It does not use the same blower motor. The A/C is a separate unit with separate controls.
Are you using the A/C controls to try and get heat? The following is a pic of the AC controls. Do not use these.
You need to be using these:
Move the bottom lever over to Warm, you should see this gate move:
Next move the top lever to either defrost or "heat". The blower will come on. Use the verticle lever to turn the blower up more. If you are still having problems let us know what.
btw - "heat" is basically floor. We have vents for defrost and floor thats it for heat.