What works fine:
-If it's quite cold outside
-If it's quite hot outside
-It seems to work better after having driven for 15-30 minutes

The problem:
When starting the car on a 15C/59F day, driving off in the sun, the cabin is quite warm, but the A/C blows hot air. I have the A/C control at 22C/72F all the time. It soon gets annoyingly hot. If I turn down controls to 18C/64F, much colder than I ever had before, I get nice temperature in the cabin

Does anyone else have this issue? I believe the ambient air sensor as displayed is correct. But maybe the in-cabin air sensor?

"CABIN HUMIDITY AND TEMPERATURE SENSOR
The cabin humidity and temperature sensor is installed behind a grill on the drivers side of the
instrument panel. The temperature inside the cabin is measured by a NTC (negative temperature
coefficient) thermistor. A motor within the sensor assembly draws cabin air in through the grill and
over the thermistor. The motor is provided a battery voltage feed by a relay located within the CJB
(central junction box) ."

?

Clean our the sensor! These things get nasty with fuzz and grime. Bucks-to-'Nuts it'll work fine after a delicate clean job.

Thanks, I'll try. "Bucks-to-'Nuts" meaning?

"Dollars to Donuts".

- - yourdictionary dot com - -

Bet-dollars-to-donuts meaning

(idiomatic) To suggest that something is very likely to be true or that one has a strong hunch about something. Related to the earlier 'bet dollars-to-buttons' and 'bet dollars-to-dumplings' that appeared in the 1880s, meaning 'almost certain' because the dollars are bet against something near worthless, and perhaps zero shaped.1996. "Now I'm willing to bet you dollars to donuts that out of every twenty stills in the county, the ATF boys know, personally, at least nineteen operators." Virginia Lanier, Death in Bloodhound Red, p. 38.