Blower Fan Speed Messed Up!

Discussion in 'GM Electrical Tech' started by agearhead2, Oct 22, 2010.

  1. agearhead2

    agearhead2 New Member

    I recently purchased a 2003 Silverado and have noticed that the blower speed at the 1 setting is faster that the 2 and 3 setting, 4 and 5 are fine. It's almost like the wires have been crossed as the 3 setting has the fan speed one would normally expect for 1 and the 1 setting has the fan speed one would expect for 3. Anyone else had this problem.
  2. Springthing

    Springthing Epic Member 5+ Years 1000 Posts

    MAY be your problem.

    Have a look here.

    Different year but, like I said, might be your issue as well.
  3. Mowerpan

    Mowerpan New Member

    These chevy's are known for the blower motor resistor and wire harness going bag and to replace the wire harness it is required to cut all the wires and use butt connectors to connect the new harness to the wires that were cut off. If you take the glovebox out you will have access to the wires-I would make sure that if you see butt connectors there that all the wires are connected correctly.
  4. Tuff_Truck01

    Tuff_Truck01 New Member

    I recently had a similar problem. I have a 2002 Silverado and what I thought to be a control switch problem, ended up being a burned up blower motor resistor harness. The dealership wanted to bend me over for close to $100... I did some looking around on my own and found one that was only $33! Not only was it way cheaper, but it was color coded to match my original harness. The one the dealership mechanic showed me only had black and white wires and seemed to only have one size wire gauge. I'm no mechanic or electrician, but it seems to make good sense that you would want to match the wire gauges. The one I found did and it came with butt connectors. I found and purchased it at

    My heat/ac works perfect now and I'd recommend that anyone with a similar problem check their blower motor resistor harness along with the climate control switch, resistor, and blower motor (all of which were suggested by the dealership mechanic I went to). Hope this helps!

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