The Proton Saga / Iswara Thermistor Sensor (Denso 077500-0920) is an authentic Made in Japan temperature sensor used to monitor the evaporator core. It works in tandem with the AC amplifier (like the Denso 077300-0751) to cycle the compressor and prevent the system from icing over.
 

• Part Number: 077500-0920
• Brand: Denso (100% Genuine Japan)
• Connector: 2-Pin socket
• Application:
  • Proton Saga (Magma / Megavalve)
  • Proton Iswara (1.3 / 1.5)
  • Proton Saga LMST (certain batches)
• Compatibility: Also fits several vintage Mitsubishi models (Lancer C12/C14) that share the same cooling box design.

Technical Verification
The "Icing" Symptom: If your Iswara’s AC airflow turns into a tiny trickle of air after 15 minutes of driving while the blower is at max, this sensor is likely faulty. It is failing to tell the amplifier to cut the compressor power, leading to a frozen evaporator.

• Installation: The probe is designed to be inserted directly into the evaporator fins. Access is gained by removing the glove box and opening the clip-on cover of the cooling coil housing.