My mate has a 97 wagon wrx and is having trouble with his heater, It is either not on or fully on, no where inbetween. Has anybody had this problem before? If yes what did you do lol. Need to get it sorted really as it getting cold in the mornings now which is good for fully on but after a while you start to melt lol

 

Try the heater resistor mate

 

ok will do