Posted: Sep 28 2009 at 10:14am | IP Logged

Im new to the site and new to the Frontier world.  I just bought a 2005 Nismo Frontier about 3 months ago.  I am curious  as to why it is so loud?  the exhaust isnt loud its just the engine it self sounds like there are tons of fans running.  I took it to the Nissan place to get the oil changed and I asked and they had no idea.  He started his which is a 2008 and not a Nismo and it wasnt near as loud.  Im thinking its geared different because of the Nismo but Im not sure.  Any help with this would be great.  Its not causing any problems or anything I wanted to know if its just loud or if the previous owner programmed it different.

Posted: Sep 29 2009 at 4:42pm | IP Logged

It is probably the fan you are hearing.  The thermally  controlled fan clutch is engaging when you start the engine; it should only work when the engine is hot although mine engages if the truck is not run for 4-5 days on starting.  The clutch is generally a fluid that increase rapidly in viscosity as it gets warm.  This allows your fan to spin very slowly at low engine temps or when you are going down the road with lots of air flowing through the radiator.  In heavy, slow traffic, the air coming through the radiator gets hptter, the clutch engages and now spins at around engine RPM to get air flowing.  This will sound like a large truck engine.

I would tell the dealer you think the fan clutch is problematic and turning on whenever you run the truck.