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2001 Silverado dash vents won't blow any air

Cannot get any air from dash vents while defrost and floor vents work fine.

2001 Silverado dash vents won't blow any air

Postby Konan8828 [OP] » Apr 01 2013, 5:28pm

OK, trying to help my 82 y/o Dad figure out a problem he is having on his 2001 Chevy Silverado. The dashboard vents will not blow any air but the defrost and floor vents work fine. Not a blower motor issue, can be heard running. Thought it could be a blin door issue but that seems to be more related to temperature control than what vent the air is discharged from. Could the cabin air filter be clogged up to a point that it has restricted airflow to nothing? My 2004 Sierra is just different enough that I'm not sure at this point. Has anyone ever expericed this problem? Any help would be greatly appreciated. :?:
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Related Topics  Air only blows out of the dash vents sometimes....   2003 Silverado Little To No Air from Vents   2001 Silverado 1500 5.3 4wd won't start   AC won't blow out defrost   on=blowing out od dash vents only no ac no lights help!   Air wont blow when on fan speed 1   no air coming out of vents   no air coming out from vents   Vents always blows hot air   Interior LED Lighting - Air Vents   When set on floor, air also comes from side window vents   passenger side blows ice cold, by the floor. lil air vents   cranks, won't start & no dash lights   2014 Silverado. no rear vents? 
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Re: 2001 Silverado dash vents won't blow any air

Postby Daly » Apr 01 2013, 10:34pm

It's the doors inside the vent system, they can break and stop working. They can be fixed, but I've heard it can be a bit of a bitch.
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Re: 2001 Silverado dash vents won't blow any air

Postby Konan8828 [OP] » Apr 01 2013, 11:03pm

Thank you Daly for the reply, any idea how to check and see if these doors you speak off have broke? Checks that can be done, short cuts to verify or dismiss them as the problem? Thanks in advance for your input.
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Re: 2001 Silverado dash vents won't blow any air

Postby Stelcom66 » Apr 05 2013, 2:55am

I'd be interested to see what you find. I just bought a '99 doing the same thing. Also the blower only works on high - I'm hoping that's just the blower resistors. The situation I have that makes it not so clear where the resistor is located is that although the Silverado I just bought was listed as a '99 by the dealership - everything else points to it being a '98. For example, the engine is the 5.0 V8. Photos online and Edmunds.com show my style as a '98. The local Chevy dealership (not where I bought it) said there was a changeover mid year to the newer '99 style, I assume engines also such as the 4.8 and 5.3 V8s. I gave the dealership my VIN - they have the resistor. From what I saw based on the '98 design I'll need to remove the glovebox to get to it. Looks like the newer '99's have it inside a black housing under the glove compartment area. The mechanic at the dealership where I bought it told me the blower speed isn't controlled by the resistor - but in the main control panel in the dash. All electronic via a voltage regulator?

Also the driver's side door won't turn on the dome light. It got too dark this evening to look around. I don't know if its just a normally open switch that closes when the door opens. It's been years since I've had that trouble.

It's nice owning a truck again now that I have room in the driveway for one. Even though it has a few minor things wrong with it I really like this '99(8?) Silverado.
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Re: 2001 Silverado dash vents won't blow any air

Postby Stelcom66 » Apr 07 2013, 6:38pm

I replaced the resistor circuit behind the glovebox, have different speeds now but not sure it will last. One the resistors got very hot after a few seconds, maybe an indication of the blower motor drawing excessive current.

The mode actuator moves with every mode setting as well as the lever attached to it.
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Re: 2001 Silverado dash vents won't blow any air

Postby Konan8828 [OP] » Apr 08 2013, 6:50pm

OK, found the problem.
Mode Actuator.jpg

It was a bad Mode actuator, just above the gas pedal. Old one would move but only about 30% of the normal range of movement. $80 for the replacement part and all is working as advertised.
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Re: 2001 Silverado dash vents won't blow any air

Postby Stelcom66 » Apr 08 2013, 11:23pm

That's great you got it working. Mine is a different situation since the actuator moves to a different position with every mode setting. The sound of the air changes - seems like Daly said there's other doors not opening.
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Re: 2001 Silverado dash vents won't blow any air

Postby Konan8828 [OP] » Apr 09 2013, 12:15am

Good luck Stelcom66 but I might suggest you check to see if there have been any recalls to your truck, my 2004 Sierra was recalled due to the blower not working on the highest setting.......
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Re: 2001 Silverado dash vents won't blow any air

Postby Stelcom66 » Apr 09 2013, 12:32am

Thanks Konan8828 - I'll check about recalls. Probably it's just due to age. It's not a huge deal since the truck will be used occasionally, but It would be good to get those vents working. It was hard to tell during the test drive last week due to the weather but the A/C may work. That wouldn't be very effective without those working. I wonder if the dealership gave you that diagram - my local GM dealership gave me a couple when I bought the blower resistor. The one with the blower resistor was somewhat deceiving as to the location. I actually found the exact location by watching a post on Youtube.
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Re: 2001 Silverado dash vents won't blow any air

Postby Richmc » Apr 12 2013, 6:08pm

I guess I got lucky. I was having very low air on my 2001. I just replaced the cabin filters. I believe it was the original one that were in there. Completely clog and had leaves and other debris in there. Put new filters in, fired her up and not good strong blast of air comes out.
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