grand marquis ac control issues

Asked by Apr 04, 2016 at 10:59 PM about the 2003 Mercury Grand Marquis

Question type: Maintenance & Repair

control unit has been replaced 5 times.  then resistor is replaced  ac will blow
cold for 4 or 5 days then stop and only blow hot,  any ideas?  thanks

1 Answer


Usually air flow issues on these cars is the blend door actuator. The blend door actuator moves the blend door to direct heat and a/c. The entire dash needs to be removed to replace the blend door correctly, but there are some short cuts posted on the web. Do a "google" search for mercury blend door actuator replacement and make sure your symptoms are caused by the blend door actuator. If you do replace the actuator make sure you only use a genuine Ford / Mercury part as some of the aftermarket actuators are inferior quality.

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