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Answered 2009-04-09 00:31:47

Most likely your heater core has a leak. Your heater core is leaking. It must be replace to correct this problem. Anytime you get an anti-freeze smell, this usually indicates a leak in the system, usually the heater core. Have you noticed if the floor is wet under the area where the heater is located? Look for wet carpet on the floor of the passenger side front. Most 3.8 liter GM engines from the early to late nineties develop an intake manifold leak at some point. This is characterized by an antifreeze odor, rough idling, poor mileage, a lack of heat, and antifreeze appearing in the oil. Simple enough to fix, just replace the intake manifold gasket. Might as well clean the throttle body and change that as well. Repair cost for that job plus a tune-up: $600-700, for just the manifold gasket, you'd most likely stay around $300-400.

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