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the intake gaskets are prone to leaking. Get a hanes book and good luck Actualy, the intake manifold has 2 different versions. The first version is prone to leaks. The second is much better. Also the replacement throttle-body gaskets(GM# 12580919, $40.00) fit BOTH versions and have been redesigned to help with this. The coolant passageway is located at the very bottom of the throttle-body. Your engine sometimes idles rough because it is also leaking into the intake manifold. I won't go into details here, but it should take you only an hour the first time using common hand tools. I'll warn you that the throttle-body is fragile and you do not need to remove any sensors(doing so will sometimes strip the threads or break the screws off!).

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Q: Your 99 Monte Carlo is leaking coolant under the throttle body Can you tell you what parts are located under the thottle body that can be leaking coolant?
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