GMC - Sierra :: 2005 - Blower Fan Would Not Run On Highest Setting


Apr 4, 2012

So I have a 2005 GMC Sierra 1500 pickup that is in great condition. Recently, I have noticed that in the mornings on my way to work the blower fan would not run on the highest setting. After a while of driving, the highest setting would then work. This happened for about two weeks. Now, the blower will not turn on at all on any setting. Thought it might a simple fuse, but that looks fine. Should I take it to the shop? Could it be the blower motor that needs to be replaced?

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Where is the resistor located? This video shows me for a 2002 Ram 1500 van. Will it be the same on the 3500?

I've learned here that sometimes resistor failure results from bearings going bad in the blower, causing excessive current draw. Is there a way to test that other than with an ammeter? What's the correct current?

2a. If the blower motor is going bad, is that something we'll be able to replace ourselves? (Yes, I should tell them to get a Haynes or Chilton.) I don't like the idea of taking off dashboard panels.

2b. Is there any other "prime cause" I should look for if the blower motor seems OK?

Are there any other parts (other than the switch) whose failure would also give that symptom?

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Perhaps resistors knock the current down for the lower settings and they have failed? Just a wild guess....

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