Question about 2003 Pontiac Bonneville

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I have 03 bonneville se and the vent direction (floor, dash, defrost) is not changing. Just blows in floor and very little from defrost no matter the setting I put it on. Sure this is vacuum. Any help

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  • Pontiac Master
  • 1,167 Answers

Blend door actuator is usual culprit here

Posted on Apr 02, 2015

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 20 Answers

SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Posted on Feb 23, 2009

  • 37 Answers

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Posted on Mar 13, 2009

cadman000
  • 607 Answers

SOURCE: Air is blowing out of defroster and floor but not main dash vents

Check for vacuum hose leak.

Posted on Jun 17, 2009

  • 432 Answers

SOURCE: All Air Conditioning blows our the defrost vents

Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.

Posted on Oct 06, 2009

airjer995
  • 5332 Answers

SOURCE: 2004 Silverado 2500HD a/c is

Sounds like it is going through the recalibration process. We run into this issue when replacing the batteries on these. In the underhood fuse block there is a HVAC fuse. Pull it, wait 30 seconds, put it back in, and turn the key to the run position. You should hear the vents moving around. wait for about a minute or so, do not touch anything. If the self test/calibration passes everything will return to normal. If after several attempts you can not get it to return to normal than there is a problem with the HVAC system that will need to be resolved.

Posted on Sep 26, 2010

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I have a 98 bonneville se. the blower fan only comes on when the knob is all the way up and it ONLY blows heat and absolutely no cold also the air only blows out the defroster and the floor


How did you test the A/C system ? Hook up gauge manifold , test A/C pressures ? Manual or automatic climate control ? The blower motor only working on high means the blower motor resistor is bad ! Did you hook up a scan tool an check high an low pressure switchs inputs to the PCM - engine computer . Does the A/C compressor clutch engage ? turning on the compressor ? Moving the mode switch does nothing . Doesn't move from floor to vent to defrost ? Probably the mode door actuator ! Don't think the HVAC control panel is bad . Just a few little things . Pushing the A/C button on the control panel just send a electrical signal to the PCM , the PCM will energize the A/C clutch relay , turning on the compressor .

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May 19, 2017 | 1998 Pontiac Bonneville

1 Answer

How to repair


i'd think that the vent adjuster knob/slider is not working correctly strip out the heater panel around the control knobs and check the vent direction is working properly either stiff operation so a little wd40 on the cable would probably do the trick or some thing causing the vent itself to not move

May 01, 2014 | 2004 Ford Crown Victoria

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I need to know the location of the hvac heater blend door actuator on a 1998 pontiac bonneville se


Inside the dash ductiong about center of dash. You must remove the dash to get at it.

Apr 17, 2014 | Cars & Trucks

1 Answer

Ac vents not working


There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

Jun 13, 2012 | 2007 Ford Sport Trac Limited

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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

1998 Bonneville SLE A/C does not blow through dash vents, only defrost and floor vents. Air gets warm as car warms up. Compressor works. My research points to bad vacuum lines on programmer connector. ...


Look on the passengers side of engine there is a vacuum going to the intake manifold on the back side if this is cut or torn the vacuum won't work properly.You have to follow the line to where it has a fuse panel along the firewall there it goes into the vehicle...

Mar 09, 2009 | 1996 Pontiac Bonneville SE CA Value

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