Question about 1998 Mercury Grand Marquis
A/c not working for cold air , lower temp to 60 degrees and no cold air only hot air! switched control panel and still does not work
Perform a self test on heater control head if it's electronic,... push floor and off button at the same time with key on, release, then press the auto button one time. This puts control head into self test. If you hear a clicking noise from your glove box area, probably a bad temperature blend door, also it will show a code on control head screen.post code here or Google it. Hope that helps. . Please rate if it helps you.
Posted on Jun 17, 2014
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Posted on Jan 02, 2017
It could be the door that should be shuting off the heater core area is not shuting.The door works with engine vaccuum.The vac. comes from the intake manifold. With your car being a few years old, the heat from the engine may have caused the vac. hose to dry out and crack or become disconnected. With the engine cold and off, look under the hood. A small size vaccuum hose should be connected to the intake manifold and run inside the cabin area. This is one thing you can check. I hope this helps you.
Posted on Sep 05, 2009
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