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I need to know how to replace the top radiator hose?
If you have not done a job like this before you might want to consider watching a professional from YourMechanic do it for you, especially as the labor time is less than 1.5 hours so it's pretty economical. The first order of business, of course, is to make sure that the upper hose is actually leaking and you don't have a different issue such as a crack is the radiator itself where the hose attaches. Also, if that hose is leaking due to a break in aged rubber, the other "old" hoses should be inspected as well. A radiator hose replacement entails removing any plastic shields that prevent access to the hose(s). Then, you have to drain the coolant to a level below the lowest point that you will be working at. The hose clamps are removed and then you have to carefully "debond" the hose from the point it is attached to the tank. Over time, the rubber will bond really tightly to the radiator and you have to break the seal with damaging or severely scratching the radiator "nipple" (the part the hose slides over). Then you slip the new hose on (with clamps already loosely applied), apply the clamps and you are ready to refill. When refilling, you have to open the cooling system bleeder screws (if equipped) to ensure that air does not get trapped. Trapped air could cause the car to overheat as trapped air can block coolant flow.
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