With regards to the heater...the XJ6 have a motor the moves hot water in to the car...driver side engine compartment. Occasionally it get stuck. Use a plastic hammer or anything heavy and tape on the motor lightly while the engine runs and with the heater on. Also the to make sure the relay is good. For AC make sure its charged. if you live in a cold area....the Freon leaks after each winter and needs to be recharged
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: I have a 2003 X-type
There's a temperture valve (usually under the hood). It diverts hot water from the cooling system and directs it to your heater. Follow the hoses. There will be two that go from under the hood and into the fire wall. (Usually on the passenger side. Follow the two hoses from the fire wall to the radiator. Somewhere along the way you'll see the heater valve. Replace it. Good luck.
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