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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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Posted on Jan 02, 2017


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My brother has an 2004 trailblazer he put in a new thermastat and after that the blazer still runs great but now when ever you turn on the fan motor for heat or air . the idle drops down to like 300 or so...

Hello Dennis,

Is this only occurring at Idle? In other words, if at speed, you turn on fan ac controls and it runs fine (until you return to idle such as at a stop light)?

If so, then I would suspect the IAC (Idle Air Control) valve. When you turn on the fan control and the compressor kicks in, the IAC circuit is supposed to maintain the engine idle.

I recommend checking the IAC valve first, then let us know your findings.

Jul 18, 2017 | Chevrolet Blazer Cars & Trucks

1 Answer

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

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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