Thank you Lee and jerry,
That is very good news. On advice I replaced the original rad cap with a 7 lb cap. The original was 16 lbs , I will check that is correct, and replace with the correct cap for the C12. I replaced the Ford plastic coolant overflow tank over a year ago with the Beaver solid steel version. I also added a CAT 1 gallon overflow bottle. I use CAT ELC coolant.
I am going to flush and refill the Cat ELC ,change the filter and if possible, replace the hoses.