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The Pontiac Grand Am is a mid-size size (and later compact) car produced by Pontiac. The 1999-2005 generation is the final generation of the Pontiac Grand Am.

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Why does my heater only blow through cabin and floor vents?

2004 pontiac grand am heater only blows through cabin and floor vents, no defrost

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malcolmphillips86, malcolm, Could be disconnected/broken vacuum line at the air mode door actuator or under the hood in engine compartment( you may hear a hissing sound) if vacuum line disconnected or it could be faulty/stuck actuator, or stuck/broken air mode door. Check the attached links,instruction and guides, Good luck.

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https://www.youtube.com/watch?v=lPzbkBAL...

http://www.grandprixforums.net/threads/2...

http://www.justanswer.com/pontiac/73jxs-...

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