Last year my car suddenly overheated while idling to the point the coolant tank exploded. I took it to a foreign car repair shop where they replaced the coolant tank and put in another thermostat. It didn't make it home before it overheated again. I took it to the Jag dealership where they felt that my hoses had expanded to much during the overheat so they replaced all of my hoses to a tune of $1000. Three months later it overheated again. I took it to another foreign car repair shop where they discovered the real culprit. An impeller had broken off of my waterpump, I had a blockage in my radiator, and I had a short in one of the coolant fans that made it only work part of the time. So about $2400 later my car has been coolant issue free for about 2 years now. Good luck and I hope this helps.
Check the fan connection plugs. mine came adrift and caused intermitant operation.
Try changing the radiator cap
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