stuck thermostat?

TrailBeast said

I would suspect the water pump impeller next.
Pull the top hose at the radiator while your thermostat is out and fire it up.
That’ll tell ya real quick.

I drill every thermostat if it doesn’t have a vent hole.
You don’t have to screw around with air bubbles when filling.

Click to expand...

Not much of a test, but with the upper hose off and the belt off I can hear the impeller sloshing around as I move the water pump pulley


This is with the belt back on , sure seems to be flow in the coolant



For now I put it back without a thermostat
I should have time for a good shakedown tomorrow, see what it does