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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 29427
Experience:  GM Grand Master Technician 2007. 14 years experience.
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1999 pontiac sunfire: overheating..changed thermostat..fan on radiator

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1999 pontiac sunfire overheating--have changed thermostat twice--fan on radiator is running--no heat from heater--HELP!!
WelcomeCustomer Does the system push fluid out of the pressure cap when you drive it or idle? How long does it take to overheat?
Customer: replied 7 years ago.
after idling for about 5 minutes, the temp indicator increases to almost max(260)--no fluid is pushed out of collant tank

2.2L engine?

Customer: replied 7 years ago.
sorry for delay---Yes it is a 2.2L
OK, I suspect you have a bad head gasket. Take the pressure cap off when it is cold, and with the engine running, top up the fluid. Then watch and see if there is any bubbles in the coolant.
Customer: replied 7 years ago.
i think you are right and i accept that answer--would that also explain no heat inside the car?
Yes, the low coolant and the pressure will stop the flow. To accept, click the green ACCEPT. Thank you. If this helps, these are a very simply head gasket to replace.
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