THE speed postion low sensor is bad, there is a hi and a low!

 

You need a new blower motor resistor and harness. Replace both.

http://www.motorcity1.com/index.htm

 

depends on if its automatic or manual, run into alot of problems with the wire harness that goes to the blower resistor, they like to melt. the pigtail harness to replace it is available, just need to rewire it. other than that, usually if a resistor is bad then it typically only works on high speed, but have run across with the same issues. if its an automatic system then it can be tricky to diag if you have some weird stuff going on. they like to burn out the blower control processor and run continously.

more than likely you have a burned connector at the resistor, or you have a bad resistor.

 

Thank you all, I found the plug burned at the resistor and changed the resistor and plug and it is working now , Thanks again for all your help.

 

Buy yourself some dielectric grease,,which can be found at any auto parts store. Unplug the plug and put some on the terminals. The grease acts as a heat sink and corrosion prohibiter and can greatly increase the life of the connector.

 

I had this issue on my trailblazer and bought a new blower motor resister from http://www.chevyclub.org/chevy-trailblazer-parts.html It only took about 30 minutes to fix and was fairly easy, I was so glad. I really need that high speed here in the tx summers.

 

My dad's 02 Tahoe has the same problem but it only works on 5 Same fix?

 

Same fix I do believe.

 

There have been blower resistor issues with many GM lines, N,and W cars,and K trucks come to mind. The usual symptom is the blower works only in high. The new resistors have been re engineered and are very reliable.

 

Found this thread in a search. Our 06 Silverado with 50k miles has been acting up for a while now, finally the blower quit all together. Same problem, wires burned up and connectors damaged from the heat. Poor design from GM on this. The wires on mine were melted and stuck together, close to shorting out. Dangerous situation. Expensive parts to fix it too. Resistor and connector with pigtail right at $80. Ouch. Looking at all the posts over the net I'd think this is just about cause for a recall. Anyone reading this with a newer GM vehicle should take note of this and pay attention to the operation of your heater/AC blower.

 

I have to do the same thing to my truck.... annoying, but cheap and easy.

 

2004 silverado is doing the same thing, but i replased the resistor and checked the blower. i unplug the resister and blower and then turn the switch, it blows the fuse. confusing. think it might be shorted in the harness somewhere?

 

checked it and cant see any visiable signs of over heating.

 

I have a 2003 silverado 1500. Can anyone tell me where I can find this Blower Motor Resistor and harness on the truck?

Thanks,

Keith

 

On 90% of car/trucks, they are located on the passenger side, below or behind the glove-box and above where the passenger's feet would be. The resister block is inside the plenum, to help keep it cool and not exposed, real close to the blower-motor.

The other 10% are under the hood on the passenger side firewall.

 

Under the dash beneath the glove box on the right side.

 

i gotta 02 silverado 5speed. my fan switch only worked on 5 then it went out. i read on this forum about it and replaced the blower motor resistor. now speeds 1 through 4 work but speed 5 does not work. i was reading how the wiring might be bad but i checked the plug and theres no sign of wires burnt. could anyone assist me on what might be wrong?

 

There is a 30 amp fuse in the underhood fuse box labeled "FRT HVAC" (#13), it may be blown.

 

I had the same problem only for me it was to late. It was cold out and I ran in to my neighbours to pick her up so I left the truck running. Who hasn't done that ...right??? Well, I left the heat on high and when I came back out to get in the truck, the cabin was filled with smoke!! I ran to the passenger side and opened that door and that is when I seen the flames coming from under the heater. It was ON FIRE!!!! I managed to blow them out. The only warning that we had was that once and a while the heater blower would all of a sudden stop blowing. We would just tap on the bottom on the passengers side and it would start up again. The wires melted and now we have to replace the whole thing!!!! We were lucky that I caught it when we did! By the way, we have a 04 Silverado Chev...and are now looking to buy a Ford!

 

I have a 2001 Chevy Silverado not sure why my blower isn’t getting power to turn on? New resistor and harness for resistor. New blower. The old one burned the harness and the blower motor and burned resistor. Tried a new control module as well. Used a test light to check power and I only have power to new harness at the red wire. Power stops at resistor doesn’t continue to blower wires. Help please?