On a thermostatic clutch That's a bad sign.
On a viscous clutch it could go either way, which is why I never run one anymore.
Did you test it with an IR gun, or a meat thermometer?
Working in your driveway, with the cap off,you can get her hot, then cool it by watering the outside of the rad. The temp should begin dropping almost instantly.
If you see bubbles in the water, or foam, or smell exhaust, well you know what that is!
Sometimes , when you blip the throttle, you can hear it bubbling in the heater core. Reverse the hose connections and try again.
At idle in your driveway, with the engine hot, the fan should be noisy and moving huge amounts of air. If you have A/C, the condenser is, or can be, a huge PITA. They get clogged with dirt and debris and insect nests/eggs.
