Question about 2000 Pontiac Sunfire

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Sunfire overheats,fan does not chip in,what is the problem

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  • Brenda May 15, 2014

    Start by changing your overflow cap. It is pressurized and over time wil begin to lose pressure and the fluids will not flow properly causig it to overheat

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  • Pontiac Master
  • 2,122 Answers

Hi Nigel, Could be a defective temperature sender unit or fan relay or a defective or fouled fan. Regards John

Posted on Jul 20, 2013

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I have a 98 sunfire. should the cooling fan on the radiator come on from the initial start up?


The engine cooling fan is designed to come on when the engine reaches 225-235 degrees Fahrenheit. That is the only time it runs. Do you get a check engine light?

Apr 30, 2012 | 1998 Pontiac Sunfire

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I have 2001 pontiac sunfire keeps overheating. I replaced thermostat and antifreeze still overheats?


did you check the radiator fan? if fan doesn't works. Check the radiator fan relay.

Aug 16, 2010 | 2001 Pontiac Sunfire

1 Answer

2001 Pontiac Sunfire is dumping antifreeze out the overflow. Could it be something other than thermostat?


Common causes include: leak from engine, hoses, etc. causing overheat due to low coolant, electric fan not coming on, internally obstructed radiator, external obstruction to radiator (leaves paper. plastic bag on front of radiator of stuck between radiator and A/C condenser), bad thermostat and last, blown head gasket. Proper testing for any and all these conditions will give you the answer you are looking for. If the antifreeze is overflowing without any overheat, it can either be over-full, or in some cases, a head gasket can do this by filling the cooling system with exhaust and driving the coolant out.

Aug 15, 2009 | 2001 Pontiac Sunfire

2 Answers

Overheating problem


check if there is any antifreeze in the radiator if ther is not u have a leak internal or external? how long does it take to overheat Ex. 10 miles, 20miles, or immediatly?

Jul 23, 2009 | 2001 Pontiac Sunfire

2 Answers

2001 Pontiac Sunfire overheats and more


problem #2 sounds like you need a blower motor resistor.

Jun 26, 2009 | 1997 Pontiac Sunfire

1 Answer

Bent fan


if fan is damaged replace,make sure coolant level is ok and thermostat is working properly.

Apr 01, 2009 | 1995 Pontiac Sunfire

2 Answers

Fan runs after car shut off


You may need to replace your thermostat. This is normal for the fan to run after you turn your car off but if you say its running for 20 minutes or longer, it may mean your thermostat is stuck and causing the fan to run longer to cool off the radiator. Its a good thing for the fan to run. Heat is your enemy. I rather the fan run than no fan at all, if your car overheats, you could blow a gasket or warp your valves and its really pricey if that happens

Nov 25, 2008 | 2002 Pontiac Sunfire

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