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Lack of air flow through vents.

Tiny
ONLYDAVIS
  • MEMBER
  • 1995 BUICK PARK AVENUE
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 221,000 MILES
I have a new blower motor. Recently repaired vacuum leak that was causing vent doors to not work. A/C is cold but the vents do not move the air hardly at all. Heat is the same way. Blower motor adjusts speed as it should and vents switch as they should.. Please help. 95 buick park avenue ultra 3.8l supercharged.
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Tuesday, July 29th, 2014 AT 5:07 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
If all vent doors are not working properly, I would think you still have a leak or the vacuum supply is weak. Have you checked vacuum at the supply hose inside the vehicle?
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Tuesday, July 29th, 2014 AT 6:38 PM
Tiny
ONLYDAVIS
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  • 5 POSTS
I have not checked the vacuum with a gauge. All vents are equally low in air flow. I manually actuated the doors and saw no improvement.
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Tuesday, July 29th, 2014 AT 6:47 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
I have a stupid question. I believe your vehicle has a cabin air filter. Have you checked it to make sure it isn't plugged?
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Tuesday, July 29th, 2014 AT 8:08 PM
Tiny
ONLYDAVIS
  • MEMBER
  • 5 POSTS
I have not. What is the best way at accessing it? I thought those were for when you had recirculation only?
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Tuesday, July 29th, 2014 AT 8:10 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
I'm not at work right now, so I don't have the procedure book with me. I checked on line and there is one available for your vehicle.

I can tell you this, most GM vehicles have them located near the cowl. Open the hood. On the passenger side, between the windshield and firewall, there is a black plastic cover. Check for plastic push pins that hold it in place. Remove the pins and lift the plastic cover. Look down inside. This is where the air enters the HVAC system. There should be a filter there which is to clean the air entering the cabin much like a furnace filter in your home does.

If the filter is extremely dirty, it WILL cut down on the air supply to the fan causing low air flow in the vehicle. I don't know what made this pop into my head, but I feel it is something that should be checked.

Let me know what you find. I will be online for about another 15 minutes. If you can, let me know what you find. If I am incorrect, I can check location tomorrow for you.

Let me know.
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Tuesday, July 29th, 2014 AT 8:30 PM
Tiny
ONLYDAVIS
  • MEMBER
  • 5 POSTS
I did not get a chance to look last night, I will look under the cowel tonight. Can you look up the exact location and how it should be removed? As stated before, the fan changes speeds as it should and the vents appear to be switching as they should. Just not getting enough air movement into the car.
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Wednesday, July 30th, 2014 AT 9:36 AM
Tiny
ONLYDAVIS
  • MEMBER
  • 5 POSTS
I broke the harness plug for the blower motor apart and reversed the polarity on the motor. I have more airflow now than I would ever need. I had replaced this in January and install the same way as the old one they must've sold me the wrong motor? Thank you for the help though!
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Wednesday, July 30th, 2014 AT 3:04 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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So the plug was different and the polarity got switched? That will definately cause a problem. I have to be honest, although I know the fan would be blowing the wrong direction, I never considered that as a possible problem.

Regardless, I'm glad you got it fixed. Take care.
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Wednesday, July 30th, 2014 AT 8:37 PM

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