If you have an infared temperture tester you could easily check to see what that is. I use one for many things like checking tire temps, air conditioner temps water heater, meat on the grill. THey are worth the cost of them today. What temperature on the dash does it say the water temperature is? That should be close to the ambient temp of the radiator near the altenator. Good luck and keep us posted as to the outcome.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7