Question about 1998 Pontiac Sunfire

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My 1998 pontiac sunfire is getting hot but not overheating

The fan will not turn on when the engine gets hots. how do i check the fan. i changed the relay switch for the cooling fan.

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  • Anonymous Mar 26, 2014

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The fan may be bad but you can find the hot side of the plug and run a hot to the battery and see if the fan comes on. if it doesent you know you have a bad fan if it does you can run a wire to the fuse panel so that it comes on when the car does and shuts off when you shut the car off

Posted on Nov 21, 2008

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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

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

Where is coolinf fan switch located on 2004 pontiac sunfire


It's inside the computer.

Turn the AC on. If the fan still does not turn on then you may have a fan relay or computer issue.

Also if the engine does not get hot enough the fan will not turn on. You may have a defective temp sensor or thermostat

May 26, 2010 | 2004 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

I have a 1998 pontiac grand am se, and i have had to replace my radiator several times in 2 days and each time i replace it it leaks in the same place. I am wondering what could be causing this problem...


is your engine running hot? did they replace it with new radiator or just patch it up. I only reason why your car do what it does is that the radiator is building up too much pressure and not circulating through the engine. replace the thermostats and the switch along making sure you colling fans is working. does the fan run at all when the engine is hot? turn your ac button off so that way the ac fan is not running. see if you cooling fans kicks on when idling long period, watch your temperature, don't let it get hot, if it does turn it off and have the fan check and the water pump; change thermostat and the switch if you haven't had it done.

Sep 24, 2009 | 1998 Pontiac Grand Am

2 Answers

Sunfire overheating, not low on coolant


Sensor on the engine sends info to the computer that triggers fan relay and sends power to fan. Most often problem is sensor or relay but quick check fan itself by hot wiring it to the battery Polarity is not an issue...if you get wrong it will run backwards. If it does not run, it's bad.

Jul 30, 2009 | 2001 Pontiac Sunfire

1 Answer

97 Pontiac Sunfire overheating


check the engine coolant temp sensor, if the sensor is failing it will read always cold and not turn the fan on, if everything else looks and tested ok try the ECTS (engine coolant temp sensor)

Jun 20, 2009 | 1997 Pontiac Sunfire

2 Answers

Overheating


check the engine coolant temp sensor.... this controls the computer to turn on the fan

Oct 10, 2008 | 1996 Pontiac Sunfire

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