blower motor resistor
when i bought the car back in april of 07 the ac ran fine for about 2 weeks and all of the sudden it would only blow on full blast so it was suggested to me to check the blower motor resistor and sure enough i pulled it out and it was all rusted to ****! i replaced it and never had a problem after that! unitl about a month ago i went home on leave and to my suprise i had the same problem, only blowing on high, pulled the ol blower motor resistor out again and what do you know rusted again! i could just replace it again but i would like to know if anybody has anyideas on what could be causing the rust?