Question about 1998 Pontiac Sunfire

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My 1998 pontiac sunfire has a problem overheating

I checkd the coolant and its full i just cant figure out how to fix it. I think its the thermastat but i dont know how to take it apart to fix it

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  • Pontiac Master
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Posted on Apr 16, 2009

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I have 98 sunfire 2.4 over heating fan is workin the housing was replaced was told there is no thermastat for this model car it overheats on both sides the resoivor and the other side does it need a...


Hello and welcome to FixYa! If you have overheating problem, it can lead to multipleissues. You may be running on low coolant that's why the vehicle overheats. Ifthat's the case, please add coolant and make sure that it sits on the rightlevel, too much coolant can cause overheating too for coolant will overflow. The vehicle may have a faulty or worn out radiator blowermotor that's why it overheats. If that's the case then you will need a blowermotor replacement to resolve the issue. If the radiator is clogged with dirt and rusts this issueoccurs too. The coolant doesn't flow normally on the cooling system if it'sclogged. If that's the case, I strongly suggest that you have the radiatorflushed to drain out dirt and rusts. If you think that the radiator served youenough then it's better to have it replaced. Please do check the radiator hoses, If you have worn outhoses it can cause coolant leakage which can result to overheating. A tiny holeis good enough for the vehicle to overheat. A faulty thermostat sensor can cause the issue too. If youhave worn out thermostat, the fan may not trigger that's why the fan won't workwhen under stressed conditions. A blown radiator blower fuse can cause thisissue too so I suggest that you check the radiator blower fuse and replace itwhen necessary. What causes the radiator blower fan fuse to blow? It's becauseof a failing radiator blower motor, If that's the case have the radiator blowerfan motor replaced. If the fluid in radiator doesn't circulate then it meansthat you have a blown head gasket or a faulty water pump. I suggest that you gofor the water pump replacement first specially if you think that it's near theend of it's service life. Usually, water pops out the radiator when engine isreved (a sign of faulty water pump and possible blown head gasket). Hope you find this information helpful enough and thank youfor using FixYa! Have a good one!

Feb 21, 2011 | 1998 Pontiac Sunfire

2 Answers

I have a 2000 sunfire 2.2 and it's showing its overheating but it's not I changed out the thermastat and that didn't fix it what else could it be


It could be your temp sensor not reading properly, i just did one on am impalla last week. same sitouation.

Oct 22, 2010 | 1998 Pontiac Sunfire

1 Answer

1998 Pontiac Sunfire Symptoms: -Overheating


What are you going by to say it's overheating , temp gauge ? Have you test to see what the actual temp. is > Hook - up a scan tool ,what's the PCM - engine computer seeing for engine temp. ? 223 degress the PCM should turn on the cooling fan . You could buy a Non-Contact Infrared Thermometer With Laser Targeting at harbor freight ! Radiator very hot ????? What is the right temp .
Non Contact Infrared Thermometer With Laser Targeting

Could be a bad temp gauge . Is the coolant surging inside the cooling system ? Does it have a radiator cap ? Have you replaced it ?

May 06, 2017 | 1998 Pontiac Sunfire

1 Answer

My 1998 Pontiac Sunfire was flashing the coolant light, and today the check engine light is on


It is probably the same problem, you need to check the coolant level in the reservoir if it is full, then you need to check the coolant in the radiator. Make sure that you don't open it while it's hot, It will get you. You can also bring your car to advance auto or autozone, or most any other parts store and they will tell you why your check engine light is on, for free.

Feb 18, 2010 | 1998 Pontiac Sunfire

1 Answer

2001 Pontiac Sunfire 2.2 L overheating / runs out of antifreeze


it could be one of three things: drive belt, water pump or thermastat when you take in for the flush have all of these checked out

Jan 20, 2009 | 2001 Pontiac Sunfire

6 Answers

Pontiac sunfire overheating


I have your fix, Disconnect your Heater Core hoses and flush out the Heater Core or replace it. The coolant has to pass through the Heater Core before it gets to the Thermostat. GM designed the cooling system this way to speed up in-cab heating.

Jan 03, 2009 | 1998 Pontiac Sunfire

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