My heater turns on but wont blow out air what is worng with it?

The blower motor on those vehicles comes as a modular assembly, it incorporates the control module (built into motor assembly) which controls blower speeds. They have a lot of problems with these units.

It seems your saying you can hear the air rushing out of the vents but It is not hot. If that is the case, check your coolant level. If you have a bad thermostat that opens too early, It will keep the water temperature from getting hot enough to go through the heater core and the cold air rushing through the core will not dissapate the heat from the heater core. So, first check you have sufficient coolant in engine. Do not remove the radiator cap when engine is HOT. Check it when IT is COLD the level is clearly marked. If you can feel rushing air with your hand at the vents and It I cold. The remote possibility is the A/C is mixing with the heated air. This would require a shop to check for broken or misaligned parts that control the A/C and heated air being directed through the vents.