99 Pontiac Sunfire 2.2 Overheading Problem

Asked by Brougham Aug 12, 2018 at 03:49 PM about the 1999 Pontiac Sunfire 4 Dr SE Sedan

Question type: Maintenance & Repair

Okay so I have a Pontiac Sunfire with the 2.2L that
keeps over heating weather I'm driving it on the
hwy or in city traffic. But I have replaced the
radiator, coolant reservoir and cap, upper and lower
radiator hoses, thermostat and thermostat
housing, water pump, and heater core and heater
core hoses. So when was replacing all that this
stuff I noticed that the coolant was a burnt orange-
light gray type of color and that all of the hoses
had a lot of corrosion bill up in them too, and the
old coolant reservoir had a dark brown almost
black billed up on the bottom of it too. And after all
of this 5 full coolant flushes useing straight water
to get all of the old coolant out of the engine, and
thin 5 more flushes with the right coolant for the
car it is still over heating and I just don't know what
to do to fix this anymore, cause this car is not like
anyother car. So can anyone point me to what the
real cause is or what I have over looked that would
be very appreciated

64,500

firebird338 answered 5 years ago

Try bleeding air from system like this. Remove cap from overflow tank fill with antifreeze to full mark leave cap off and start vehicle and let idle you will notice level in tank start to rise this is normal once thermostat starts to open level in tank will drop add more antifreeze to full mark then put cap back on.

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