Question about 1998 Pontiac Sunfire

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1998 Pontiac Sunfire Symptoms: -Overheating

1998 Pontiac Sunfire Symptoms: -Overheating -Radiator hose on top is VERY hot. Radiator hose on bottom is cool/barely warm. Solutions attempted/tested: -Tested radiator for blockage – no blockage -Put on new water pump – no change -Put on new thermostat (185) (tried 3) – no change -Checked to make sure thermostat is not backwards -Gutted out thermostat and car runs fine with no thermostat – hoses are -Checked for no collapsed hoses – all OK -Fan is running Whay does the car continue to overheat with the thermastat in?

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  • Pontiac Master
  • 11,766 Answers

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 ?

Posted on May 06, 2017

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Posted on Jan 02, 2017

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  • 14036 Answers

SOURCE: after spending 880 dollors on having a head gasket

YOU COULD HAVE A DEFECTIVE WATER PUMP OR THERMOSTAT ALSO RADIATOR PRESSURE CAP.MAKE SURE YOUR WATER PUMP IS BEING TURNED BY DRIVE BELT.NOT SLIPPING.MAKE SURE COOLANT SYSTEM HAS BEEN BLED AND YOU HAVE HALF ANTIFREEZE HALF WATER.CHECK YOUR CRANKCASE WHEN CAR COOLS DOWN.IF OIL STILL LOOK LIKE MILK SHAKE.YOUR NEW HEAD GASKETS LEAKING.THE MECHANIC WHO REPLACED HEAD GASKET DIDNT DECK THE HEADS.THEY PROBABLY NEED SHAVED A LITTLE SO HEAD GASKET WILL SEAL.

Posted on Nov 11, 2009

  • 121 Answers

SOURCE: I have a 2000 Pontiac Sunfire. It keeps

i'm not being smart, but do you know for sure you are installing the thermostat correctly? the thermostat is there to slow the water flow down long enough for the water to obsorb the heat .also is the cooling fans operating ?do the fans come on at around 210 degrees?is the radiator grill clean? lower spoiler intact? does the engine over heat at highway speeds or while idling? are there any codes?is the engine running lean? possible fuel filter stopped up.fuel injectors dirty. let me know

Posted on Dec 03, 2009

jturcotte
  • 8274 Answers

SOURCE: Car is overheating any opportunity it gets.

Hi, it sounds like you have air in the cooling system and there may be a head gasket leak. Recommend you park on an incline, remove the radiator cap, set the heater on high, start the car and let it warm up until there is flow in the radiator. Fill the radiator and keep it full while the engine continues to run. Look for any bleed ports the system may have either in the hoses or at the attach point housings. Crack any bleeders open to allow any air out. Top off the radiator all the way to the neck and make sure there are no bubbles coming up. Bubbles coming out the radiator are an indication of a blown head gasket. In your case, the problem may be intermittent, so pull the throttle open while watching to see if that produces any bubbles. If no bubbles, close the cap. Hopefully this will solve the problem.

Posted on Feb 18, 2011

afarri
  • 1386 Answers

SOURCE: i have 98 sunfire 2.4 over heating fan is workin

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!

Posted on Jun 10, 2011

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2 Answers

I have a 2003 pontiac sunfire that runs hot and then is fine for a couple weeks . have put it in the shop several time .Any ideas?


Difficult...

Running hot would come down to a blocked radiator, a collapsed hose, a faulty temperature sensor or a cylinder head/gasket problem.

it could also be the gauge or even a bad earth on a temperature sensor.

Does your car exhibit any signs of overheating .. steam .. boiling radiator ... rough running?

It's strange that it runs fine for a couple of weeks and then runs hot. To me that suggests a temperature sensor/thermostat problem coupled with the outside air temperature.

What did the workshop suggest?

Mar 21, 2016 | 2003 Pontiac Sunfire

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Runs hot sometimes. Top radiator hose hot, bottom cold. What's wrong?


top hose should be hot, all water from engine goes through upper hose, then radiator to cool and out lower hose.

Jan 29, 2016 | 1997 Pontiac Sunfire

1 Answer

Pontiac sunfire overheating


hello! I had the same problem with my 2000 Pontiac Sunfire... there might be one of these 2 problems with it.... maybe the Heater Core is jammed and the coolant dosen't flow thru the engine to cool it off, or the water pump is defective.... does the heating works or not? if yes, the water pump is defect, if not, the heater core is jammed, try a ''radiator hose cleaner'' (sold in Napa's or Carquest..) it will act as a kind of ''decloaker''.. if works, good! 15$ solution... if not, replace Heater Core... ~150$

Jan 09, 2012 | 2000 Pontiac Sunfire

1 Answer

1998 pontiac sunfire cooling system themostat location


Follow upper radiator hose from rad to thermostat housing on engine.

Nov 25, 2010 | 1998 Pontiac Sunfire

1 Answer

1996 sunfire overheating replaced thermostat, waterpump and heater core. Fan is working after cleaning relay. Still overheating ?


Does the top rubber engine to radiator hoes get hot? If yes then the new thermostat is working. Does the bottom return hose from the radiator back to the engine also get hot? If yes then the pump is OK. If not then there is a blockage in the system and this will need to be flushed out from both the radiator and the engine block using a high pressure hose. Does the radiator fan come on promptly. It should start before the bottom return hose becomes hot. If not then the temperature sensor (different from the temperature sender to the dash display) maybe at fault. Your relay maybe fine but it is the sensor that actually triggers the fan to come on. It may be just bad connection so try wiggling the wires to it when the engine has got warm. The temperature sensor is also important to let the engine computer management system (ECU)know that the engine has reached operating temperature. A failed sensor not only allows overheating but means that the ECU thinks the engine is still cold and runs the engine on a rich mix. Have you noticed lumpy idling when hot and excessive fuel consumption recently? these are symptomatic of a failing sensor.

Jul 13, 2010 | 1996 Pontiac Sunfire

1 Answer

02 sunfire overheating


make sure you have radiator full of coolant
run the car to operating temperature
check the operation of the cooling fan
feel the upper radiator hose and the lower radiator hose. they both should be hot.
if one is cold then you may have a bad thermostat or restricted flow
if cooling fan does not come on when engine is hot then you have bad cooling fan switch, relay or motor.
good luck

Mar 07, 2010 | 2002 Pontiac Sunfire

1 Answer

After spending 880 dollors on having a head gasket water pump and radiator replaced in my 1998 pontiac sunfire 2.2 liter it has no flow thru the brand new radiator engine runs supur hot 260 degrees in 2...


YOU COULD HAVE A DEFECTIVE WATER PUMP OR THERMOSTAT ALSO RADIATOR PRESSURE CAP.MAKE SURE YOUR WATER PUMP IS BEING TURNED BY DRIVE BELT.NOT SLIPPING.MAKE SURE COOLANT SYSTEM HAS BEEN BLED AND YOU HAVE HALF ANTIFREEZE HALF WATER.CHECK YOUR CRANKCASE WHEN CAR COOLS DOWN.IF OIL STILL LOOK LIKE MILK SHAKE.YOUR NEW HEAD GASKETS LEAKING.THE MECHANIC WHO REPLACED HEAD GASKET DIDNT DECK THE HEADS.THEY PROBABLY NEED SHAVED A LITTLE SO HEAD GASKET WILL SEAL.

Nov 11, 2009 | 1998 Pontiac Sunfire

1 Answer

Car overheating


Follow top radiator hose to engine and thats where the thermostat is located under the housing at the end of the top hose at the engine.

Apr 18, 2009 | 1998 Pontiac Sunfire

2 Answers

Need to know where the radiator drain plug is on a 1998 pontiac sunfire is. thanks


remove one end of the bottom hose,it doesnt have a drain plug ,they went out with the arc

Jan 01, 2009 | 1998 Pontiac Sunfire

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