Replaced blower resistor and fuse still melting. I've been throug 6 fuses in as many months. Now the heater & A/C only works when I wiggle the 25amp GM fuse or slightly pull it out. When it works it works well but I am afraid to use it as it gets red hot instantly???
Sound like you have a dead short somewhere. Would have it checked out,could cause car to catch on fire.....better to be safe than sorry......good luck....
SOURCE: 2003 GMC Sierra heater Blower wont shut off
My 2003 Sierra's blower came on by itself in the garage while I was sleeping and ran the battery completely down. I had to replace the blower switch located under the glove box next to the blower at the bottom of the right corner of the dash. The switch is in front of the blower and held in by two screws. Disconnect the two wire connections. This is a "dealer only" part and cost me 65.00. Also check the wire harness with seven wires connected to it for melted plastic. It will be marked "ABCDEFG". If it has melted, you'll need to replace it. Pay attention when reinstalling either part, that the wires "ABCDEFG" match the switch in that order.
SOURCE: 94 gms safari van heater blower not working
This van has a resistor under hood for the blower motor and is the blower motor getting power to it
SOURCE: 2005 GMC Envoy SLE blower fan speed #5 is not working
More than likely this should just be your resistor. You have different sized coils on the back of your resistor for all the different fan speeds. if one of them burns out or breaks then that certain speed will not work.
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
SOURCE: 2003 Chevy AC Fan Blower Motor troubleshooting
first check the fuse or relay.. this will be the cheapest sollution and easiest to check.
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