Blower motor not working

Hello,

It sounds like the blower motor when out or the relay is having an issue lets use this guide to help test the blower motor and to test the relay. I have included the blower motor wiring diagrams and relay location below.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

Im not sure if the smell is from the motor. Yes I do have a multimeter.

Then check to see if the blower motor is getting power. It canbe a ballast resitor, switch, or the motor itself

Make sure you check it when the blower motor is inop and check the power feed to it and the ground by them self not together.

Ok I took apart the blower motor resistor and plug and found the molded end of each melted. Not sure if it happened from loose connection or something else?

No it's probably from the blower drawing to much power you should replace it.

Thanks for this post I had this problem and hed to replace the blower motor.

Electrical problem
2006 Chevy Trailblazer 6 cyl Four Wheel Drive Automatic 42k miles

I know the hi blower fan is usually controlled/protected by a seperate fuse or fusible link. My glove box manual makes no reference to this. Where can I find the fuse/fusible link/relay etc that controls the hi blower.
Thx Cory

Hi Cory,

The Blower Relay should be located in the Under Hood fuse block.

Also, it usually work the other way around and the only fan speed that works would be the High. However, have you check out the Blower Motor Resistor? It is located under the passenger dash in the duct work near the blower motor.

.

So your saying there is no seperate fuse protecting the hi blower? Seen that for years on GM cars. How exactly do I check out the resistor? Any chance of a pic?
Thx Cory

Here is the test proceedure.....

You can press your "ctrl" key and the "+" key to zoom in to see if you can read it any better. if you can't let me know and I will email the pics to you...

Here is a pic of the resistor location...

.

2003 Chevrolet Trailblazer. Blower motor not working in all speeds, have already replaced the resistor could it be the switch

OK,
had a warm day today so I decided to test things according to the info in the last post. It turns out if I "jiggle" the multi wire plug that goes into the resistor assembly the hi blower comes on. Doesnt appear to be one of the wires going into the plug but the assembly itself. Can that assembly be replaced by itself or does the whole blower motor have to be changed?
Cory

Could be the blower switch and blower motor itself-

You can replace just the blower resistor there should be only 2 screws holding it in.... here is a pic of the resistor...

.

I have a 2005 trailblazer. It has a front ac/heater fan and a rear one. The had completely quit blowing any air form the ac, heater and defrost. My back one still works fine. Can you please tell me why what may have quit working to cause this? Can you also tell me the part I would need to replace. My warrenty is up by just 6000 miles.

This system, especially if auto temp control, is quite complicated to test even with the right scantool, if you have a warrantee, don't walk, RUN to the shop.

If you cant hear the blower motor, start by checking all fuses. Then use a test light to check for power at the blower motor when it is turned on, in all fan speed positions. If there is power but no blower, then the motor is bad.

Electrical problem
2003 Chevy Trailblazer 6 cyl Four Wheel Drive Automatic

The fan acted strange one day then quit working all together the next. None of the selectable speeds turn on the fan. I checked all the relays and fuses under the hood, nothing was wrong there. With the hood open I turned on the climate control defroster and heard the a/c compressor turn on. What should I do next to find out or narrow the probable failures down.

Place heater fan at hi
disconnect blower motor and check for ground and battery volts at the disconnected wire if you have both remove and replace blower motor
if not suspect blower motor speed resister
Blower Motor Resistor Assembly Located Below right side of dash, near blower motor