This is for a 1998 Bravada
I found my Bravada has ATC ( auto temp control) and it's making finding a blower motor very very hard.
First.. it has three prongs, not two
Second, Every single connector I see online looks different than mine. Factory part no. is 52477150

If anyone has a work around with this, please let me know. The third wire is NOT a ground according to one post, and it does make sense since they made darn sure to separate this wire and sell different blower units. All blower units I can find that say they are ATC, have no third prong.

 

I had no trouble with finding a replacement for mine with the ATC. The new motor did not have a stand-alone ground connection that the original had. I now have a single wire that is now is loose.

A bit of advice: try to reuse the original drain tube. The one that came with mine was hard to bend to the proper shape.

 

Interesting, because the info I had seen said they lost all kinds of functions once that wire wasn't being used.

 

If you like I can try to track down the pdfs of my receipts and find the part number I used.

I might also be able to find tbe electrical schematic for it too.

 

A schematic would be cool.

I can find a few used ones on ebay. Alternate part no. for that is 615-00576 in case someone finds this thread in the future.

I examined my issue, squealing when cold, and surprisingly there is a hole to what appeared be the problem bearing and I dripped in some thick oil and now it's quiet.

 

In case you did not see my reply to maxvamp, here is the part that describes my understanding of the circuit and the replacement part I used. (I just now noticed it was from 2015. Ack!)

 

I have noticed the same thing while looking for a blower motor for my 99. I parked the blazer for a few months as I had a civic I was using, and the blazer became the tent trailer puller.

My blower motor seized over that period, and when the mechanic tried to find one and couldn't, i tried and failed. Scrap yards and online it didnt matter. My mechanic ended up opening it up and found soaked it with wd40 over and over for a couple of days, and luckily has been working fine since. I have yet to come across a three prong yet, but I'm grabbing it when if I find it lol.

Not my controller is starting to die on me... lights are going out and the temp isnt accurate.

 

Here is the schematic that I have from my 2000 Bravada FSM and it shows things a little differently than Christine's schematic which I think is helpful as it shows the separation between the blower motor & the blower motor control module. We can see the three wires here to the actual motor and what they represent. The two most important wires are the purple & black wires which go back to the blower motor controller. The brown wire is just a ground wire and can either be left off or used to ground the case of the fan itself if you are making up a 3-pin to 2-pin adapter harness. My references state Delphi Metri-pack 630 series connectors for the blower motor in 2000 and I would assume that holds true back in 1998 as well, but you might want to check ( & links for your viewing pleasure).

My approach would be to de-pin the 3-pin connector, swap the purple & black wires over into a 2-pin connector to plug directly into the fan, then cut & splice a proper spade terminal onto the brown wire to mount to the ground spade on the fan housing. If you didn't want to damage the factory wiring, you could make a jumper harness from a 3-pin connector that would adapt from 3-pin to 2-pin and brown wire with spade terminal.

Hope this helps!


2000+ Automatic Climate Control Schematic

 

Wow, that is crazy. So one year it shows a sensor, the very next it grounds the same wire. Why not just eliminate it all together? And if it doesn't matter, why not make one universal blower motor instead of having ones specifically saying they are ATC, yet they don't have any extra spade connectors?

 

That symbol shown denotes a speed controller (potentiometer really), not a thermistor or overload sensor. It likely is just denoting the fact that the motor controller is in the loop there. The fact that the older schematic smashes the motor & the motor controller into the same block even though they are two separate devices leaves a bit to be desired.

CLICK HERE for the replacement AC Delco blower motor control module courtesy of RockAuto mainly to show the image below:

1998 Replacement Blower Motor Control Module - ACDELCO 158752

Note the wiring. Replacement fans should have a spade off to the side of the electrical connection for the ground attachment. So basically, they did simplify it in the later years and made it backwards compatible to the earlier years. It just wasn't very clearly detailed. Hopefully it is now.