ok im having trouble figuring out why my heater wont work, i have heat when i use the defog setting, but when i change to feet or vent it blows cold air...dont know what to do please help.

 

hmm, almost sounds like the logicon...

but you could try to check the actuator that chagnes from hot cold...
if you reach up towards the center of the dash from the drivers side, you will notice an elctric servo conncted to arm that operates a flap inside the heater ducting - this controls the flow of coolant to the heater core.

If you change the setting from def. to floor or vent or what have you - that arm shouldn't move, it should stay in the same place...if it is moving when you chagne the position then something is wired improperly....

 

I'd be willing to bet it's the logicon as well. You can always check out www.mazdamark.com for good prices on a replacement.