My car is not overheating or running weird. Just the A/C compressor not kicking on. Many owners have reported code 1231 (ECT sensor) when running diagnostics for A/C not blowing cold. No one mentions replacing this sensor as solving their problem, or the part #. Online OEM part sellers have no code fault knowledge and ECT sensor is not something that means anything to them.

Can someone provide some useful information here please?