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The most common cause is the intake manifold gasket. You need to look at the front corners of the intake were it meets the heads and see if there is coolant leaking at those points if so then replace the intake gaskets. You also need to check the heater hose fitting that screews into the left top front of the intake for a leak. It will have a black rubber hose hooked to it. It is common for them to leak too. The water pump may also be your problem, check it too. If it's leaking then coolant will be running down the lower radiator hose.

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Q: What causes a coolant leak on 98 Chevy silverado at front prt of the engine?
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