Heater quit working/blowing

[iboughtatahoe23]

2014 Tahoe 179,000 miles… I was on the way to work and I was smelling what smelled like dirt coming from vents like dirty dusty air. I did a pull on the highway to pass someone and after that the AC was on for some reason and All air quit blowing in the front nothing was working. The rear air is still blowing. I’m guessing it’s the blower motor since the back one is still blowing


I was thinking, maybe I would check the fuse on my lunch break, don’t really have time for the blower motor and I don’t know where the resistor is located.

 

[iboughtatahoe23]

I imagine if the rear blower motor is working that the resistor is probably OK? Unless there’s more than one resistor

 

[iboughtatahoe23]

Let me know if y’all want me to check anything before I go pull the trigger on a blower motor

 

[mikez71]

Front blower motor and resistor are under your glovebox.
Need to remove underdash cover (3 screws, one near the middle)
When you take that cover off, you will see everything.

 

[iboughtatahoe23]

Front blower motor and resistor are under your glovebox.
Need to remove underdash cover (3 screws, one near the middle)
When you take that cover off, you will see

thx ill check it out, anyhting in particular i should be looking for? wanna make sure im doing the right thing

 

[Doubeleive]

thx ill check it out, anyhting in particular i should be looking for? wanna make sure im doing the right thing

you can take the blower motor out and apply 12v to test it. If it spins then you can lean more towards the resistor being the issue. but check the fuse of course.

 

[iboughtatahoe23]

you can take the blower motor out and apply 12v to test it. If it spins then you can lean more towards the resistor being the issue. but check the fuse of course.

When you say apply 12v to it, what do
You mean.

 

[Doubeleive]

When you say apply 12v to it, what do
You mean.

use a couple wires connected to the battery and touch the 2 pins in the blower motor connector. if it spins then it is good
if the connector looks burnt or melted then that's a sign of the motor being bad or going bad, happened to mine. started to melt a little bit and lost the connection and stopped working. so I grabbed one from the junkyard and cut the wires for the connection then disassembled the connector and replaced it also instead of cutting my wires. the pins were fine it was just the plastic that melted.

 

[iboughtatahoe23]

what is this piece or duct coming out the side of the blower

 

[iboughtatahoe23]

View attachment 453695
How tf u get it out??? Every video. I watched it looks like someone popped a clip and it rotates. This does not look anything like that.

Whatever that vent is on the left there that goes off to the center console. I accidentally snapped that too. No idea what that is.

 

[iboughtatahoe23]

some piece attached to the housing runs to the center console like snapped

 

[iboughtatahoe23]

I snapped whatever that is. It like snapped off the blower motor. And like connects to the center console

 

[iboughtatahoe23]

Not even sure what that piece is that I broke I keep looking at videos and I don’t even see that piece on other people’s Tahoe’s

 

[iboughtatahoe23]

My bad y’all I was doing this on my break so I was in panic mode thinking I broke something but it’s all good. Turns out it’s just part of the blower motor and it only snapped on one area so I was able to glue it back on.


But just an update while I’m here, I tested the blower motor on the battery still works… So grabbing a multimeter and I’m gonna check the connections and go from there

 

[Doubeleive]

My bad y’all I was doing this on my break so I was in panic mode thinking I broke something but it’s all good. Turns out it’s just part of the blower motor and it only snapped on one area so I was able to glue it back on.


But just an update while I’m here, I tested the blower motor on the battery still works… So grabbing a multimeter and I’m gonna check the connections and go from there

that little duct on the side of it is a cooling duct, the air blows into the blower motor from the airbox to keep the motor cooled, other blower motors are self-cooling and do not use the duct. just depends on the vehicle I have pulled the motors from the junkyard with the duct and others without it (self-cooling)
the resistor is right there to the left, has 2 screws they are either 5.5mm or 7mm. the power connector to the blower motor comes from the resistor.
voltage may show less than 12v at the connector depending on the fan speed setting on the main control, if you turn it up to high it should show pretty much 12v

 

[Doubeleive]

if the resistor has failed it will be the 1st one I have seen on the gmt900's they made them pretty beefy compared to the gmt800's which failed often.

 

[Doubeleive]

old style gmt800 vs the new style gmt900

 

[iboughtatahoe23]

if the resistor has failed it will be the 1st one I have seen on the gmt900's they made them pretty beefy compared to the gmt800's which failed often.

Yep it was the resistor. Apparently it happens a lot. I see a lot of videos on YouTube.

 

[Doubeleive]

Yep it was the resistor. Apparently it happens a lot. I see a lot of videos on YouTube.

for the gmt800's yes, yours is the 1st one I have seen on this forum for the gmt900's

 

[iboughtatahoe23]

for the gmt800's yes, yours is the 1st one I have seen on this forum for the gmt900's

My old one was pretty corroded. Probably from when I left my sunroof open in a rainstorm when I first got it.

This all explains only the rear blower motor working… resistor being bad should not allow power to the blower motor to prevent fire right? Which was my case