[Bob Kontak]

Just for hip pocket information.

Recently worked on an 05 Lexus RX330. Roughly the same issue. Web searches referenced the same sensor. If you turned your head and coughed the AC would work on high for a bit then nothing but warm air.

Coolant reservoir indicated plenty of fluid. However, radiator had a small leak and big air was in the cooling system. Reservoir did not give a correct indication of coolant level. Confuses wet sensors, I am guessing. Radiator and thermo.

I'll look to see if you can test your sensor. Set the resistance range fairly high. It may be in the thousands of ohms if this is the correct test.