Question about 1998 Oldsmobile Bravada

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HVAC only blows hot air and moves between defrost, panel and floor

HVAC only blows hot air and automatically changes between defrost, panel and floor. The condenser is cold and AC motor kicks off and on but just hot.

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  • Oldsmobile Master
  • 3,103 Answers

Vacuum controls stuck work the knob a bit and try to free it..

Posted on Dec 29, 2013

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Posted on Jan 02, 2017

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SOURCE: Dashboard AC Vents don't work

check the vent housing under dash it is vacuum controled most likley you got a line off or broken not allowing door inside to open worse case scenerio the acuator on it has gone out and needs replaced hope this helps

Posted on Aug 31, 2008

  • 1915 Answers

SOURCE: Blend door stuck on heater position and driver

I had this exact problem in a 2000 and it ended up being the air filter (engine compartment, pasenger side cowl)-all I did was replace it and both sides worked properly-you could try removing it and see if that solves it, if not I would think either the climate controller has a problem (vacuum line?) or maybe the blend door itself needs to be adjusted-hope this helps

Posted on Jun 26, 2011

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Heat does not blow onto windscreen but blows through other vents - whats wrong


What make an model an year vehicle do you have ? The air blows out of the floor vents an center vents but not defrost ? Possible mode actuator , stuck mode door ! There is a door inside the heater / A/C assembly that directs the air to the desired position . These doors can be moved by a vacuum operated actuator or an electric motor . Sometimes thing's put on the dash end up inside the heater box , fall through defroster vent ! Pens , pencils etc.. Depends on the make vehicle an system , manual , or automatic climate control . Some of the newer vehicles the HVAC system as it is called , the control panel is a electronic control module an can store DTC'S - diagnostic trouble codes !

May 07, 2015 | Cars & Trucks

2 Answers

What part controls switching air/heat from defrost to bi-level to floor & where is it located?


In the attached drawing, Part 32 moves Part 26 to direct the air flow to the desired locations. It uses vacuum to operate. The actuator may be bad or the vacuum hose my have come loose when the heater core was changed. With the car running but the blower off stick your head up under the dash on the passenger side and see if you hear a hissing sound. If so it's probably just a vacuum hose come off.
AIR CONDITIONING AND HEATER UNIT BODY Fits DYNASTY LASER LEBARON NEW...

Dec 24, 2014 | Cars & Trucks

1 Answer

Only blows hot air and it move automatically from defrost, to panel to floor. When I turn AC on, it is still hot but AC motor kicks on and off and AC condenser is COLD.


Most likely low on refrigerant. Have system filled with refrigerant and a/c dye. Any leaks would be visible with black light and uv glasses.

Dec 29, 2013 | 1998 Oldsmobile Bravada

1 Answer

Ford Escape Heater Vent Control


suspect a control panel issue as this HVAC (heater, ventilation, Air conditioning ) system should be all electric... If you can pull the control panel out looking at the back of it will answer your question... are the cables or just wires..

Dec 28, 2013 | 2008 Ford Escape

1 Answer

Temp light flashes when car start up. turn on heater and blows cold air on passenger side, and barely warm on driver side. No blowing air from defroster. Will work occasionally but usually it is this...


Air Door Actuators/Motors Removal & Installation Recirculation Actuator 1996 - 1999 1996 - 1999 HVAC Actuators gm-10-00-1840.gif

To Remove:
  1. Remove the left sound insulator panel.
  2. Disconnect the vacuum hose from the recirculation actuator.
  3. Remove the recirculation actuator from the valve.
To Install:
  1. Connect the recirculation actuator to the valve.
  2. Clip the recirculation actuator to the air inlet.
  3. Connect the vacuum hose to the recirculation actuator.
  4. Install the left sound insulator panel.
2000 - 2005 2000 - 2005 Recirculation Actuator gm-10-00-1559.gif

To Remove:
  1. Remove the instrument panel compartment.
  2. Remove the right sound insulator.
  3. Remove the dash integration module from the bracket.
  4. Remove the 2 dash integration module bracket fasteners and position the bracket to gain access to the recirculation actuator.
  5. Disconnect the electrical connector from the recirculation actuator.
  6. Remove the recirculation actuator.
To Install:
  1. Install the recirculation actuator and torque the fasteners to 12 in-lbs (1.4 Nm).
  2. Connect the electrical connector to the recirculation actuator.
  3. Install the dash integration module bracket and torque the fasteners to 12 in-lbs (1.4 Nm).
  4. Install the dash integration module into the bracket.
  5. Install the right sound insulator.
  6. Install the instrument panel compartment.
  7. Recalibrate the actuator.
Defroster Valve Actuator 1996 - 1999 1996 - 1999 HVAC Actuators gm-10-00-1840.gif

To Remove:
  1. Remove the air distributor assembly.
  2. Unclip the defroster valve actuator from the air inlet.
  3. Disconnect the defroster valve actuator from the valve.
To Install:
  1. Disconnect the defroster valve actuator from the valve.
  2. Clip the defroster valve actuator from the air inlet.
  3. Install the air distributor assembly.
Heater/Bi-Level Actuator 1996 - 1999 1996 - 1999 HVAC Actuators gm-10-00-1840.gif

To Remove:
  1. Remove the air distributor assembly.
  2. Remove the clip and the screws that fasten the 2 halves of the air distributor assembly and separate the air distributor assembly.
  3. Unclip and disconnect the heater/bi-level actuator from the valve.
To Install:
  1. Connect and clip the heater/bi-level actuator to the valve.
  2. Fasten the 2 halves of the air distributor assembly together and torque the fasteners to 13 in-lbs (1.5 Nm).
  3. Install the air distributor assembly.
Temperature Actuator 1996 - 1999 1996 - 1999 HVAC Actuators gm-10-00-1840.gif

To Remove:
  1. Remove the instrument panel assembly.
  2. By snapping the rod out of the valve, remove the temperature valve link rod from the temperature valve.
  3. Disconnect the electrical connector from the temperature actuator.
  4. Remove the temperature actuator.
To Install:
  1. Install the temperature actuator and torque the fasteners to 12 in-lbs (1.4 Nm).
  2. Connect the electrical connector to the temperature actuator.
  3. Start the vehicle.
  4. Set the fan to position to high.
  5. Set the temperature to full hot.
  6. Allow a minimum of 45 seconds for the temperature valve actuator to move to the full hot position.
  7. Move the temperature valve to the full hot position.
  8. Snap the temperature valve link rod into the temperature valve.
  9. Install the instrument panel assembly.
Mode Actuator 2000 - 2005 Mode and Left Air Temperature Actuator gm-10-00-1560.gif

To Remove:
  1. Remove the left side sound insulator panel.
  2. Remove the knee bolster.
  3. Remove the instrument panel cluster. (Automatic HVAC)
  4. Disconnect the electrical connector from the left air temperature actuator. (Automatic HVAC)
  5. Remove the left air temperature actuator. (Automatic HVAC)
  6. Disconnect the electrical connector from the mode actuator.
  7. Remove the mode actuator.
To Install:
  1. Align the mode door levers with the cam slots.
  2. Install the mode actuator and torque the fasteners to 12 in-lbs (1.4 Nm).
  3. Connect the electrical connector to the mode actuator.
  4. Install the left air temperature actuator and torque the fasteners to 12 in-lbs (1.4 Nm). (Automatic HVAC)
  5. Connect the electrical connector to the left air temperature actuator. (Automatic HVAC)
  6. Install the instrument panel cluster. (Automatic HVAC)
  7. Install the knee bolster.
  8. Install the left side sound insulator panel.
  9. Recalibrate the actuators.
Left Air Temperature Actuator 2000 - 2005 Mode and Left Air Temperature Actuator gm-10-00-1560.gif

To Remove:
  1. Remove the left side sound insulator panel.
  2. Remove the knee bolster.
  3. Remove the instrument panel cluster.
  4. Disconnect the electrical connector from the left air temperature actuator.
  5. Remove the left air temperature actuator retaining screws.
  6. Remove the left air temperature actuator.
To Install:
  1. Install the left air temperature actuator and torque the fasteners to 12 in-lbs (1.4 Nm).
  2. Connect the electrical connector to the left air temperature actuator.
  3. Install the instrument panel cluster.
  4. Install the knee bolster.
  5. Install the left side sound insulator panel.
  6. Recalibrate the actuators.
Air temperature Actuator (Manual), Right Air temperature Actuator (Automatic) 2000 - 2005 Right Air Temperature Actuator gm-10-00-1561.gif

To Remove:
  1. Remove the instrument panel compartment.
  2. Disconnect the electrical connector from the air temperature actuator.
  3. Remove the right air temperature actuator.
To Install:
  1. Install the air temperature actuator and torque the fasteners to 12 in-lbs (1.4 Nm).
  2. Connect the electrical connector to the air temperature actuator.
  3. Install the instrument panel compartment.
  4. Recalibrate the actuators.
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Nov 03, 2010 | 1998 Buick LeSabre

1 Answer

Ac blowing heat on side and air on the other side.


Air Door Actuators Removal & Installation Console Mode To Remove:
  1. Remove the center console from the vehicle.
  2. Detach the air outlet duct from the center console.
  3. Disconnect the console mode actuator connector.
  4. Detach the console mode actuator from the center console.
To Install:
  1. Attach the console mode actuator to the center console. Torque the screws to 17 in-lb (1.9 Nm).
  2. Connect the console mode actuator connector.
  3. Attach the air outlet duct to the center console. Torque the screw to 17 in-lb (1.9 Nm).
  4. Install the center console into the vehicle.
Left Side Air Temperature To Remove:
  1. Remove the instrument panel carrier from the instrument panel.
  2. Disconnect the left side air temperature actuator connector. HVAC control module - left side gm-10-00-1844.gif

  3. Detach the left side air temperature actuator from the HVAC module.
To Install:
  1. Attach the left side air temperature actuator to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  2. Connect the left side air temperature actuator connector.
  3. Install the instrument panel carrier onto the instrument panel.
  4. Recalibrate the left side air temperature actuator.
Right Side Air Temperature To Remove:
  1. Remove the instrument panel carrier from the instrument panel.
  2. Disconnect the right side air temperature actuator connector.
  3. Detach the right side air temperature actuator from the HVAC module.
To Install:
  1. Attach the right side air temperature actuator to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  2. Connect the left side air temperature actuator connector.
  3. Install the instrument panel carrier onto the instrument panel.
  4. Recalibrate the right side air temperature actuator.
Mode To Remove:
  1. Remove the left floor duct from under the instrument panel (I/P).
  2. Disconnect the mode actuator connector. HVAC control module - left side gm-10-00-1844.gif

  3. Detach the mode actuator from the HVAC module.
To Install:
  1. If installing a new mode actuator, move the mode door to the middle position.
  2. Attach the mode actuator to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  3. Connect the mode actuator connector.
  4. Install the left floor duct under the instrument panel (I/P).
  5. Recalibrate the mode actuator.
Defrost Valve To Remove:
  1. Remove the instrument panel carrier from the instrument panel.
  2. Disconnect the defrost valve actuator connector. HVAC control module - left side gm-10-00-1844.gif

  3. Detach the defrost valve actuator from the HVAC module.
To Install:
  1. Attach the defrost valve actuator to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  2. Connect the defrost valve actuator connector.
  3. Install the instrument panel carrier onto the instrument panel.
Recirculation To Remove:
  1. Remove the HVAC module from the instrument panel.
  2. Detach the air inlet assembly from the HVAC module. Recirculation actuator removal and installation gm-10-00-1845.gif

  3. Disconnect the recirculation actuator connector.
  4. Detach the recirculation actuator from the HVAC module.
To Install:
  1. Attach the recirculation actuator to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  2. Attach the air inlet assembly to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  3. Connect the recirculation actuator connector.
  4. Install the HVAC module into the instrument panel.
  5. Recalibrate the recirculation actuator.
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Aug 17, 2010 | 2004 GMC Envoy

2 Answers

I changed the battery on 2006 Trailblazer SS. Now I can only get AC from my windshield and floor vents. Nothing from the dash vents. Also the temp control only gives coldest temp. I have checked fuses...


once you disconnect the battery your body control module loses power and memory you have to get some one with a scanner with reprogramming capabilities and have the computers reset ,dealer?

Aug 05, 2010 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

Location and removal of the air vent actuator. step by step on how to get to it and replace it. Air blows and I can control hot and cold but I cant change from floor to vent to dash. It just keeps blowing...


Removal & Installation
  1. Remove the floor air outlet duct extension from the floor duct.
  2. Remove the center console, if equipped.
  3. Remove the screws from the center console duct, if equipped.
  4. Remove the center console duct, if equipped.
  5. Disconnect the electrical connection at the mode actuator.
  6. Remove the mode actuator mounting screws from the HVAC module.
  7. Remove the mode actuator as an assembly with the actuator cam.

98d9332.gif
Mode actuator location

To install:
  1. Install the mode actuator as an assembly with the actuator cam.
  2. Line up the heater/defroster valve lever with the mode actuator cam slot.
  3. Line up the A/C valve lever with the mode actuator cam.
  4. Install the mode actuator mounting screw to the HVAC module and tighten to 14 inch lbs. (1.6 Nm).
  5. Connect the electrical connection at the mode actuator.
  6. Install the center console duct, if equipped.
  7. Install the screws to the center console duct, if equipped, and tighten to 14 inch lbs. (1.6 Nm).
  8. Install the center console, if equipped.
  9. Install the floor air outlet duct extension to the floor air duct.
  10. Calibrate the HVAC module actuators.

Apr 18, 2010 | 2004 Chevrolet Tahoe

2 Answers

Air vents are stuck in the floor and defroster mode in my 96 Blazer. Air will blow cold and hot, just can't change where it blows. Please advise


The HVAC door actuators are powered by vacuum, and the default position is the defrost/floor. Check for a disconnected or broken vacuum line somewhere near the passenger rear of the intake manifold. You should be able to find a line coming out of the firewall in the same area and follow it to the intake. Good luck

Nov 05, 2009 | 1996 Chevrolet Blazer

1 Answer

A/c problem


You either have a bad control, or motor running the air direction door in the front HVAC unit, or a door that is stuck.

The front and rear units are totally separate.

The door directs where the air, cold or hot, should come out, whether it is panel vents, floor, defrost, or any combination of those.

This door and motor are located inside the heater box which usually requires a lot of the vehicle dash assembly to be taken apart to get to these parts.

Aug 28, 2008 | 2000 Ford Expedition

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