On some of the GM's the blower motor runs at a low voltage, Gm's idea was to keep the fan at a slow run from seizing due to non use. I have put a switch in some to stop this and still be able to use the fan when needed...this is done by...
removing the blower fan fuse from the fuse panel
attach a fuseable wire to the hot side of the fuse socket in the fuse panel, you can use a flat spade connector attached to the wire
run this wire to a good 20 or 30 amp micro toggle switch in a holder neatly attached under the dash out of sight but easily reached
I use a black plastic holder with a micro switch with a black toggle boot over it (helps to make it not visable)
I attach the holder to the steering column bracket on the left side
then run a wire with a spade connector to the other side of the fuse socket.
On models with the glass fuses I break a fuse and split into two remove any glass left and trim the fuse link and solder the each wire separately to each fuse end and use them instead of the spade connectors to attach to the fuse panel
With the switch in the off possition there is no power going to the fan and when you need the fan just turn the switch on.
With the switch off...This will aslo help with reducing heat coming in to the car
Hope this helps
John
