I drained the system and flushed twice. Then filled through the expansion bottle.
50/50 distilled water and zerex G05.
I did not fill the head before starting. A true senior moment!

Now: Everything goes well at first. Temp guage sitting at just below 9oclock.
Then after a long hot run, on a hot day with a/c on, temp guage rises just above 9oclock, and eventually about half way between 9oclock and red.
Once I turn the ac off, it takes a while but the guage will return to just above 9oclock.
Compensation board has been bypassed.

I havent noticed any steam from the tail pipe, or any goo under the oil filler cap.

Any suggestions.

Thanx

LS.

For the most