or
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Last, do not know if blower resistor relay was known good quality. This part is tempermental. Sometimes takes tap from broom or snowbrush handle to wake it up. Sad part is that after warranty there is little benefit from a used to new part. Should have been a National recall on this part.

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Depending on the year of the car, you may have to get the system recharged. It is actually common to do this in cars that are more than a few years old.

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