Sounds like its the blend door actuator has failed or loose or cracked vacuum line going to it. These are usually not fun to replace although I dont know about your specific model, but most that I have seen you have to remove the dash.
I have a 2006 jaguar s type 89ml started with the car foging up then this year car only blows hot air
I've has the problem twice on a 2001 3 litre...first time needed new heater blend valve, second time cause was fallen coolant level.
REPLACE HEATER CONTROL VALVE ,VALVES ARE PROBBLEY STUCK
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Same goes for my 2000 Jag S-type w 3.0 Liter. If I shut of the A/C button, the windshield fogs completely up very quickly.
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