Mechanics

MY GRAND LS BLOWS HOT AIR. AFTER TURNING THE AC / HEAT ON AND OFF IT WILL EVENTUALLY SWITCH BACK OVER TO COLD A/C. A/C WILL RUN AS LONG AS YOU DON'T CHANGE THE TEMPATURE. I DID CHECK THE VACCUM LINES AND THEY ALL LOOK LIKE THEY ARE IN

1999 Mercury Marquis • 124,000 miles

I have removed the entire dash to check vaccum lines. I also removed the ac/heater temp control unit. You know where you turn on and off the ac defroster heat ECT ECT. Any help would be greatly helpful
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Stephen Tatro
December 17, 2011.




Check to see if you have a vacuum leak first, then check to see if your actuators are working. They are under dash on heat unit. Generic pic enclosed.


Hmac300
Dec 17, 2011.


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