Question about 2003 Jaguar S-Type
Taking a shot at this, I'd replace the thermostat. If it is partially open at idle it would allow enough coolant to pass through, but at higher revs, that slight allowance may not be enough to keep the engine cool.
It's inexpensive and easy enough to replace.
I hope this helps... Good luck!
Posted on Aug 28, 2009
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Posted on Jan 02, 2017
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