'94 Sentra Cooling Fan

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

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.

on 8/10/2007 10:05 AM TKörner said the following:

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.

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

Mike

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

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.