Check radiator hoses for the following

Check the coolant level in the coolant reservoir. Make sure it is between the "F" mark and "L" mark.

If the coolant level in the coolant reservoir is at or below the "L" mark, add coolant to bring it between the "L" and "F" marks, then inspect the cooling system for leaks.

Remove the radiator cap.

Check if there are any excessive deposits of rust or scale around the radiator cap sub-assembly and radiator filler hole. Also, the coolant should be free of oil.

If excessively dirty, clean the coolant passage and replace the coolant.

Install the radiator cap.