Having problems with your 2005 Pontiac Sunfire ?

Cooling fan is on all the time - 2005 Pontiac Sunfire

Posted / edited by AnonymousUser on : 19-03-2018

Answers :

There are only a couple reasons for the cooling fan running constantly. Either the temperature sensor is faulty or the car is running to hot.
In most cases it's the car running to hot. There are several possible causes for this.

  • Corrosion build up in the radiator and engine water jacket.
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  • Incorrect radiator fluid/water ratio.
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  • A faulty thermostat.
The first thing that should be done is to drain the radiator and refill it with water and a radiator flush.
A good indication of corrosion in the system will be a brown color to the fluid that was first drained.
Once you have allowed enough time for the flush to do it's job. Drain it and refill with water. Run the engine for 10 more minutes and then drain it again. Now refill it using the correct radiator fluid and water ratio.
If the problem persists the next thing to do is replace the thermostat.
This is relatively simple to do and can be completed in under an hour with basic tools.
The thermostat is located on the engine where the large radiator house is attached. Undo the hose clamp and any bolts holding the thermostat housing on. Once you pull that off you will see the thermostat. Replace it, making sure to install the new one the same way the old one comes off. Now reinstall the housing and house.
If this doesn't take care of the issue you may need to seek a mechanic for help.
I hope this helps.
Do you have your heater contro set to a/c
Repair Help & Product Troubleshooting for 2005 Pontiac Sunfire

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