It always helps to mention the make, model and engine you have in your rig. Many water pumps have a weep hole that will expel a little coolant, but if the bearings and seals have too much wear it might be time for a new pump. If it's tough to access, consider other things you might replace while your in there such as belts, idler pulleys and tension pulleys, else you get to revisit it again a few times. Look up your engine and get the right torque figures for your pump. Some pumps need the bolts torqued in a particular sequence.Make sure it's not leaking from the thermostat housing and dripping down. Another but probably unlikely culprit are freeze plugs in the block that pop out or corrode through. You can buy a dye that shows up under ultraviolet light and your leak will show up dramatically. Once you find the leak, then drain all the coolant and have at it and you should be good to go for a good long time. How many miles are on your rig?
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