Dear Red;
I would make sure the light is working correctly first. Put a thermometer in the radiator and find out what temp the light turns on at.
Your local parts store will test your cap free..
If all that stuff is okay check the radiator for free flow. This is done by removing both hoses and pluging the top one with a rag and filling the radiator with water to see if it comes out the bottom as fast as it goes in etc. If it does, that's okay.
Good luck, John M......
