Question about Dell OptiPlex GX620n PC Desktop
I've had this PC for about three years and the cooling fan hardly ever ran. Then a few months ago when ever you turn on the machine the fan would come on at full speed. I opened the case and using canned air I blew out the dust from the CPU heat sink and the power supply. This did help and now the fan runs about half speed. If I touch the heat sink it isn't even slightly warm. Any help would be appreciated, since I'm going deaf !
Thanks in advance,
A few possible solutions.
You said that you got some canned air to blew it out... what I normally like to do is simply use a vacuum and **** up as much dust as possible (besides who wants dust in your face?). Once that is done, I would advise that you take off the fan from the CPU cooler itself and get in there with either the canned air or vacuum... simply because with the fan still attached, there is possibly still a layer to caked dust under the fan and on top of the heat sink.
If it is any of the other case fans, I would either get in there and vacuum them out really good or simply replace them. My computer use to sound like a jet engine after 2 years but when I replaced my fans (with cool blue LED ones) it was significantly (can't stress enough) quieter. Most fans are of course using ball bearings, so if you can imagine the bearings getting a good layer of dust in them as well...
Posted on Apr 17, 2009
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Posted on Jan 02, 2017
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A/C refrigerant pressure exceeds 1 310 kPa (190 psi).
After the vehicle is shut off if the engine coolant temperature at key-off is greater than 140?°C (284?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.
The BCM and PCM/ECM command High Speed Fans on under the following conditions:
Engine coolant temperature reaches 110?°C (230?°F).
A/C refrigerant pressure exceeds 1 655 kPa (240 psi).
When certain DTCs set.
The three relays are located in the under hood fuse / relay box ! You need to have it checked for DTC'S -diagnostic trouble codes ! An you need a GM Tech 2 scan tool !
This diagnostic procedure supports the following DTCs:
DTC P0480 Cooling Fan 1 Relay Control Circuit
DTC P0481 Cooling Fan 2 and 3 or S/P Relay Control Circuit
DTC P0691 Cooling Fan 1 Relay Control Circuit Low Voltage
DTC P0692 Cooling Fan 1 Relay Control Circuit High Voltage
DTC P0693 Cooling Fan 2 and 3 or S/P Relay Control Circuit Low Voltage
DTC P0694 Cooling Fan 2 and 3 or S/P Relay Control Circuit High Voltage
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