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...
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