If you have automatic climate control the sensor/switch may be faulty. It is located under the instrument panel and can be tested with an ohmmeter.
I’m happy to assist further over the phone at https://www.6ya.com/expert/kim_3202917d7c587455
The blend door actuator has likely failed. Unfortunately, it's a real pain to replace. There is a procedure at the link below.
Repair Guides Blend Door Actuator Removal Installation AutoZone com
SOURCE: Climate control is stuck at 18 degree celcius, fuses are all fine
I had that, got a new unit from incurance company scrapyard for $80, changin it was $20 and when opening the old one (the knob is a potentiometer) there was just excess oil between contact surfaces... Local M dealer gave me an estimate of $1500+job
SOURCE: 02 Jaguar S Type - Heater blowing cold air
Has the vehicle overheated recently, if not there is a failure of the Coolant from engine valve controller, that measures flow through the Heater Matrix. Come back with more, as necessary.
Regards,DT
SOURCE: Climate Control Outside temperature display incorrect
you need to replace the ambient temperature sensor or do the math
Testimonial: "Would be nice to know where the location of the ambient temperature sensor. "
SOURCE: air conditioning / heating system fan works on
Fan resister circute/switch needs to be replaced. Not expensive. Buy from dealer.
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