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Slow operating fan - Heating & Cooling

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Maybe lost a electrical leg somewhere or check capacitor

Posted on Jan 18, 2013

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I have a 2006 Cobalt when I start it something always sounds like a fan runs after the engine runs for about 30 seconds and whatever sounds like a fan running only stays on for about 10 seconds. Can you...


I suspect that it is the operation of a viscous fan hub. Check this by placing your finger on a blade and seeing if you can spin the fan with the engine stopped. It operates when the engine is started and pumps silicone fluid from one side to the other inside the hub and when it has done so the fan slows down in relation to engine speed . Hence the fan noise on starting and then after a short period the fan noise goes away. It will start to operate again when the engine temperature starts to rise when you are stopped at lights or idling for a while to draw air through the radiator to cool the coolant and when you start moving and air is passing through the radiator again it will slow down. If you experience engine overheating while idling have it replaced as it is not pulling enough air through the radiator to do the job

Nov 30, 2013 | Cars & Trucks

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How do I control fan speed?


Keeping the fans clean is especially important, because the fans blow out hot air and bring in fresh air to cool down the laptop.


Fans attract dust, however, which can slow them down, resulting in a hot laptop.

If the laptop overheats, vital parts can cease functioning altogether.


Consequently, keeping your laptop's fans clean is crucial.



The fan speed on a laptop can determine how it operates consistently and reliably.

You can slow it down or speed it up, based on the circumstances.


For instance, slowing down the fan speed may be useful in reserving processes or during a prolonged slow time.


Speeding it up is beneficial in keeping the laptop cool during ongoing use or high-traffic times. For the long term, find a happy medium for regular use, so you won't "psyche" out your computer by constantly adjusting the settings.


Click on the Start menu and select "Control Panel." Next, choose "Performance and Maintenance."


Select "Power Saver."


To slow the fan speed, locate the slider next to "CPU Processing Speed" and slide it down by moving across to the left.


To speed up the fan, move the slider to the right.


Press "Apply" and then "OK," if prompted.


Hope this helps


Nov 08, 2012 | Lenovo IdeaCentre Q150 PC Desktop

1 Answer

Why are the fans not coming on in my 1999 deville


99 Deville - have you checked the large fan fuse(s) under and behind the main fuse/relay box ?? (I think this holds for 99 - 2000+ moved the maxi-fuses to the underhood box on the passenger side.)

Also, are your relays on a mount down near the fans ? Some have had trouble with the wiring/sockets there. 2000 or later moved the relays up to the fuse box itself. There are 3 - Fan 1, Fan 2, and a series/parallel (S/P) relay for slow and fast speeds.

Fans run in SLOW at 224 degrees F, FAST at 236 degrees F if there is no air conditioning or DEFROST function set. In the city or heavy traffic the gauge will go to the first tick mark past 12:00 and the fans come on. As the coolant lowers to 213 degrees F the fans turn off and the cycle repeats.

IF you set an air conditioning function, then fans run in SLOW all the time.

If your fans will not run under any conditions, check the large fuses in the underhood fuse/relay box, as well as the small fuses for the fan relays - there are 3 relays: Fan 1, Fan 2, and S/P (series/parallel): the fans are relay set to series operation (voltage drop) for Slow speed, parallel operation (full voltage) for Fast.

Mar 24, 2012 | 1999 Cadillac DeVille

1 Answer

The processor fan is not operating at proper speeds, it is too slow, and thus the system is overheating.


If the fan is running slow, you will need to change it as soon as possible or it will fry your motherboard. It must be replaced immediately or you run the risk of losing your whole computer.

Aug 29, 2011 | Toshiba Satellite A665-S6093 Laptop

1 Answer

Engine temperature reaches to high before cooling cycle begins


could be a bad temp sensor or faulty thermostat. so by cooling cycle do you mean electric fan, or water circulation. a bad thermostat will slow circulation down causing overheat even if cooling fans are on. a bad sensor will not operate electric fan properly or at all and car will get hot at idle or slow speed and cooler at higher speed. Keep in mind that electric fans can turn on at any given time so KEEP ALL FINGERS AND LOOSE CLOTHIG AWAY at all times.

Apr 02, 2011 | Nissan Sentra Cars & Trucks

1 Answer

Overheating, when at idle or slow speed


check fan operation, my guess is it's not working and the faster you drive the more air cools the rad. When going slow not to much air to cool it off. If engine is hot fan should be on.

Aug 21, 2010 | 1992 Chevrolet Lumina

1 Answer

Fan noise-fan lags speeds up to normal then slows and will eventually stop. This occurs on fan only operation (high and low) and cool high and low.


The bearings,or bushings in the fan motor are gone out,the friction eventually slows,or stops the fan motor.

Jul 01, 2010 | Heating & Cooling

1 Answer

Ceiling fan only operate in slow speed, the medium/high not work


either you do have a defective running capacitor, or fan motor,or try lubricating the fan bushing.

Aug 06, 2009 | Dryers

1 Answer

My PC is very slow


is your heatsink under your cpu fan free of dust? had the same prob and cleaned all the fans and hoovered out and just that made a huge difference.

Jul 29, 2009 | Compaq Computers & Internet

2 Answers

Fan Speed Too Slow


You need to pull the fan chain until it is set to the fast setting, then you use the remote to set the fan at the speed you desire.

May 26, 2009 | Dryers

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