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because something in the coolant system has failed or is damaged, IE: hoses, radiator, water pump, head gasket. This is probably causing an overheating condition. If not, it will soon.
Check to see if there is water in the engine oil. If so, it will look milky and indicates a failed head gasket. This is serious and needs to be addressed before you drive the car any further.
What else can I help you with?
How do you fix horn in 1998 Pontiac Sunfire?
how to check fuse for horn in a 1998 Pontiac sunfire
Where is the EGR valve on a 1998 Pontiac Sunfire 2.2L engine?
its right next to the valve cover on the driver side behind the coolant sensor
Why does the Coolant light on 1998 Sunfire 2.4 stay on?
Low coolant?Bad sensor?
Where is the horn relay on a 1997 Pontiac Sunfire?
See stvndberryhill's answer under 1998 Pontiac Sunfire horn relays. This answer applies to all year models of Pontiac Sunfires.
Where is the thermostat on a 1998 Pontiac Sunfire?
Off the water pump
What kind of freon is used for a 1998 Pontiac Sunfire?
R134a
Where is the thermostat located on a 1998 Pontiac Sunfire?
check this site------>
Pontiac grand am gt 1998 coolant temp sensor?
I have a 1998 Pontiac Grand AM GT that coolant sensor went bad. So how do you change it with out breaking the coolant
Why would the coolant light stay on in your 1998 sunfire if the car is full of coolant?
Bad sensor? == ==
What is the windshield wiper size for a 1998 Pontiac Sunfire?
22 and 17
Will a 1999 Malibu transmission fit a 1998 Pontiac sunfire?
Yes
What is the gas tank capacity of a 1998 Pontiac Sunfire?
the 98 sunfire haz a 57.2 litre gas tank
