If you want to test the wires back to N22, I would just ohm them out from the sensor connector for cont. and open/shorts.

Note*

This test is assuming you have not added a bridge resistor modification across the sensor for early cut-in..that voids this test]

With sensor unplugged, go across the blu and brown wires in that connector w/Key Off.
Looking for approx 1.3K.
Now go from Brown to ground.. [ thermo housing is OK]..looking for Cont.
Now go from blu to ground..looking for 1.3 K again.
You may want to flex the harness when doing this test for intermittant short/open , considering the known harness problems on these.

As far as the thermistor goes , instead of subbing the 500 OHM resistance, just take an R value of the Sensor when cold ..it should be extremely high, so that would keep CP out of Default for High Fan. [ like 5/6K]
I only had you do the 500 b/c that is a higher R than threshold for N22.
If you have a high R factor at sensor, you do not need the sub test.
But you do need the wiring test.

__________________
A Dalton