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I've seen a lot of water pumps leak on these trucks. Toyota's Long Life Coolant will crust over and harden when it leaks slowly, therefore you won't see any drips in your driveway. Check for crusted coolant between the water pump and the engine block by the thermostat housing. That is where they usually leak although I have seen water pumps leaking that aren't apparent until the timing cover is removed.

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18y ago
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Q: Your 1999 Tacoma V-6 uses coolant but does not over heat run hot or leak Please advise?
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