2009 Nissan Sentra AC will only blow out of defrost/floor. The lights on the dials have changed, the light on the dial to switch to vents/floor has started glowing much brighter than usual, with the o

Possibly the plugs either aren't connected properly or incorrectly plugged. Recheck the plugs. Also check fuses, maybe one blew while it was being plugged. The work should have been done with the battery disconnected for that reason.

usually a faulty blend door under the dash

You may have a clip broken on the underside of the vent dial. Take the control unit out or at least get it in position to drill two very small holes and insert two very small screws into the metal clip where it fits over the cable in the back of the control unit. What has happened is the plastic broke at one end where the metal clip fits under the plastic.

check for a broken /loose vacuum line on the engine . Trace it back to the fire wall and it will most likely be the culprit/

The flow switch it change's howthe air flows get a motor manual at auto parts stir about 25 bucs it will tell u what up

the heater vacuum motor and lines needs to be checked.Also get the blend door checked.

NO HEAT ON FLOOR VENTS

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As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

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No heat on Oldsmobile Silhouette?

http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

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Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

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1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

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No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

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Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

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Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

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Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

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Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

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2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html

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2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

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AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

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Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

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These will help.

Thanks.

SEE WHAT COLOR THE AC MAG CLUTCH RELAY IS / UNDER THE HOOD RELAY BLOCK IF IT IS WHITE TRY REPLACING IT WITH ONE OF THE BLUE ONES IN THIS SAME BLOCK (HORN RELAY) IF COMPRESSOR ENGAGES REPLACE WITH TOYOTA UPDATED RELAY ( PLEASE RANK THIS)

vent door is stuck open

a/c is active when in defrost mode to remove moisture from air. what controls the movement from vent to heat/ or defrost. a lever or switch.

Yes, this appears to be a 'feature' and not a problem. They might have been drinking when programming the a/c and recirc features of the Rogue's ventilation system as everyone seems to be confused about how it defaults to certain settings at various times.