Heater/ac diagram what hoses connect to what under the hood for heater/ac. no air isn’t blowing through the air vents, only blows air below towards the floor 86 cutlass supreme briugham 307 v8 5.0 rwd (y)

There should be one small vacuum hose under the hood that goes thru the firewall and to the HVAC control head. I would bet that this hose is no longer connected or has become brittle and broken under the hood.

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.

possible heater hot water control valve. if equipped would be found on one of the heater hoses under the hood. also try cafeully pinching the heater hoses to stop water flow.

• If the AC/heater air control doesn't work, you most likely have a vacuum line broken. All the air flow doors in the heater system are vacuum operated and without it the air will blow out of the windshield defrost vents. The common place for a vacuum line to break is under the hood where the lines pass near a hot area. The vacuum lines are normally a rigid black plastic tubing about 3/16 inch in diameter. They run across the engine compartment fastened to the section just below the wipers and air vent. The tube goes through the dash, usually near the steering column. When the tubing has been hot for long time it becomes brittle and cracks or breaks. Trace this tubing looking for a crack or break. The easiest repair is to cut out the broken section and replace it with rubber hose of the correct diameter. The hose needs to have an inside diameter that will fit snugly on to the vacuum tubing.
  

  
  

  Thanks for using FixYa.
  

  Gaker
  

Check for a cracked or broken vacuum hose under the hood, close to the cow panel....

You need to check the heater core it has two hoses going to it feel of them if one is hot and the other cold heater core is stopped up replace it or flush it out if they are both hot it can be the switch or a vacuum line the vacuum line will be on the passenger side under the hood where the airconditioner hoses go in the body

Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.

on your vehilce it does not use vacuum to control the vent direction.
It uses a series of actuators (electrical).
My guess is that the air blows out the defrost (top vents) this is the default position for the mode door actuator.
More than likely it will have to be replaced.

Your heater valve is stuck open, also in a pinch you can crimp off your hose to the heater coil at fire wall. Try to find the heater valve vacumb hose under the hood see if it is bad and fixit. or some models have a cable to the valve could be broken. 

look for a broken plastic vacuum line under hood, vacuum is what controls the heater controls inside the car