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Posted on Aug 10, 2010
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I have a 2000 Pontiac Sunfire. The rad cooling fan has been tested and is good. It doesn't come on at all when the car gets hot. Do you have a solution for this issue?

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Check the rad cooling fan switch and relay

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Anonymous

  • 74 Answers
  • Posted on Aug 26, 2008

SOURCE: 2004 pontiac aztek cooling fans not working

relays control fans high and low. does fan come on with a/c on?hot wiring only will create more expensive problems in future!!!!! 2004 not 84

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Anonymous

  • 2920 Answers
  • Posted on Nov 21, 2008

SOURCE: my 1998 pontiac sunfire is getting hot but not overheating

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

Larry Chandler

  • 1149 Answers
  • Posted on Nov 24, 2009

SOURCE: Were is the thermostat located in a Pontiac Sunfire 2000?

Hi:
Your thermostat is located under the thermostat housing, which is what the upper radiator hose clamps to on the top of your engine. Basically, you need to start with a cold engine, drain your radiator, then unclamp the upper radiator hose from the engine. Remove the bolts from the thermostat housing, and gently tap on it to remove it. clean up the mounting surfaces on both the engine and the housing, and install a new thermostat, and new gasket. tighten to proper torque, reconnect the radiator hose, then refill up the radiator and cooling system.

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My Cooling Fans not coming on my 2001 Pontiac Sunfire?
You tried to fix it yourself ? Do yourself a favor an take it to a qualified repair shop. Your just a parts changer ,have no clue how to test electrical circuit an don't know what make's the relay energize to turn on the cooling fan .

http://www.bbbind.com/tsb-wiring-diagrams-database-results/?type=WD&years=2001&make=50&makeDesc=Pontiac&model=555&modelDesc=Sunfire&system=5&systemDesc=Engine&subsystem=87&subsystemDesc=Cooling%20Fans&docid=7820359

https://www.youtube.com/watch?v=WcWc_KN6mrg
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My boyfriend has a 99 Pontiac sunfire, as far as we can tell there is no crack in the rad or the hoses, we did a compression test and everything is normal.. But the rad keeps bubbling all the water out of...
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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 ?
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May 06, 2017 • 1998 Pontiac Sunfire
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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
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Oct 04, 2009 • 1999 Pontiac Sunfire
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Yes, it's probably the PCM. I had the same problem, and upon replacing the PCM it started working again. If your cooling sending unit is new, and so many parts of your fan assembly are new, it's probably not receiving the signal from the sending unit. Hope this helps.
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Jul 22, 2009 • 1997 Pontiac Sunfire
1helpful
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My 1998 pontiac sunfire is getting hot but not overheating
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
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Nov 14, 2008 • 1998 Pontiac Sunfire
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1996 pontiac sunfire 2.2L car had been running hotter than normal, replaced thermostat and water pump, now the thermostat doesn't seem to be opening but not for sure that is the problem how do I...
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Jul 27, 2008 • 1998 Pontiac Sunfire
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