I agree with Tom's input. If you do not know by the previous owners documentation when the coolant was last changed. A good investment to have the system flushed, and a complete change over to Final Charge (or similar, we use Final Charge as we can usually always find it in larger truck stops stores). Have the thermostat, and radiator cap changed at the same time. The shop should change your coolant filter over to a dummy filter, one without SCA involved, at this service. And, if the radiator shows any signs of crud, a good cleaning will keep everything cooling easier.
To keep things simple, we also had our generator coolant changed to Final Charge. And only carry one gallon of the 50/50 mix to use if needed for topping off of both engine and generator coolant.
Enjoy the ride. Oh, and yes, that coolant tank should have coolant in it. Many coaches have several gallons of coolant in a tank, and when low, will send a warning to the engines ECM. I know of some whose ECM's have gone into protection/limp mode, due to low coolant levels. (May not apply to your coach.)
Best,
Smitty
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07 Country Coach Magna Rembrandt 45' ISX600
Roo II was our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
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