Hey Guys, My First Time Using This Forum And I need your help
i have a 98 cadillac deville 145,000 miles
ive replaced the thermostat, water pump, flushed my cooling system, replaced some gaskets and housing near the water pump where my coolant was leaking out. new air filter, spark plugs, and an oil change.
My Car is reading the codes p0507 and p0603
my car runs great other then one thing
it doesnt over heat while im driving but while im in traffic, at a stop light or just idling in the driveway it over heats. both fans are coming on.
i have tried everything i know to try and it still hasent fixed the problem. can someone please help me

 

At this age you have to be looking to the head gaskets.

 

its not the head gasket,
no white smoke coming out
no water in my oil.
the car runs great. and smooth
it isnt loud at all

 

my radiator is leaking fluid.
could this be the issue.
but i just dont get it. only over heats while idling.
driving it does what its supposed to do

 

Have you done a pressure test on the rad. If you are not maintaining pressure then the boiling point will be lower than it should be.