Question about 2001 Buick Century

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Air blows out on bi-level no matter what the switch position on 01 Century

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  • Expert
  • 102 Answers

The Resistor on the control is bad. Get it checked

Posted on May 04, 2015

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6ya6ya

6ya staff

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Posted on Jan 02, 2017

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Dar

  • 2007 Answers

SOURCE: bi-level on heat/ac does not blow air out the front dash vents. It is at least partially vacuum controlled.

Check under your hood for broken or loose vacuum lines. Also, the pot on the hood? i believe, on that one. There should be avacuum line running to it. Looks like a little bowling ball. With your engine running , listen for a hissing.

Posted on Jun 07, 2009

jimmybrown67

JIMMY BROWN

  • 835 Answers

SOURCE: 97 olds lss, air blows out of all vents, cannot

VACUUM LINE BAD OR ACCUMALATOR BAD

Posted on Dec 12, 2010

David Ward

  • 227 Answers

SOURCE: were is the heater and defrost contorl valve at?

are you talk about blenddoor it on right side under dash

Posted on Feb 01, 2011

oneStan

oneStan

  • 434 Answers

SOURCE: 03 buick century, ac control knob blows out on all vents regardless where I position it. David

This usually is related to the vacuum reservior tank/cannister or the hose leading to that chamber. Any other vacuum hose leak could cause a similar problem depending upon it's location.

The hose leading to the cannister is usually just a thin single hose/tube leading to the cannister. The system allows vacuum to build up in the vehicle and maintains vacuum on the A/C system under heavy acceleration where a loss of vacuum would cause the A/C to change operation (switching from defrost to other venting and vice-versa) due to the loss.

You could have a cracked vacuum hose, or a cracked cannister.

You can use regular carburetor cleaner in a spray can with a nozzle, and carefully spray the vacuum lines on your vehicle when idling, and should notice a change in RPMs if you spray near a leak. Only spray a small amount at a time and let the engine compartment air out between spraying/testing since this is a flammable product.

This should lead you to identify any leaks.

Good luck!

Posted on Mar 29, 2012

skychief2001

Stephen

  • 21873 Answers

SOURCE: heat and air are not blowing

Usually if the vent system is vac operated, the air will blow out the defrost if the system fails. I am showing a blend door actuator that could have stuck in one place. But it could have vac controls too.
If you can see the actuators that control the direction of air flow you can test them with a vac gauge and hand pump.
You may need to get a used shop manual to get the repair procedures.

Posted on Mar 04, 2013

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1 Answer

My ac on my 1998 oldsmobile 88 won't blow out the be-level what could it be


I believe you mean "BI-LEVEL" mode, which means it should blow air simultaneously out of the dashboard registers and the lower register. The Temperature of the air blowing out of both of them is regulated by the temperature preset.
Does the fan still blow when you move the switch to BI-LEVEL? If it does but the air comes out of the DEFROST registers, that means your diverter is not functioning correctly, most likely due to a vacuum leak under the dash. If the fan shuts off in BI-LEVEL mode but still operates in HEAT mode, your selector module is bad. If the fan shuts off in BI-LEVEL mode and in HEAT mode, either your engine coolant is not hot enough to provide heat (automatic function), or the temperature sensor for your climate control system has failed.

Jul 19, 2014 | Cars & Trucks

1 Answer

03 buick century, ac control knob blows out on all vents regardless where I position it. David


This usually is related to the vacuum reservior tank/cannister or the hose leading to that chamber. Any other vacuum hose leak could cause a similar problem depending upon it's location.

The hose leading to the cannister is usually just a thin single hose/tube leading to the cannister. The system allows vacuum to build up in the vehicle and maintains vacuum on the A/C system under heavy acceleration where a loss of vacuum would cause the A/C to change operation (switching from defrost to other venting and vice-versa) due to the loss.

You could have a cracked vacuum hose, or a cracked cannister.

You can use regular carburetor cleaner in a spray can with a nozzle, and carefully spray the vacuum lines on your vehicle when idling, and should notice a change in RPMs if you spray near a leak. Only spray a small amount at a time and let the engine compartment air out between spraying/testing since this is a flammable product.

This should lead you to identify any leaks.

Good luck!

Mar 28, 2012 | Buick Century Cars & Trucks

1 Answer

2002 trailblazer has four loud clicking noise when i start it sounds like it is be hind 4wd selector switch?


#04-01-38-002A: Clicking Noise From Instrument Panel After Vehicle is Started (Replace Mode Valve Actuator Assembly Using Special Tool GE-47676) - SUPERSEDED BY BULLETIN 05-01-38-001A - (Oct 21, 2005) Mode Valve Actuator Replacement Tools RequiredGE-47676 Mode Actuator Removal Tool
Removal Procedure
  1. Remove the left floor duct. Refer to Floor Air Outlet Duct Replacement - Left Side .
  2. Important: The service actuator is positioned in the bi-level mode. Place the mode door in the middle of the door's travel.
  3. Disconnect the mode actuator electrical connector.
  4. Remove the mode actuator mounting screws.
  5. Using GE-47676 remove the mode actuator.
Installation Procedure
  1. Install the mode actuator.
  2. Notice: Refer to Fastener Notice in the Preface section.
  3. Install the mode actuator mounting screws.
  4. Tighten
    Tighten the screws to 1.9 N·m (17 lb in).
  5. Connect the mode actuator electrical connector.
  6. Install the left floor duct. Refer to Floor Air Outlet Duct Replacement - Left Side .

Jul 29, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

Recirclation light blinks on and off and will not stay on anf fan does not blow at full force when it's switch to level 5.


{: ) Regardless of the blower motor switch position, recirculation is available only in the panel and bi-level mode switch positions. Including the OFF position. The mode switch must be placed in either the panel or bi-level position before the blower motor switch is placed in the OFF position. In order to reduce windshield fogging, outside air is circulated when the mode switch is in the defrost or defog positions. If the recirculation switch is pressed into the ON position when the mode switch is in an unavailable mode position, then the recirculation switch LED will flash 3 times. If the HVAC control module detects a fault with the recirc door the HVAC control module will try to drive the actuator for a predetermined amount of time, to outside air, which is the defaulted position for the recirculation actuator.
As for your blower not full force at level 5, check first the BLWR fuse 40A at the underhood fuse block. If its okay, most likely you have a malfunctioning blower motor resistor assembly.

Jul 06, 2010 | 2006 Chevrolet Trailblazer

4 Answers

When i press the ac button it blinks three times but does not turn on. 2007 Tahoe LT


If your vehicle is equipped with automatic climate control, this should help.

Recirculation Operation
The HVAC control module controls the air intake through the recirculation actuator. The recirculation switch closes the recirculation door in order to circulate the air within the vehicle. The outside air switch opens the recirculation door in order to route outside air into the vehicle. Regardless of the blower motor switch position, recirculation is available only in the panel and bi-level mode switch positions. Including the OFF position. The mode switch must be placed in either the panel or bi-level position before the blower motor switch is placed in the OFF position. In order to reduce windshield fogging, outside air is circulated when the mode switch is in the defrost or defog positions. If the recirculation switch is pressed into the ON position when the mode switch is in an unavailable mode position, then the recirculation switch LED will flash 3 times. If the HVAC control module detects a fault with the recirc door the HVAC control module will try to drive the actuator for a predetermined amount of time, to outside air, which is the defaulted position for the recirculation actuator

Oct 17, 2009 | 2007 Chevrolet Tahoe

1 Answer

1988 1500 series half ton. Air vents to mid dash and defroster won't open up. Heat and air blows on the floor only.


It sounds like the door on the defroster isn't opening. Check for a vacuum leak and also check the temp.control valve this should have several vacuum hoses coming from it. This valve controls all the doors, Bi-level, Defroster, and Floor positions.

Oct 05, 2009 | 1988 Chevrolet K1500

1 Answer

Bi-level on heat/ac does not blow air out the front dash vents. It is at least partially vacuum controlled.


Check under your hood for broken or loose vacuum lines. Also, the pot on the hood? i believe, on that one. There should be avacuum line running to it. Looks like a little bowling ball. With your engine running , listen for a hissing.

Jun 03, 2009 | 1992 Chevrolet S-10

1 Answer

2001 ford focus defroster blows out ac vents


may be just a cable adjustment.


SECTION 412-01: Air Distribution and Filtering 2001 Focus Workshop Manual DESCRIPTION AND OPERATION Air Distribution and Filtering The new heating and ventilation system ensures even air distribution.
The temperature control and air distribution flaps are controlled by two operating cables. All vehicles have a recirculated air function, with the flap controlled by a servo motor.
Air is supplied to the windscreen and side windows regardless of the air distribution setting.
The clean air filter is fitted as standard in most countries. This cleans the incoming fresh air of pollen and dirt particles. It must be renewed after every 40,000 km under normal operation conditions, or after 20,000 km under difficult conditions. If no clean air filter is installed, a plastic grille is fitted over the air intake. This can easily be replaced with a clean air filter.
Air distribution operating switch
Face level The main flow of air enters the passenger compartment at face level.
Face level/floor level The main flow of air enters the passenger compartment in equal parts at face level and floor level, and a small amount flows to the demister nozzles of the side windows.
Floor level The main flow of air enters the passenger compartment at floor level, and a smaller amount flows to the demister nozzles of the side windows.
Demist/floor level The main flow of air enters the passenger compartment in equal parts at the windscreen and at floor level, and a smaller amount flows to the demister nozzles of the side windows.
Demist The main flow of air enters the passenger compartment at the windscreen and a smaller amount flows to the demister nozzles of the side windows.
Air distribution operating switch Air distribution operating cables
NOTE: The Bowden cables for LHD and RHD vehicles are identical. However, they are fastened to the air flap operating mechanism with the respective reverse side of their connectors.
The air distribution switch operates with two Bowden cables. The cables operate the air distribution valves in the heater housing.
To remove and install the cables, the rotary switch must be turned as far as it will go to the left. The air flap mechanism engages easily in this position, making the installation of the cables easier.
--------------------------------
Air Distribution Cable Control Assembly Removal
s1y~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Disconnect the battery ground cable. For additional information, refer to Section 414-01 .
  1. Remove the radio/cassette unit and the CD player (if equipped). For additional information, refer to Section 415-01 .
  1. Remove the bezel with heater/air conditioning controls.
  1. Remove the bezel with heater/air conditioning controls (continued).
    • Pull off seven electrical connectors (six shown).
  1. NOTE: To remove the Bowden cables, turn the rotary switches as far as they will go to the left.
    Remove the bezel with heater/air conditioning controls (continued).
    • Unclip the Bowden cables.
  1. Remove the lower driver's side footwell trim.
  1. Unclip and remove the air distribution Bowden cables.
  1. Unclip and remove the temperature control Bowden cables.
    • Unclip and remove the temperature control Bowden cables.
Installation
  1. NOTE: Route the new Bowden cables without kinks and check for easy accessibility.
    NOTE: To install the Bowden cables, turn the rotary switches as far as they will go to the left. The mechanism engages easily in this position.
    NOTE: The Bowden cables are identical for RHD and LHD vehicles, although they are fastened to the air flap operating mechanism with the reverse side of their connectors.
    Install the components in reverse order.
  1. Check operation of the Bowden cables.

Mar 17, 2009 | 2003 Ford Focus

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