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Your truck is losing coolant for one or more reasons including; a leak outside the engine, typically the water pump, or heater hose (should be noticable in the engine bay or on the ground), or leaking due to a failed head or head gasket (should be noticable by coolant in your engine oil- eg. white/milky oil, or noticable by thick white smoke/steam at the tail pipe especially for a short time after engine start-up.

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Q: Why is my GMC truck is using a lot of coolant?
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