Forum Discussion
westend
Nov 26, 2016Explorer
Some vehicles will have a "T" in the upper heater hose to eliminate air. Some vehicles have an expansion reservoir that is plumbed into either the radiator cap or a fitting on top of the radiator. That plumbing to the reservoir acts as an air eliminator. Any opening on the top of the radiator will eliminate air in the cooling system. IOW, leave the cap loose.
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