2004 GRAND MARQUIS blower motor

Asked by May 25, 2019 at 06:37 PM about the 2004 Mercury Grand Marquis

Question type: Maintenance & Repair

I have a 2004 grand marquis with
automatic temperature control  that
erractically blows air, I have already
changed the blower resistor and
blower motor and problem still exists.
I've read able changing the speed
selector switch but after researching I
dont believe the automatic
temperature control has a switch that
can be changed.

2 Answers

Check and see if there is a control valve in one of the heater hoses, if it does this might be bad. Also check the switch for the blower motor it might have a short.


Sounds like the control module under the hood is bad. It's located on the firewall about center. Usually when it fails the system defaults to high blower speed though. Hope that helps! Jim

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