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Coolant leaks on the 3.4L engines are usually related to the intake leaking or the head gaskets leaking. It's very possible the head gasket is leaking and is pressurizing the cooling system and damaging it leading to the water pump problems but usually the rad & heater core get damaged first. To check for a head gasket leak do a visual check for external leakage or bubbling in the rad or overflow bottle and/or take it to a shop that has a gas analyser or emmision testing machine and see if hydrocarbons are present in the rad or overflow. If hydrocarbons are detected in the cooling system the headgasket is required. Also check for white scum in the oil cap but this is not always a true sign of leakage.

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Q: 2000 venture has a coolant leak plus you have replaced the water pump twice in the past year. Help?
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