Question about 1994 Buick Roadmaster

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1994 Buick Roadmaster won't divert heat to defroster or floor

No matter what position the electronic switch is in, the heat only comes from the vents on the dashboard. Could feel no air coming to the windshield whether the swith was on defrost or defog.

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There is a vacuum line that's plastic on the passenger side back near the firewall. Sometime they have a little black ball looking thing (vacuum canister) that the vacuum line hooks to. Look for vacuum leaks in that area. That will cause the problem you described.

Posted on Jan 14, 2009

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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 i turn the heat on cold air blows out of the heater vents


MODE DOOR NOT SWITCHING FROM AIR TO HEAT IT'S UNDER THE DASH THERE ARE TWO 1 THAT WORKS THE VENTS ONE THAT WORKS THE DOOR FOR THE HEAT AN AIR IF VENTS CHANGE FROM DEFROST TO DASH AN TO FLOOR IT IS THE MODE DOOR actuator

Nov 19, 2013 | 1994 Buick LeSabre

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2000 Buick Lesabre Limited with electronic climate control.


Could be a vacuum actuator problem. or just a vacuum leak, period. I have a Jeep that when it has a vac leak, the climate system defaults to the defrost, no matter what you set it at.

Feb 05, 2012 | 2000 Buick LeSabre

1 Answer

No heat or defrost in my 2000 mercury sable


If you are referring to the air won't blow through the defrost vents or on the floor, you may have a stuck or broken blend door actuator. This part diverts air through the different settings: defrost, vent, floor etc. If you aren't getting warm or hot air regardless of the settings, you may either be low on coolant or have a bad thermostat.

Oct 15, 2011 | 2000 Mercury Sable

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A/C from defroster vents only. Won't come out the dash vents or floor vents,


Most common cause is a bad blend door actuator. This controls how the air is diverted, Sometimes the actuator will become stuck in one position. There are 2 types, a cable driven or electronic driven. Search for blockages underneath the dash that could prevent the actuator from moving. Also, it's possible (if it's cable driven) that the cable is either broken or loose to the point where it won't move the door any longer.

Aug 23, 2011 | 1993 Chrysler Lebaron

1 Answer

Cold air comes out the defrost vent all the time. 1994 buick le sabre. no air comes out the front registers.


The most common cause is the blend door actuator. It's the door that diverts air between the floor, vents, and defroster. Sometimes the part will get stuck in 1 position. Some cars have cable driven blend doors, others are electronic.

Jun 02, 2011 | 1994 Buick LeSabre

1 Answer

2004 trailblazer dash vents fail to blow heat. All other vents work normally. I could not locate a vacuum hose that I thought might operate the upper dash vents. what do you suggest? Thank you.


this vehicle has electronic acuators that move the doors and do not use vacuum. the mode door actuator is bad causing this problem. there is a defrost acuator that works the defrost position and a mode door that works floor/vent operation. the defrost moves and diverts airflow up defrost vwents this is why you can still have defrost and floor.

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1 Answer

Defrost blows constantly? How do i fix it?


does it blow through the defrost vent only when you switch to vent/floor or does it blow through defrost and vent/floor? is it a switch that is just electric or a manual lever that you slide? the manual type will have that problem if the diverter or the linkage behind the lever(in the dash behind the panel......may be able to access underneath) becomes broken or disconnected so that the air is diverted to defrost regardless where you move it.if you can get to it, you will see what is broken or maybe a fastenerr fell off.

Feb 13, 2010 | 1994 Chevrolet C1500

1 Answer

Climate control will not divert air to defrost. 92 roadmaster


It could be either..but most likely electrical.....the door motor may be bad or the head unti( a/c heat panel) could be bad or have a bad switch in it.

Sep 14, 2009 | 1992 Buick Roadmaster

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