You are dead on the problem. Whether the problem is A or B, the fix is the same. Put a 20kohm resistor on that thermistor clip. The measurements aren't that important, it's the same incorrect Toyota part inaccurate by the same resistance differential all of them are. If you are worried about cutting wires you can stick the resistor prongs in the wiring harness and tape it temporarily (make sure it has contact). The only reason to not leave the circuit jumpered is to avoid icing up, especially in cold weather with defrost on.
It doesn't really matter how much contact the thermocouple has with the evap coil surface, they are very sensitive. If it's in the evap housing and in front of the air discharge it's fine.
I am pretty much 100% certain this will fix your problem based on what you've said.
https://www.amazon.com/EDGELEC-Resis.../dp/B07HDGCGB3
Quote:
Originally Posted by averyislost
It's possible, although I feel like it might be more on the possibility (B) side. I ended up actually replacing my thermistor with a new OEM one, since mine is the earlier thermistor that doesn't clip into the evap core fins, it just rides on the "carrier" that clips onto the side of the evap core housing. I even played around a bit on the positioning of the sensor on the carrier but it made little difference. Only time it ever gets freezing cold is when I jump those two wires.
Mine also makes the same noise with the expansion valve, the "sighing" when the sensor is plugged in.
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