Problems..

[SunlitComet]

the board is part of the front module hvac control itself. It is not fully enlosed so when you unclip it from the dash structure and pull it out you will see the solder side of the circuit board facing up and exposed. Makes it easy to short something out. If you did your testing properly and it is indeed your blower switch and nothing else then that switch by itself is replaceable so you don't have to replace the module. Would you like some wiring diagrams to help diagnose?

---------- Post added at 01:59 PM ---------- Previous post was at 01:46 PM ----------

BTW if you have a three dial rear control you have heating as well as air conditioning. If you have a single dial then air conditioning only.

---------- Post added at 02:03 PM ---------- Previous post was at 01:59 PM ----------

Just post some pics of your control panels to verify.

 

[96GMCYukonGT]

Off-topic: I just gotta say every time I see this thread when I pull up the 'new posts' Jay-Z's song "99 Problems" pops into my head....


on-topic: back to our regularly scheduled programming....

lmao

 

[MTman777]

ok... so i just verified that my blower motor works... what now?... you guys metioned something about a board... what the diagram and wheres it located? I really need to get this problem fixed.. have a baby due in 6 weeks so rollin with the windows down isnt gonna work anymore.. HELP!!

 

[MTman777]

Bump

 

[Monstar_est87]

My tahoe got 99 problems but a ***** aint 1...
Sunlitcomet ment a wiring diagram 2 help u find the problem... The air that is seeping through as u mentioned is just ur trucks air vents... It just introduces outside air in so ur tahoe doesnt get stuffy inside... U can control that wit the A/c and circulation buttons on ur hvac...
But another thing u might want to check is the accuators on the blend doors... Theres like 3 or 4 of them 1 on the blower fan 1 to the right of the gas pedal and the other 1 or 2 behind the hvac in the dash...
But just sumthing 2 think about if its not an hvac unit problem...

 

[SunlitComet]

I am busy getting lost in threads lately even if I reads the thread again. So please again remind me what you see wrong. And what fan did you verify.

 

[MTman777]

No air blows up front.. rear ac works just fine.. i can still control the temperature of the air seeping into the truck thru the vents. When i hit the circulation button it stops all air coming in the front. The front blower motor on the passenger side works.. still need to fix the no air problem..

 

[fyremanpat]

Replace the control

 

[SunlitComet]

Front Ventilation Controls
HVAC Air Delivery Schematics

I have edited these out for now.

Ask if you still want them.



HVAC Air Delivery Schematics: Front Ventilation Controls (Part 2 Of 2)

 

[SunlitComet]

recirc testing:

 

[SunlitComet]

SOB
This posting size limit is pissing me off I am getting tired of having to upload to another server all the time.

Mods or Admin Can a tahoe/Yukon brother get an posting size increase please?

---------- Post added at 12:52 PM ---------- Previous post was at 12:52 PM ----------

 

[fyremanpat]

Dude!!!! I'm telling you its the the fan control switch. Replace the whole thing. You can get them off Ebay for 100 bucks. When you have it out check that there are no charred connections if there is then clean the off and re-adjust the pins.

 

[SunlitComet]

Correct me if I am wrong but it sounds like he does not have a blower/fan control problem. but the recirculate disabled/enabled function is partially working. Have I missed something?

---------- Post added at 02:45 PM ---------- Previous post was at 02:44 PM ----------

Here is some more diagrams for you.

I have edited these out for now.

Ask if you still want them.

 

[fyremanpat]

Yes I am correcting you. I've had this same problem. Its the control.

 

[SunlitComet]

is somebody screwing with my post? A couple of hours later my posted pictures seem to change.

---------- Post added at 11:13 PM ---------- Previous post was at 11:09 PM ----------

Wait that is alldata . Sorry about that.

---------- Post added at 11:42 PM ---------- Previous post was at 11:13 PM ----------

You claim the fan control switch so why would he have to change the whole controller since the switch is alone replaceable?

If you are talking about the disable function triggered by the fan off position I see where you are going however, again the diagram shows the signal is a open or closed ground circuit so if open the air moves freely and depressed it stops I have not choice to think the motor or mechanism is jamming. However if the recirculate test above shows an partial ground signal connection can cause the motor to cut off air supply completely then I will surely correct myself.

MTMan,

Just to clarify my thoughts am I understanding the problem as you see it. If I am wrong please correct me.

 

[MTman777]

Im gonna break this down as simple as i can get it.. theres no power getting to the blower motor... all fuses are good and the blower motor itself is good.

 

[SunlitComet]

No problem I understood it to be that when you enabled recirculate mode it was then when you airflow stopped entirely but the blower was working under it own power. Sorry about that hear are some diagnostic sheets. If they do not look correct let me know I had some weird attachment thing going on lately. I am still trying to find a fix for it.

 

[SunlitComet]

See how these come out.

 

[MTman777]

i wish those things were bigger... kinda hard to read.. lol.. ill see what i can come up with.. thank you..

 

[MTman777]

so im gonna go ahead and replace both the controls and the board tomorrow if i can find them at my local junkyard..