Question about 1999 GMC Yukon

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No heat on floor

I cannot get the heat to come out on the floor no matter what position the switch is in. comes out on defrost only is this the blend door not moving. and will new actuator fix it.

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Correct!

Posted on Dec 31, 2008

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Need pitcure of vaccum lines on 1999 Ford Ranger v6 3.o air and heat blows only threw the defroster.


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Item Part Number Description 1 18A318 Vacuum Control Motor-, Panel/Defrost Door 2 18A478 Panel/Defrost Door (Full Vacuum Position) 3 - Defrost Air Flow 4 - Side Window Demister Air Flow 5 18B545 Temperature Blend Door (Full Heat Position) 6 19860 A/C Evaporator Core 7 19A813 Air Inlet Duct Door (Full Vacuum Position) 8 - Outside Air Inlet 9 18A318 Vacuum Control Motor-, Air Inlet Duct Door 10 - Recirculated Air Inlet 11 18527 Blower Motor 12 19A566 A/C Vacuum Reservoir Tank and Bracket 13 - Vacuum from the Engine Intake Manifold 14 19B888 A/C-Heater Function Selector Switch 15 - Vacuum to the 4x4 Hub Solenoids 16 18495 Water Diverter Valve (Full Vacuum Position) 17 18476 Heater Core 18 18A559 Floor/Panel Door (Full Vacuum Position) 19 - Floor Air Flow 20 18A318 Vacuum Control Motor-, Floor/Panel Door 21 - Panel Vent Air Flow

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When you turn on heater it dont blow hot & it dont change to vent, defrost,floor


The control head that select heat/cold and where the air goes is vacuum controlled. There two vacuum "motors" under the dash that are used to move the blend doors to the heat or A/C position and for routing the air to the proper vent ducts. If neither is operating, chances are that the vacuum line that comes to the control head is broken. You need to locate it and repair it. If it is good, then you have issues in the blend box with the blend doors or the vacuum motors.

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How can i locate the blend door switch and replace it so i get heat on floor and not just defrost


You don't say the make and model and year of manufacture of your car. Come cars have vacuum controls for the blend door. Others have electric motors.

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Possible bad blend door actuator .some gm cars can be relearned to the new climate control head

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Air blows out all vents no matter where it is switched to heat or ac defrost, floor


its called the blend door actuator
its either stuck or or broken or shorted out it is deep in behind the dash located inside the air box where the heater core is and the ac condenser is its a fun job as for you have to rip your dash apart

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The most common problem is a stuck or faulty blend door under the dash.

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Heater blows out of defroster and floor vents no where else no matter where switch is set


Three things come to mind.
Defective door actuator.
Broken door.
Faulty switch.

Have someone operate the controls while you look up at the motors(at least three) blend, recirculation, and vent control.
observe the motors inaction you might be able to see the axles on them move. if all of them move, the door is at fault. Requiring dash and vent assy removal for repairs.

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Usually a sign of a faulty blend door under the dash. You should have someone check the blend doors to see if they are working correctly.

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My 1997 ford f150 heater will not blow hot air. i have replace the switch that controls the hot and cold air. i do not know what else to do. i do not heat any vacuum noise when i switch it to the heater or...


first, check under te hood to see if the heater core water hoses are hot going in and coming out. If hot going in but cold coming out, water valve (if you have one) may not be working.
------------------------------------------------------------------------------------------------
Control System Outputs
The air management doors are controlled by vacuum control motors (18A318) and an A/C electronic door actuator motor (19E616). The air inlet and distribution doors are controlled by vacuum control motors. The temperature blend door is controlled by the A/C electronic door actuator motor.
The A/C electronic door actuator motor provides a variable number of temperature blend door positions. Temperature control position energizes the A/C electronic door actuator motor moving the temperature blend door.
Vacuum control motors are used on both air distribution and air inlet doors. The air inlet and panel/defrost doors use a two position vacuum control motor. The floor duct/panel door uses a three position vacuum control motor. Vacuum control motors are controlled by engine vacuum through the climate control head.
For more information on the control components Section 412-04 .
-------------------------------------------------------------------------------------------------------------------------------------
Air Management Doors
The air management doors are controlled by vacuum control motors (18A318) and an A/C electronic door actuator motor (19E616). The air inlet and distribution doors are controlled by a vacuum control motor. The temperature blend door is controlled by the A/C electronic door actuator motor.
The A/C electronic door actuator motor provides a variable number of temperature blend door positions. Temperature control position energizes the A/C electronic door actuator motor moving the temperature blend door.
Vacuum control motors are used on both air distribution and air inlet doors. The air inlet and panel/defrost doors use a two position vacuum control motor. The floor duct/panel door uses a three position vacuum control motor. Vacuum control motors are controlled by engine vacuum through the climate control head.
-------------------------------------------------------------------------------------------------------------------
Section 412-04: Control Components - Climate Control 1997 F-150, F-250 Workshop Manual
REMOVAL AND INSTALLATION A/C Electronic Actuator
Removal
  1. Remove the floor duct panel.
    • Remove the two plastic push pins (one each side) and release the expander clip.
  1. Remove the RH instrument panel brace.
    1. Remove the lower nut.
    1. Remove the upper bolt.
    1. Remove the brace.
  1. Remove the LH instrument panel lower nut and position brace out of the way.
  1. Disconnect the vacuum harness from the vacuum actuator.
  1. Remove the floor duct.
    1. Remove the two screws (one each side).
    1. Remove the floor duct.
  1. Remove the panel/floor door vacuum control motor.
    1. Disconnect the vacuum line connector.
    1. Remove the two panel/floor door vacuum control motor screws.
    1. Slide the rod out of the door and remove the panel/floor door vacuum control motor.
  1. Remove the electronic actuator.
    1. Disconnect the electrical connector.
    1. Remove the three screws.
    1. Pull down to release the actuator shaft and remove the electronic actuator.

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bad switch the cheapest solution or the blend door is not responding to the switch you can locate the blend door under the dash

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