Subaru LEGACY 2002 Quick Reference Index page 520

AUTOMATIC AIR CONDITIONING
HVAC System (Heater, Ventilator and A/C)
H: BLOWER SPEED CONTROL POWER TRANSISTOR
The base voltage of the power transistor changes according to blower drive signals from the ECM.
The blower speed changes steplessly in accordance with the change in the power transistor's
base voltage.
Should an over-current occur, the thermal fuse connected to the circuit (rated to blow at 144°C
(291°F)/LHD, 119°C (246°F)/RHD) cuts off the current to the blower.
I: EVAPORATOR SENSOR
The evaporator sensor detects the temperature at the evaporator outlet and sends the result to the
ECM.
B4H1321A
AC-48