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2006 Silverado 1500HD heater blower working, no airflow


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thisisdoors
User

Nov 26, 2016, 11:43 AM

Post #1 of 30 (2908 views)
  post locked   2006 Silverado 1500HD heater blower working, no airflow  

I had the problem that a lot of people have had with their blower motor resistor. basically, all of a sudden, your heater blower stays on ALL THE TIME, and you have to pull the fuse and replace the Blower Motor Resistor.

So, I went to change it out, and i found out that since i have the HD model, there is AUTO temp control, so i had to buy the $90 one. Ok, so i did that, and replaced it. Well, now the blower motor doesnt stay on all the time, so that's good. The problem now is there is no vent control, and no air coming out of ANYWHERE. I have FULL blower control, with all the fan speeds working, but no air. I know the blower is working, because I can hear it doing what the control panel is telling it to. I can feel the heat, and if I let it sit for long enough it will warm up in the cabin, but it's just from air seeping out, not from any legitimate airflow. I am seriously losing my mind with this truck lately... any suggestions would be really great. also, is it possible that the new motor resistor, while fixing the heat-staying-on issue, somehow is the wrong resistor, and maybe causing something else to go haywire?? I got it at Autozone, so i doubt that it's the wrong model, but still....thanks


(This post was edited by thisisdoors on Nov 26, 2016, 11:51 AM)


kev2
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Nov 26, 2016, 12:15 PM

Post #2 of 30 (2881 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

ATC is a complicated troubleshoot... simple easy first.
Do you have fan speed control ?
You have NO airflow - defroster, vents or floor?
The Module will light up, AC is off, nothing blinking?
Have you checked - fuses? fuses Underhood also
A hail Mary -Try removing (30seconds) the HVAC/ECAS A 10amp for a reset.


Do you have a scanner


Tom Greenleaf
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Nov 26, 2016, 12:16 PM

Post #3 of 30 (2881 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

I'm reduced to some serious guessing with climate/auto air in a truck like that.


Sometimes the duct choice which is diverter doors the actuators can or will default to fully closed when power is 100% lost and stick there - not yet on me just hear of that with GMs more than others for unknown reasons.


See if everything is really plugged in after the resistor job and back in place of course and while there see if actuators are actually moving. Strong guess the air flow control actuator is on the driver's side - a guess for sure and may be very hard to see it move without mirrors or taking things out of the way.


If you can just get a hand on them nudge a tad at rods or listen for actuators trying to move when you request changes. Some direct and some thru or via rods to the lever for an actuator door.


Careful. Some of that can be quite fragile stuff and break on you which really causes foul language!
Mad


T



Hammer Time
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Nov 26, 2016, 12:22 PM

Post #4 of 30 (2877 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

Why don't you try disconnecting the battery for a few minutes after you have verified all the fuses. That will recalibrate all the doors.



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thisisdoors
User

Nov 26, 2016, 4:25 PM

Post #5 of 30 (2854 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  


In Reply To
ATC is a complicated troubleshoot... simple easy first.
Do you have fan speed control ?
You have NO airflow - defroster, vents or floor?
The Module will light up, AC is off, nothing blinking?
Have you checked - fuses? fuses Underhood also
A hail Mary -Try removing (30seconds) the HVAC/ECAS A 10amp for a reset.
fgb
Do you have a scanner



no scanner.... do you think the cheap scanners at the auto parts places can catch a code with no check engine light?

and yea, all the rest of what you typed is accurate. AC is off, no blinking lights, full blower control on every speed, just no airflow out of ANY vents, floor defrost or dash. and i did check fuses, they all looks great. well, 4 total. 2 under hood, 2 in dash drivers side.



(This post was edited by thisisdoors on Nov 26, 2016, 4:33 PM)


thisisdoors
User

Nov 26, 2016, 4:42 PM

Post #6 of 30 (2838 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  


In Reply To
Why don't you try disconnecting the battery for a few minutes after you have verified all the fuses. That will recalibrate all the doors.




i had the battery out for something else for about an hour today..... nothing



Hammer Time
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Nov 26, 2016, 4:45 PM

Post #7 of 30 (2829 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

Let me ask you something. Was this new module plug and play or did you have to splice wires?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



thisisdoors
User

Nov 26, 2016, 4:53 PM

Post #8 of 30 (2824 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  


In Reply To
Let me ask you something. Was this new module plug and play or did you have to splice wires?


splice. I have experience with it, so i know the quality is there. Also, everything was like colors to like colors... red to red, black to black, tiny purple to tiny purple.
but the old one was a plug. so i basically cut out and bipassed a plug. it was the only option i could find and i looked at a few places. it may be whats causing this though.... what to you think?

EDIT::: I go this part from autozone, and they gave me a list of ones that would work. im not saying they're always right, because theyre not, but all of the options i had involved rewiring, so it's not like there was one with a plug i could have bought. BUT ALSO, there were manual and AUTO resistor options. I have an AUTO, but all of my model truck have AUTO. why would manual be showing up as an option??? sorry if that's confusing.(auto climate control)



(This post was edited by thisisdoors on Nov 26, 2016, 5:01 PM)


Hammer Time
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Nov 26, 2016, 5:01 PM

Post #9 of 30 (2802 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

I'm not questioning the quality of the splice.

Try this, un-splice the 2 wires going to the motor and reverse them. What I'm suspecting is the wires are backwards and the motor is running backwards.
You can't rely on color with these aftermarket parts.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Nov 26, 2016, 5:02 PM)


thisisdoors
User

Nov 26, 2016, 5:04 PM

Post #10 of 30 (2796 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  


In Reply To
I'm not questioning the quality of the splice.

Try this, un-splice the 2 wires going to the motor and reverse them. What I'm suspecting is the wires are backwards and the motor is running backwards.
You can't rely on color with these aftermarket parts.


here's the thing... the wires going to the motor were plug and play. it's the incoming wires that i spliced. could reversing those ones, cause the fan to run backwards? or could the outgoing wires, which go to the blower fan, have come from the factory reversed?



Hammer Time
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Nov 26, 2016, 5:08 PM

Post #11 of 30 (2774 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

Only the ones going to the motor.

Try this then. Locate the inside air intake, start the engine and put it on max AC then take a plastic bag and up to the intake see if the fan tries to pull it in.

If the fan tries to push it back out, it's running backwards.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



thisisdoors
User

Nov 26, 2016, 5:30 PM

Post #12 of 30 (2757 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  


In Reply To
Only the ones going to the motor.

Try this then. Locate the inside air intake, start the engine and put it on max AC then take a plastic bag and up to the intake see if the fan tries to pull it in.

If the fan tries to push it back out, it's running backwards.



i dont know where the intake is, but i did the redneck test, and put the bag up to the vents, and it has pressure going the correct direction.

ALSO: the controls seem to be working a little. if i have it on floor, the heat will leak out of the floor vents only. if i change it to dash vents, you can hear a little bump, then the air only leaks out of the dash vents. so something is directing the airflow, and i can here the blower working at all of the speeds, but there is still a major block somewhere. It cant be the filters, because i was getting perfect flow before the issue.



Hammer Time
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Hammer Time profile image

Nov 26, 2016, 5:59 PM

Post #13 of 30 (2742 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

Checking the dash vents proves nothing. The intake is under the dash on the right side, possibly behind the glove box. It has to be set to max ac to open that flap.

If this all happened as a result of changing the blower speed module, then that is where the problem is.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



kev2
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Nov 26, 2016, 6:23 PM

Post #14 of 30 (2731 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

thinking out loud...
the fan is running you can hear that SO high fan the air will be moving - its going somewhere....
and with doors closed there is often a whistle, mode door cannot close all paths....
Is there a HVAC filter this model?
you did check fuses not just look?
Did you try the suggestion to remove power to HVAC.. 10amp ECAS
scanner will need to be all module capable B series as well as U
- I think there was a issue with electrical wires or contacts in the multi wire connector.
Any wiring involved or was it a plug in
did you maybe miss wire the 2 wire connector? or the 7wire connector


(This post was edited by kev2 on Nov 26, 2016, 6:28 PM)


thisisdoors
User

Nov 26, 2016, 6:39 PM

Post #15 of 30 (2720 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  


In Reply To
thinking out loud...
the fan is running you can hear that SO high fan the air will be moving - its going somewhere....
and with doors closed there is often a whistle, mode door cannot close all paths....
Is there a HVAC filter this model?
you did check fuses not just look?
Did you try the suggestion to remove power to HVAC.. 10amp ECAS
scanner will need to be all module capable B series as well as U
- I think there was a issue with electrical wires or contacts in the multi wire connector.
Any wiring involved or was it a plug in
did you maybe miss wire the 2 wire connector? or the 7wire connector

---------------------------------------------------------------------------------------------

i just looked at the fuses,tomorrow i can check them with my meter

not sure if there's a filter, i cant find one. i cant even find the cabin air intake.

I agree that the air must be going somewhere, but i cannot find where. it just slowly leaks out of whichever vents are selected. so it's trying to route the air....

yes i removed the 10 amp HVAC/ECAS for 30 seconds, nothing

and no, i didnt miswire it, because the only thing i wired was the power wires going INTO the resistor. the wires COMING OUT of the resistor, to the actual blower,
came wired into a plug already.

I gave the guys at autozone my make and model, and a list of resistors came up... then i chose one based on the fact that i have auto temp control. but i cant help but feel i got the wrong one.... especially after the other guy's comment that since these issues came up after the swap, they have to be related.



Hammer Time
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Nov 26, 2016, 7:54 PM

Post #16 of 30 (2702 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

Yeah, and those Chinese never make a mistake.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hammer Time
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Nov 26, 2016, 8:20 PM

Post #17 of 30 (2694 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

Here's the plug diagram. The purple should have the power and the black will be ground.



Here's a diagram from an auto temp control system and it shows the module as part of the blower motor. Are you sure you have auto temp control?





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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Nov 27, 2016, 9:08 AM)


thisisdoors
User

Nov 26, 2016, 9:41 PM

Post #18 of 30 (2686 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

yes, my control panel has a button that says "auto" and if you press it, it controls the stuff itself. I'll check that plug tomorrow for power in the right place

ok, im a little rusty since my days of reading P3 Orion wiring diagrams.... but im not seeing a resistor anywhere on this diagram... is it maybe c16 or c206? on the truck, somewhere between the dash controls and the motor is a blower motor resistor. that's the part i changed initially. coming from the dash is a red and black, and that connected to the stock resistor with a plug. then the resistor had a purple and black line coming out.(both in and out also had tiny grounds)... The only red line i'm seeing on that diagram coming from the dash is saying it's for rear controls... there are no rear controls in this truck. this diagram shows grey/black as going to the blower motor, and i dont see grey/black anywhere near the fan on the truck...

here is a pic of me pointing at an unkown thingy(door actuator thing i think...)...lol the ACTUAL resistor is to the right of where im pointing. you can see, no grey/black wiring, just red.

so is this the right diagram? or maybe eve though it says AUTO on a button, and that controls the temp and blowers, maybe its not an auto one?




(This post was edited by Hammer Time on Nov 27, 2016, 9:02 AM)


Tom Greenleaf
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Nov 27, 2016, 12:23 AM

Post #19 of 30 (2670 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

I think you have the wrong resistor! OMG - AZ (Autozone) is nearest parts outlet to me now and do go there WITH the old parts and match up at counter.
Their own look ups are different than on line for me and when something is listed WRONG it seems to stay wrong forever. This case the staff is exceptional, the outlet is what it is.


I see a part down the list of 13!!!! resistors for this thing. This one looks like the one you should need and this can be wrong as you said and I notice all the time what is listed isn't correct thru them. I think I'd be at a dealer with VIN for this.


Link for the page of what looks to me like the right part?
http://www.autozone.com/..._4222/?checkfit=true


Don't get too excited as that could be wrong too! Pic will show seems to match your OE harness with just three ready stripped wires to do better than I see in your picture - solder and shrink wrap those but WHEN it proves to be right not before IMO.

IDK yet again. This shows the purple and black wire off to the blower if you believe this pic at all - it's not funny they can be wrong.


BTW - if back when mentioned blower is turning backwards it seriously will not blow air worth a damn. If correct I think all heat requests draw air from up by wipers always and recirc on max request or faster A/C or defrost modes would draw air back from under dash. HT mentioned use of plastic food wrap and think that would be a good test but the point is I think you have the wrong resistor! Right one is $30 more if that's correct!!!!


T



Hammer Time
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Nov 27, 2016, 5:02 AM

Post #20 of 30 (2665 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

That's because what you have on ATC is not a resister. It's a control module that takes it's place. What you are pointing to is the blend door actuator for temp control.
The actuator for mode control is on the left end of the HVAC housing, accessible from under the driver's side of the dash. You can observe that while changing modes to see if those controls are working.

I still say that if this problem only came up after replacing the speed control module, the issue has to be there somewhere and the motor running backward will give you those exact symptoms.

Maybe you could just use some jumper wires to try reversing the polarity at the motor for testing purposes.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Nov 27, 2016, 5:08 AM)


kev2
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Nov 27, 2016, 7:47 AM

Post #21 of 30 (2649 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

pictures - great, add one of the HVAC controls will end this ATC manual or ? issue..... or if you have the RPO list.
Try confirming fan wired correct - close all vents except 1 - set mode to vent, fan on hi is that open vent sucking or blowing?
And maybe list the colours of the wires to resistor aka module


Another possibility - blower motor running, fan not being driven,


(This post was edited by kev2 on Nov 27, 2016, 8:28 AM)


Hammer Time
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Nov 27, 2016, 8:46 AM

Post #22 of 30 (2633 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

Why does he have to list the colors of the wires to the module? He just gave you a picture of them.

I seriously doubt there is any issue with the blower motor itself since it worked fine until this module was changed. We seem to be just confusing things more than helping here.


OP, I deleted your picture because it was too large and causing the window to stretch sideways. Please reduce the size of any pictures in the future.


edit
I resized it and put it back. Probably a little too small now but it will do the trick.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Nov 27, 2016, 9:03 AM)


thisisdoors
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Nov 27, 2016, 9:06 AM

Post #23 of 30 (2615 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

Mr. Greanleaf: Im going to go to the dealer when theyre open and see which part they recommend. the picture you put up is the EXACT model i bought, so that's a good sign.

HammerTime: reversing the polarity scaaaares me. but if i check the plug and it's wired correctly (ppl= power) that should mean the motor is going the correct direction, i think.... right?

Kev:


I did your vent test, and air is blowing, not sucking out of the dash vent, which is good.

I really like your idea of the motor running but not activating the fan. that never occured to me, because i just figured the motor and fan assembly were one unit, but if that's not the case, that might be exactly what's going on.

STOCK WIRES WENT LIKE THIS:
From control > resistor = Red, Black, Tiny purple
From STOCK resistor > blower motor = purple, black

here is the RPO codes


seriously guys, i really appreciate all your help with this!


Hammer Time
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Nov 27, 2016, 9:10 AM

Post #24 of 30 (2611 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

You don't have to be afraid. All it does is reverse the rotation of the motor.

Yes, you could check for power but it has to be unplugged when you do.


Yes, CJ2 indicates an ATC system but I did just find out I've been looking at the wrong year diagrams.








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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Nov 27, 2016, 10:30 AM)


thisisdoors
User

Nov 27, 2016, 9:39 AM

Post #25 of 30 (2596 views)
  post locked   Re: 2006 Silverado 1500HD heater blower working, no airflow  

now i see what youre saying.... if i'm reading this correctly, the "resistor" i replaced is the "blower motor control processor" which you've been saying....

SO, since i bought a resistor(see pic):


that would make this the wrong part for sure, which is what Mr. Greenleaf was saying all along. IF AND ONLY IF IM READING THIS RIGHT lol






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