97 tahoe LT super low air flow from vents

[Marbor]

good afternoon to all

I just replaced the blower motor, control switch and module thing next to the blower that controls the low-high functions. My issue is the air blows out very low. I checked the little motors that switch from defrost to feet and face and all seem ok working as should. low air just blows from what its set on. I also youtubed and performed the cleaning of the core inside the box feom were the bloer mounts and removed little debris, sprayed with decreaser and scrubbed with a tooth brush then sprayed inside with a hose. Peaked in with my phone on record and it looks pretty clean inside. Is there something I'm missing? I'm dying from heat the ac works,but blows out very little air. Please help me solve this issue.

Thanks

 

[Big Mama]

Does it do the same on heat? What did it do prior to this? If the air ways are clear it comes back to the parts you replaced or a relay ready to fail. How’s the ground and battery cables and wires/connections to the new parts?

 

[OR VietVet]

Did you replace parts with quality parts or aftermarket cheap parts? I was waiting for you to say you can hear the blower blowing hard and that you still can't feel it. If the blower is blowing hard, you have a restriction somewhere. If the blower is blowing slow no matter what setting you choose, then I suspect a part problem or an installer problem, you.

 

[Marbor]

Did you replace parts with quality parts or aftermarket cheap parts? I was waiting for you to say you can hear the blower blowing hard and that you still can't feel it. If the blower is blowing hard, you have a restriction somewhere. If the blower is blowing slow no matter what setting you choose, then I suspect a part problem or an installer problem, you.

Yes the blower is blowing hard i can hear it from low to high and it is going good. As far as parts the control module and relay/ spring thing next to the blower are from a junk yard but the blower I got from 1A auto new. No change whether its heat or AV. I know there's a restriction somewhere but just can't find it

 

[Marbor]

Does it do the same on heat? What did it do prior to this? If the air ways are clear it comes back to the parts you replaced or a relay ready to fail. How’s the ground and battery cables and wires/connections to the new parts?

Blower is strong and brand new. Tested terminal with multimeter and comes in at 12.6 on battery jumps to low 13.1-6 when running

 

[Marbor]

Yes the blower is blowing hard i can hear it from low to high and it is going good. As far as parts the control module and relay/ spring thing next to the blower are from a junk yard but the blower I got from 1A auto new. No change whether its heat or AV. I know there's a restriction somewhere but just can't find it

Also install was flawless even got that hard as s crew against the metal rail in and tights no room for leaks.

 

[OR VietVet]

Ok, all the basics are checked now and it has to be a flow restriction somewhere.

 

[Marbor]

Ok, all the basics are checked now and it has to be a flow restriction somewhere.

What else can I do to find the restriction? Any ideas

 

[Big Mama]

Does the rear blow any faster? Not sure where your ducts are but prob under the seat and/or the headliner? This might help narrow it a little.

 

[Marbor]

Does the rear blow any faster? Not sure where your ducts are but prob under the seat and/or the headliner? This might help narrow it a little.

Good question, this truck is unique. There is no standard rear vents. It has the geneva package which has a separate blower and evaporater connected in the rear passenger corner with 3 vent hole and a blower. I belive its a camping edition, weird set up but cool as hell.
In a nut shell the front controls the front and rear controls rear from under the hood there are 4 hoses 2 tap into the AC and 2 tap into the coolant lines running under the truck to the ac/heat blower/ HVAC.

 

[TheAutumnWind]

Duct seals bad? They are foam and become dust over time iirc. Could be leaking air and losing pressure.

 

[Bobio2003]

Make sure there is no restriction to the incoming air, leaves, pine needles or other debris. If it can't draw air in, it can't blow it out. If yours has a cabin air filter, change it.

 

[liquify33]

Make sure there is no restriction to the incoming air, leaves, pine needles or other debris. If it can't draw air in, it can't blow it out. If yours has a cabin air filter, change it.

I *believe* the air is pulled from the cowl area. It might be good to pull up the passenger and possibly center sections and check for debris/clogs.
I used a small shop vac to get into the evaporator area and get leaves and pine needles out of mine.