SOURCE: Blower Motor works erratic. If
Neither relay nor resistor if handling the wiring harness makes it cut in and out.
It is either a connection in the harness, cut insulation in the harness, or broken wire in the harness.
Try different speeds. If it is all speeds, then it is the ground connection that is erratic.
SOURCE: problems with blower motor resistor
having same problem . no burnt resister or wires but no fan
SOURCE: 2006 Hummer H3 a/c & heater fan/blower failed
Probably too late now, I am sure you have already fixed it, but mine did this and it was an electrical part that is mounted right beside the blower fan. The part was OK, but the plug into the part was arcing and burned out the connection. A Chevy mechanic told me this has been happening to MANY Chevy products. I had to buy a new part and plug assembly with new wires, about 100 dollars, and I spliced them together. It was an Easy fix, but I shouldn't have had to do it :(
SOURCE: 7 wire harness going to blower motor resistor
There is an updated resistor/connector package. Very expensive from GM, try your local NAPA or other parts supplier for a replacement
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