The 3800 is not the engine prone to lower intake gasket leaks, the 3100 and
3400 are the victims here. There have been issues with the egr passage in
the 3800 composite intake cracking or degrading, causing coolant to enter
the engine, obviously if you are loosing coolant to the point the heater is
not working, you better address this as soon as possible. This applies to
the later 3800 engine with the composite intake.
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