Overheating / New Radiator

[Adam2201]

Thanks for the suggestions everyone. On mobile now, hopefully this is readable!

Just to give an update. I put the battery back this morning. Checked coolant levels and still full In rad (cap looks OK visually ) and correct level in reservoir.

Fired up first time and ran it up to temperature. Not a single drop of coolant coming out, no red light today. I don't know how hot it got idling but headers were red hot.

Fan didn't come on but it never does. I tested it last year and it does work (didn't test switch).

The only sign on the garage floor was a brown mixture (like oil and water) under thermostat. But could equally be rain that dripped off a rusty exhaust. The headers are white but looks more like salt. And as the coolant is full I don't think its that (no sign of crust on rad).

Will drop and flush the coolant as a matter of course as it's been two years (used premix last time). Then will try thermostat (just boil it in a pan and check it opens, closes when cool ?). Then presumably water pump like you say - that was my first suspicion Friday. How can I tell if its buggered? I guess the leak under it would be telltale If it's there when I get back home. You can't hear it working normally can you?