That's great to hear some progress on this problem!
Yes try this sensor because it is quite simple to do and relatively cheap.
If it still does NOT fix the problem it would seem like the electrics / control related to how the a/c reads the signal from this sensor, or some a/c fault itself.
But lets hope this fixes it!
My advice on changing the sensor is not to bother draining any coolant off, but to do it like this:
1) Wait until coolant cold, disconnect expansion tank pressure cap to release any remaining pressure just to make sure
2) Put container under car and put some rags or plastic bags around sensor to try and stop coolant spillage going everywhere.
3) Put expansion tank back on and do it up. This will minimise coolant loss when you remove the sensor
4) Have the new one all ready, undo and remove old sensor and quickly get the new one in. You will lose coolant, but not that much. Probably less than is in the expansion tank
5) Top up, turn heater hot/cold control up to max heat, run engine until normal temperature, make sure no airlocks, overheating or leaks under pressure, all done
6) When engine warms up any spilt coolant will burn off hot places, causing smoke and smell, don't worry about that
Pete
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