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Sounds like the engine has either a head gasket leak or an intake manifold gasket leak. At any rate, anti-freeze is getting into your engine oil. Major repairs are needed, most likely.
Sometimes, not the heater coil...this leak usually smells inside the cabin...can you see anti-freeze build up anywhere? These motors are more prone to a water pump leak (needs replaced, inexpensive and not to difficult) or the intake manifold gasket...more costly about $400. for a mechanic to do...you should see some anti-freeze build up around the intake bolts...this assumes that there is no water in your oil...which is far more costly as this indicates an internal cylinder head leak...Could be just a hose leak...a bad radiator cap...or thermostat housing leak, (maybe a cracked housing? Help me help you...do you see any anti-freeze build up anywhere? Hope this helps.
The plastic intake upper plenum is known to warp,causing this leak.I believe too much heat from the nearby EGR port.the solution is more than just a new gasket, an upper intake is usually required.there are aftermarket suppliers,which could save you some money on parts.be sure to check around...good luck
It is possible that it may be the intake manifold leaking. If it is a 3.8 or 3.1 liter V-6 I would check the intake manifold gasket. These have a plastic gasket with silicone on each end that tend to crack and start leaking. you can normally see the leak behind the exhaust crossover pipe on the back side of the engine.
Rear crossover ports on the intake manifold, and/or freeze plugs at the rear of the engine. Also see if there is a hot water control valve for the heater in that area.
leaking anti freeze and sputterwhen being still
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