before you start laughing, I know this is a simple operation, but some folks haven't changed out blower motors as many times as the rest of us. I figured I'd help out all those in the "fan does not blow" boat.
If your heater/air conditioning fan has a mind of it's own or if the blower motor only works if you hit it with a blunt object, then this is the fix.
First of all buy a new blower motor. You can find them new for between $160 and $220. I'm sure some of you can find a better deal. Personally I think the prices of the 97+ fans are insane. I remember getting the old style ones for next to nothing.
Next, if it's this cold out find a heated garage.
The tools you need:
1 1/4" ratchet with an extension and an 8mm socket.
Now, you should disconnect your battery. I chose to live dangerously and skipped this step.
Locate your blower motor. It's under the hood on the passenger side firewall. Reach in and pull out the plug.
Remove the three screws (the brightly colored stars highlighting their positions) holding the fan in.
Now it's time to remove the fan.
This can be a bit tricky, but if you think of it like a chinese puzzle and get the flanges for the screws out around the wire bundles, you'll be ok.
There, one crap motor and fan.