Question about 1999 Chrysler 300M
You most likely have a bad head gasket. When the gasket goes bad you can have antifreeze mix with the oil or pressure from the cylinder can enter the oil or cooling system.
In your case the gasket has failed between the cylinder and the water jacket. This is allowing the pressure from the cylinder to enter the cooling system and the pressure is exiting via your overflow jug. If you remove your spark plugs you will most likely find one or more that are wet with antifreeze.
Posted on Oct 18, 2013
Can be caused by many things.
does it leak (overheat) all the time.
does it do it at first start, parked, idling, for 5mi, or 30min.?
or only after engine warmup ,then i drive and only at stop signs
does it overheat moving fast , steady 45mph speed?
there are many tests, all are easy.
first off , it can be bad RAD,thermostat, lost coolant (ignored service) bad water pump, bad RAD CAP.(replace if bad)
or cracked engine bock, cracked head, bad head to block gasket.
to name a few.
if it only fails at stops signs look for RAD tube blockage
i use an IR pyro gun to find these.
there are 3 more tests, ask.
Posted on Oct 16, 2013
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Posted on Jan 02, 2017
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