99 Mercury Grand Marquis  Heat / AC problem Forums at Automotive.com
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99 Mercury Grand Marquis Heat / AC problem

 
rwb4646 rwb4646
New User | Posts: 2 | Joined: 03/08
Posted: 03/10/08
03:12 PM

No matter what setting I select all I get is uncontrolable heat . My mechanic is stumped . He replaced the blender door motor and a sensor and it worked 3 or 4 times and then went back to heat only even on the vent or AC setting. Any help would be appreciated .  

 
jgate jgate
Enthusiast | Posts: 666 | Joined: 06/07
Posted: 03/11/08
07:48 AM

It could be a broken blend door. They are plastic and were the actuator connects to the door , they will break off of door.  

 
jdgomez jdgomez
New User | Posts: 1 | Joined: 04/08
Posted: 04/09/08
07:51 PM

Must be a broken blend door. Check this first, then update us on what happened.   You don't know if you have to replace the whole A/C itself like what I did with my BMW 525i a/c condenser when it got the similar symptoms.