Quote Originally Posted by AK Bob View Post
It doesn't sound good, maybe worth doing a combustion test to confirm.

https://www.amazon.com/Block-Tester-...6VVBSFTF&psc=1
I have the tester on there, and it got up to temp and cycled the thermostat.

The test fluid didn't change color, but the liquid bubbled in the tester.

Just sitting here idling, the upper rad hose got super hard, and the reservoir overflowed.