2004 Mercury Mountaineer Thumping

2004 MERCURY MOUNTAINEER
92,000 MILES • 6 CYL • AWD • AUTOMATIC
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HAPPY64
  • MEMBER
  • 1 POST
When I change the temperature dail to hot it starting making a thumping sounds. I haven't even turn the fan on yet.
Apr 6, 2009 at 9:47 AM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Have the blender door checked.
May 11, 2009 at 9:53 AM
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