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did all speeds stop working or does it have high only? if none of the speeds are working then you need to verify you are getting voltage to the motor, if you have voltage the motor is out, no voltage check the heater control relay. if it blows only on high then its the blower motor resistor located in the duct work under the dash around the glove box area
I have the same problem with my 2001 Tahoe. The front blower is working, its blowing strong, but its cold air even with the temp setting as high as it can get. The rear blows hot air. The engine temp guage is at about 210ish which is close to being normal (220). I just replaced the thermostate a few months ago, I don't know if its bad again, or it I deluted the antifreeze too much and it frooze the heater core, or if the heater core just went bad. Any one know what the cause could be?