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

Dec 09, 2016 | Ford Ranger Cars & Trucks

1 Answer

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.

Jan 26, 2015 | Cars & Trucks

1 Answer

My air condition and heat works on defrost only sometime comes out vents last seconds didn't matter were controller set


Not sure what year, make or model vehicle is in question, but the issue is due to an actuator that has gone bad. Sometimes referred to as a mode actuator or blend door actuator. This actuator controls where air/heat will blow from (defroster vent, forward vents, floor vents or combo, etc.). Good luck. Ron @ Speed-O-Repair.

Aug 24, 2014 | Cars & Trucks

1 Answer

Air blend door actuator


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

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1 Answer

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

May 18, 2013 | 2006 Kia Sorento

1 Answer

2002 buick heater control


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.

Aug 29, 2012 | 2002 Buick Century

1 Answer

The heat in my 2004 jeep grand cherokee only blows threw the defroster. when switched to vents or floor it still only comes out the defrost. any suggestions


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

Dec 07, 2009 | 2004 Jeep Grand Cherokee

2 Answers

No dashboard heat output


The climate control was poorly designed on these cars.

There is only heat on the floor and defrost settings, due to the layout of the ductwork.

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