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Car Forum / Nissan / Nissan Cars / August 2007

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'94 Sentra Cooling Fan

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TKörner - 10 Aug 2007 05:13 GMT
I discovered this week that one of my radiator cooling fans has been
dead, I have no idea for how long. I only noticed because while sitting in
non-moving traffic in 100 degree weather, I noticed the temperature gauge
creeping up. After resuming driving it went back down to it's normal
horizontal spot. This prompted me to check the fans, and sure enough, the
driver's side one is quite dead.
   My question is this: Do I really need to replace it? I see in Chiltons
that the non A/C models only use one fan, my temperature's fine if the car's
moving or if it's less than 90 outside, there's only another month or so of
summer,  what do you think?
   Is there a difference between the port and starboard fan assys?

Thanks,
           Mike
willshak - 10 Aug 2007 13:52 GMT
on 8/10/2007 12:13 AM TKörner said the following:
>     I discovered this week that one of my radiator cooling fans has been
> dead, I have no idea for how long. I only noticed because while sitting in
[quoted text clipped - 10 lines]
> Thanks,
>             Mike

Have you thought about having it checked? It may be something simple,
like a dirty connection.

Signature

Bill
In Hamptonburgh, NY
To email, remove the double zeroes after @

TKörner - 10 Aug 2007 15:05 GMT
> on 8/10/2007 12:13 AM TKörner said the following:

> Have you thought about having it checked? It may be something simple, like
> a dirty connection.

I removed it, and it's getting 14 volts at the connector, but when I spin
the fan manually it doesn't spin freely, it's rough with a scratchy noise. I
thing the motor has gone bad.

Mike
willshak - 10 Aug 2007 18:10 GMT
on 8/10/2007 10:05 AM TKörner said the following:
>  
>> on 8/10/2007 12:13 AM TKörner said the following:
[quoted text clipped - 9 lines]
>
> Mike

Look for an electric motor repair shop in your Yellow pages. They can
replace brushes or bearings, and it will probably cost less to fix than
buying a new Nissan fan unit.

Signature

Bill
In Hamptonburgh, NY
To email, remove the double zeroes after @

TKörner - 13 Aug 2007 23:27 GMT
> on 8/10/2007 10:05 AM TKörner said the following:
>>
[quoted text clipped - 12 lines]
> replace brushes or bearings, and it will probably cost less to fix than
> buying a new Nissan fan unit.

   I bit the bullet and bought a new fan assembly. $66, easy installation,
better safe than sorry.

Mike
nucleus - 10 Aug 2007 15:56 GMT
u definitely need to fix the problem, engines operate best at a fixed
temperature.  the engine cooling fan is generally the larger one.
the other one is the AC condensor fan.

check continuity on ur fan motor or apply jumpers from battery to fan
motor (to test motor), check fuse or relay (whichever your model
has), check temp sender.  the cooling fan is controlled by the
ECCS module using inputs from the temp sensor, the VSS, and
the AC "on" signal.
TKörner - 13 Aug 2007 23:34 GMT
>u definitely need to fix the problem, engines operate best at a fixed
> temperature.  the engine cooling fan is generally the larger one.
[quoted text clipped - 5 lines]
> ECCS module using inputs from the temp sensor, the VSS, and
> the AC "on" signal.

I replaced the fan assy, and all is well, but just out of curiosity, my fans
appear to be the same size, is there a difference? They both are  controlled
by the temp sensor and the A/C, I've not seen one run without the other
(except when the one was dead). What is VSS?

Mike
nucleus - 14 Aug 2007 17:29 GMT
On Aug 13, 5:34 pm, "TK?rner" <bgegyrem...@yahoo.net> wrote:
> > temperature.  the engine cooling fan is generally the larger one.
> > the other one is the AC condensor fan.
[quoted text clipped - 11 lines]
>
> Mike

my apologies, the 94 sentra fan assy's appear to be the same size, the
size difference apparently applies to earlier sentra models.

the passenger side fan is on models with AC.  all models have
the driver side fan.

VSS is vehicle speed sensor.  if the design engineers did a prudent
job,
the fans should not operate at highway speeds, unless certain
conditions
require their operation.
TKörner - 14 Aug 2007 23:07 GMT
On Aug 13, 5:34 pm, "TKörner" <bgegyrem...@yahoo.net> wrote:
> > definitely need to fix the problem, engines operate best at a fixed
> > > temperature.  the engine cooling fan is generally the larger one.
[quoted text clipped - 13 lines]
> > (except when the one was dead). What is VSS?
> > Mike

> my apologies, the 94 sentra fan assy's appear to be the same size, the
> size difference apparently applies to earlier sentra models.

> the passenger side fan is on models with AC.  all models have
> the driver side fan.

> VSS is vehicle speed sensor.  if the design engineers did a prudent
> job,
> the fans should not operate at highway speeds, unless certain
> conditions
> require their operation.

Ah, that makes sense. Thanks.
 
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