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Process of elimination. These are things that have caused 986 overheating in the past. Check off the list and see what you find:
* Totally clogged airflow between the rads and A/C condensers.
* Air bubble in the coolant causing intermittent overheating.
* T-stat stuck closed.
* Water pump impeller chunks in the head coolant passages.
* Reversed send/return coolant lines after changing the WP.
* WP impeller chunks blocking radiator passages.
* Failed rad fans
Good luck!
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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