I'M AWAKE.

LOOSE BELT:

X

Last w/e I re-sealed the harmonic balancer. Belt was properly tightened.


COOLANT TEMP SENSOR:

X

This little item was replaced a few months back.


Keep thinking. These are all good "possible" fixes for this problem. But unfortunately, not in this case.

I will reveal the answer later this evening, IF someone doesn't get it.