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Old 08-30-2017, 11:48 AM   #1
rkert99
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Default Radiator Fan Not working

Was driving along yesterday when the battery warning light came on followed by the temperature warning light. I pulled over, popped the hood and the coolant was boiling etc. After I let the car cool I started it and the radiator fan which previously cycled on and off even at idle wasn't working. I checked the fuses and swapped relays so that's not the problem. What are the next most likely causes/weak points in that system? Coolant temperature sensor? Hoping it's something simple like that and not the ECU etc.

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Old 08-30-2017, 03:54 PM   #2
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Default Re: Radiator Fan Not working

Is the serpentine drive belt missing?

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Old 09-04-2017, 01:39 AM   #3
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Default Re: Radiator Fan Not working

Missing as in skipping or not turning properly or missing as in gone? It's an electrically driven fan. It was working not long before and then just stopped and the car started to overheat.

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Old 09-04-2017, 02:07 AM   #4
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Default Re: Radiator Fan Not working

The reason for asking about the serpentine belt is because of the battery warning light having illuminated. This light typically appears because of the loss of power from the alternator. Is the belt present?

If the belt is there and appears to be maintained with adequate tension then check the charging system voltage. Battery voltage varies from 12.3 to 12.6 volts. Charging system voltage varies from 13.4 to 14.5 volts.

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Gov't's grown bigger, but a chance exists that it will be reduced. I'm cautiously hopeful.

Last edited by pierrot; 09-04-2017 at 02:17 AM..

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Old 09-04-2017, 04:49 AM   #5
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Default Re: Radiator Fan Not working

If the drive belt deteriorates, something enters the engine area and tears the drive belt apart, the drive belt no longer turns the water pump, ac compressor and alternator. The water pump and alternator need to be driven at all times while the engine runs otherwise the cooling system will overheat and the battery light turns on. Open the hood and check for one serpentine drive belt. It's either there or not.

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Old 09-04-2017, 11:06 AM   #6
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Default Re: Radiator Fan Not working

^Yup, I didn't look through the Astra cooling system configuration. The serpentine belt does indeed drive the components mentioned above by fdryer. If the belt is missing, or proper tension can no longer be maintained on it, this could also explain why both the battery and temperature warning lights illuminated at nearly the same time.

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Old 09-04-2017, 02:26 PM   #7
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Default Re: Radiator Fan Not working

OK, I'll check when I get a chance. I'm pretty sure the AC was running and working when the car overheated though.

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Old 09-04-2017, 08:23 PM   #8
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Default Re: Radiator Fan Not working

Good call guys. the serpentine built is broken. So hopefully that's all that needs fixing. It's weird though that the car only threw codes for the radiator fan and nothing else.

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Old 09-05-2017, 12:10 PM   #9
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Default Re: Radiator Fan Not working

Most serpentine belts can last for 60K to more than 70K miles before they fail. Before installing the belt, inspect the pulleys to make sure there is no roughness present which could tear the belt over time. After the belt has been replaced check it with the engine on and make sure that the belt has no slack in it. If there is any slack you will see the belt "bouncing." (There are videos of this. Look up a belt online for your car through RockAuto.com. Choose a Gates brand belt, click on the INFO page link and there should be a video on it which can be viewed directly off of that page.) If this happens then the tensioner requires replacing.

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Originally Posted by rkert99 View Post
......It's weird though that the car only threw codes for the radiator fan and nothing else.
Not necessarily. Those codes, whatever they were, were the only ones needing to be addressed. The system is functioning normally in my view.

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The blessings of liberty erode in my country.
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Old 09-10-2017, 10:32 PM   #10
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Default Re: Radiator Fan Not working

Cool. Replaced the belt and everything seems to be working properly now. Thanks

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Old 09-11-2017, 12:53 PM   #11
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Default Re: Radiator Fan Not working

First chase the wire harness from fan to sensor and ECM check for damaged wiring. Repair if necessary, if it all checks out do the following.

Unplug the fan, with the hood closed bring the engine to temp, check for voltage at the plug if you have voltage at the plug. two wire you should have voltage. If the fan is a single wire connector check the ground location for the fan. If you have voltage at the plug, you most likely need to replace the fan.

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