it's probably the blower resistor. pull the cabin filter out to get to the blower. there's 3 wires, red, blue and a smaller gauge yellow. put a meter on that wire and run the blower speed up and down from the dash. the voltage on the yellow should change. if it goes up when blower is on high, and down on low, then you need the resistor. this assumes all 140s are the same, that's how we check it in the u.s. good luck, chuck.