What is the normal coolant temperature 1997 cadillac deville?
The system can go to 245 or 250 degrees with no problems on a
high demand, heavy load situation. It's designed to work that way.
With a 15psi pressure cap and 50/50 coolant mixture in the system
the system will not boil until 265 degrees. The Northstar engine
has a "loss of coolant' limp home mode that will activate
automatically long before you get any thing hot enough to damage a
head gasket or anything. The loss of coolant limp home mode is so
effective that it's been proven time and time again to run the
engine for 50 miles at 50 MPH without any coolant in the system
without any engine damage. So you (and your engine) are protected
even in your worst nightmares of an overheat or something. It will
allow you to drive to a safe place even with all the warnings and
chimes going off without any risk of damage.
Forget what used to be normal for coolant temps on older cars.
The systems are more efficient at cooling running at the higher
temps, the engines are happier and are cleaner (for emissions and
internally), get better fuel economy and last longer running at the
higher temperatures. The cooling fans are only activated at 225
degrees or above so anything below that is considered ice cold by
the engineers that designed the system. There is no need to slow
down, pull over and idle or do anything out of the ordinary
regarding the cooling sytem. Drive it and quit worrying.
Service the cooling system every 5 years or 100K by draining and
refilling with fresh 50/50 DexCool/distilled water to keep the
corrosion inhibitors in the coolant fresh to prevent any internal
corrosion. That's what causes blown head gaskets. Lack of cooling
system maintenance over the long haul.