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Old 05-30-2007, 01:03 PM   #1
Glasact
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2009 AURA XR
2002 L-Series 2.2L Sedan
Default Radiator Cooling Fan

The electric radiator cooling fan on my 2000 LS-2 (V6) cycles on and off continuously. It comes on for about 15-20 secs. and then off for about 30 secs. The Ambient temperature has been in the upper 70's to the mid 80's. The cooling resevoir is topped of at the full mark with a 50% mix of dex-cool and the temperature indicator never goes above the 10:00 o;clock position on the instrument panel. It is not showing any signs of overheating at all excect the crazy cycling of the fan. I will also add that the fan cycling starts about 8 minutes after starting a cold engine. Just eneough time to warm up good. I'm guessing it is probably a bad sensor of some sort, but I just don't know where to start looking.

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Old 05-30-2007, 01:24 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: Radiator Cooling Fan

Other than the temperature sensor and the a/c circuit affecting when the fan runs the fan relay is the main switch to allow current for the fan to run. Try swapping the fan relay with another relay in the fuse box.

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Old 05-30-2007, 07:41 PM   #3
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2000 L-Series 2.2L Sedan
2000 L-Series 2.2L Wagon
Default Re: Radiator Cooling Fan

When my thermostat failed it caused the radiator fan to run continously (winter). I unplugged it, but this brought on a CEL. Fix was to replace the 'stat.

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Old 06-04-2007, 12:18 PM   #4
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Default Re: Radiator Cooling Fan

I swapped the fan relay with the horn relay in the underhood fuse panel. I think that was it. The fan hasn't been cycling since, but the outside temp has dropped too. The horn is working fine but, should I replace that relay anyway?

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Old 06-04-2007, 01:23 PM   #5
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Default Re: Radiator Cooling Fan

Let a few more days go by and see, the relay contacts/solenoid may have been borderline for use in the radiator fan circuit but hardly strains in use as a horn relay. In return the hardly strained horn relay is now being counted on for heavy duty use to switch the fan on/off; the fan uses more current and the relay contacts wear a bit more because of it. It may not be worth replacing the relay yet, time will tell.

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