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i have an 03 7.3 with 110,000miles. i am planning on flushing the cooling system. i have all the coolant, new rad. hoses, and new serpentine belt. my radiator is new, couple months ago also. my question is, what else should i replace? thermostat and housing? heater hoses? water pump? idler pulley and tensioner? i would like to not have any leaks or trouble with the system. dont hold back. i would rather replace parts out in my polebarn than on the side of the road with a wife and three kids with me!!! thanks fellas
 

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The idlers have been known to go, but usually you get a squeal for awhile first. Thermostat is cheap, or depending on where you live you can omit it entirely. The water pump is an absolute joy to get the clutch fan off of, so if it ain't broke don't fix it. Adding a filter is PM dollars well spent
 
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