2007 Mercury Marquis

2007 MERCURY MARQUIS
60,000 MILES • V8 • 2WD • AUTOMATIC
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RETIRED508
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  • 1 POST
My heater/air conditioner blows hot/cold air through the defroster and the floor vents, but not through the vents in the dashboard.Is this an expensive problem to fix?
Jul 29, 2010 at 4:37 PM
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MERLIN2021
  • CAR REPAIR CONTRIBUTOR
  • 17,250 POSTS
No, hopefully! It sounds like the vacuum supply line has a leak. Find the thin black(usually) or white hose the comes in through the firewall and test it for leaks. If it has auto temp control let me know.
Jul 29, 2010 at 4:41 PM
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MERLIN2021
  • CAR REPAIR CONTRIBUTOR
  • 17,250 POSTS


https://images.2carpros.com/forum/automotive_pictures/62217_AC_Vac_Res_1.jpg

Look for this vacuum reservoir, inspect it for leaks, a vacuum test pump is ideal for this. Check vacuum lines to and from it, if OK, look inside and under the dash, inspect the vacuum motors that operate the door for airflow. something has a vacuum leak.


https://images.2carpros.com/forum/automotive_pictures/62217_res_a_1.jpg


https://images.2carpros.com/forum/automotive_pictures/62217_resb_1.jpg

Jul 30, 2010 at 7:22 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.