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THE TEMPERTURE WARNING LIGHT ON MY 1987 XJR SUPERCGARGED IS COMING ON ALSO THE AIR CON IS ONLY BLOWING COLD AIR ,,,IS THIS TERMOSTAT RELATED ?THERE SEEMS TO BE A GURGLING FROM THE EXPANSION TANK BUT NO APPARANT LEAT ,,,TEH TEMP GAUGE IS STILL IN THE MIDDLE ,,,BUT THE LACK OF HEAT FROM AIR CON WORRING CAN ANY ONE HELP,, CAR HAS 92 000 MILES AND IS WELL CARED FOR  

It's interesting that your temp warning light is on but the temperature gauge is reading that all is fine. Does it seem as if the car is running hot? You need to check with someone who knows Jaguars on what the temp warning light may indicate. That is the first step.