340 coolant temperature

Should get rid of the flex hose on the top and definately the one on the bottom and get factory style hoses.

What temp Thermostat do you have?

Please direct me to the factory style hoses.

I am not sure what the Thermostat is but I have a 180 waiting to be fitted when I find out the overheating issue.

I am planning to flush the system and change Thermostat (and any other items on the cooling system).