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Fans running even when computer idle - Toshiba Computers & Internet

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The fans are supposed to run all the time. If they don't, your computer will quickly get hot and burn out the cpu.

Posted on Jun 27, 2008

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Trac Off light and Cooling Fan running on my 2001 Chevy Cavalier


I had the same problem on my 2001 Sunfire (same car as the Cavalier-different branding) which I was able to fix successfully.

My symptoms were:
-Traction Control OFF light illuminated
-Cooling fan running even if engine cold and it was freezing outside (I also noticed that when the Traction light illuminated, the fan would then begin)
-Rough idle with black smoke when cold
-Poor fuel economy


I have a code reader which produced codes P0130 and P0171. These are error codes for the upstream oxygen sensor (the one under the hood).

I simply replaced the O2 sensor (it took me 10 minutes). I did not reset the check engine light after the repair as I wanted to see what the car would do on its own. The idle was much smoother with no smoke and the cooling fan stopped running unnecessarily. After 1/2 mile down the road, the Trac light went away and the system functioned normally. I tested this by trying to accelerate quickly up a snowy driveway. I also noticed that the acceleration and shifting (auto tranny) were smoother. I reset the check engine light. All is satisfactory.


What was happening to the car before the repair:

P0130 is usually for a bad O2 sensor and P0171 is the sensor detected that the motor was running too lean (but it actually wasn't-the sensor was essentially giving a false lean signal).
The rough idle, black smoke, and poor economy are due to running too rich. In my case, the sensor told the PCM (the car's computer) that the air/fuel mixture was too lean. In response, the computer said "OK, more gas!" That's why it ran rich. This was evidenced on the old O2 sensor as well...it was completely caked with carbon from an excessively rich mixture. This further destroyed the performance of the O2 sensor.

Nov 04, 2013 | 2001 Chevrolet Cavalier

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Car running hot when idle


The most common reason for running hot at idle is the radiator fan is not running or pulling enough air thru the radiator. If you have a fan for the engine and one for the ac, the engine fan may not be working.
The radiator fan should come on when the coolant reaches 220 degrees. The computer sends a signal to the fan relay.

May 15, 2013 | 2004 Buick Century

1 Answer

My 02 Camry v6' battery was removed for 30 min and put back on - good battery. Engine starts no problem but stalls at idle. No error code. Is a computer-code reload or IAC cleaning ? Seems the car computer...


idle learn procedure:

turn off all electrical items (AC fan, audio, lights, defogger, etc.)
Start the engine and hold it at 3,000 rpm with no load (in park or Neutral) until the radiator fan comes on or the engine coolant gauge shows normal running temp.

Now let the engine idle for a minimum of 5 mins with no electrical loads. If the radiator fan cycles on during this time, you must add the fan running time to the 5 mins.

Feb 10, 2011 | 2000 Toyota Camry Solara

1 Answer

Overheats while Idling.


there are 3 cooling fan reays in a 98 aurora and they are computer controlled. the low speed fan relay should turn on when the ecu detects a temp of 229 degrees and should turn off when the temp has dropped to 216 degrees. it is best to check the temp with a computer monitor so you can see what the computer is reading. If you turn the a/c on you can see if the fans are operating. If they don't come on with the a/c you may have a problem with the high side a/c switch. A bad thermostat can cause the fans to come on late.

Jul 08, 2010 | 1998 Oldsmobile Aurora

1 Answer

2000 grand am overheats when the car is idle when


If you have A/C, turn it on. The fan(s) should come on immediately. If nothing happens, check that the fan(s) turn freely by hand and don't make any noise (from a bad bearing). Also check the fan relay and fuse. If the computer has a problem, it should show that it has one when a scanner is hooked up to it. The temperature sensor sends a signal to the computer and the computer tells the relay to turn on the fan(s).

Oct 20, 2009 | 2000 Pontiac Grand Am GT

2 Answers

Cooling problems


It sounds like everything is working properly. The temperature will go up when idling. The wter isn't being pumped through the system as fast. When idling, the engine runs at around 750 rpm's. When driving, even at low speeds, the engine speed is at least double that. Make sure your antifreeze is set for at least 20° below zero.

Aug 28, 2009 | 2002 Mitsubishi Lancer

1 Answer

Car runs hot in idle


I would try the themostatic fan clutch

Apr 01, 2009 | Pontiac Firebird Cars & Trucks

1 Answer

1996 buick regal over heating


Hi,
This sounds normal to me..... Except "runs to hot when idling"

When you're driving about (airflow over rad) all seems fine, but when sat in traffic idling - the fans come on to cool. Is the problem that even with the fans running, temperature still goes up - and fans never turn off again?

Is this the problem?

If it is, then the coolant pump may be badly corroded, not driving efficiently, or the coolant needs flushing and replacing.

Jun 15, 2008 | 1996 Buick Regal Olympic Gold

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