car heater

180,000 MILES • 6 CYL • 2WD • AUTOMATIC
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CHEROKEECHUCK82011
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  • 3 POSTS
my heater only blows cold air, and i hear clunk sound underneath, and when i hear it, i get hot air for 3 seconds
Feb 11, 2011 at 5:53 AM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
Sounds like a blend door that is stuck. These direct heat to vents and lower vents. If they are stuck (closed), you would not get heat.
Feb 11, 2011 at 5:57 AM
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CHEROKEECHUCK82011
  • MEMBER
  • 3 POSTS
but i cant seem to find a blend door for a 99 monte..does it have a blend door on it?
Feb 11, 2011 at 7:15 AM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
They are inside air ducts. They are mechanical "doors" that divert air as mentioned.
Feb 11, 2011 at 10:43 AM
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