Why does the ac lite come on when i call for defrost,and i don't have heat on 1997 Jaguar XJ6

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i changed the heat control valve. i got heat for 20 min. then i got cold air and no heat. When i try to use the defrost, the ac comes on
(2) Answers
(2) Comments
What was the first '1'???............was I just insulted????????????........:).never mind.
Most cars default to A/C 'on' with defrost , to dehumidify the air,that is normal. Possibly a problem with the temp controls or air mix door(s) in heater A/C case. Is the coolant level OK? Is the engine warming up properly?
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