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loud roar from fan on startup and during driving
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paradigm



Joined: 21 Feb 2018
Posts: 56

PostPosted: Wed Jan 09, 2019 9:25 am    Post subject: loud roar from fan on startup and during driving Reply with quote

My 2010 Pathfinder 4.0L literally roars everywhere I go. On startup it roars to life with the fan being extremely loud, and then during regular driving the fan roars along with the speed of the engine. Initially I liked this, but I am sure it is sucking a good amount of fuel economy away.

Any idea on how to quiet it down and possibly re-gain some fuel economy?

Fuel economy on this truck is absolutely horrendous. I am getting 220 miles on a full tank, mainly city driving. That is terrible.
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grm3



Joined: 30 Dec 2010
Posts: 22

PostPosted: Wed Jan 09, 2019 11:48 am    Post subject: Reply with quote

Sounds like it's time for a new fan clutch.
Had to replace mine a few years ago. Go with a genuine Nissan replacement. I tried aftermarket first and wound up having to replace that with a Nissan.
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underworld1001



Joined: 27 Nov 2016
Posts: 238
Location: Austin, TX

PostPosted: Wed Jan 09, 2019 7:48 pm    Post subject: Reply with quote

Hate to promote what some consider snake oil, but I did SeaFoam my engine and then poured some Berrymans B-12 into the tank and got a nice bump in gas mileage. Previously I was getting around 240ish if I remember correctly. Now I'm around the 270-280 mark. I usually fill up around 18 gallons so that divided by 270 comes out to about 15 mpg. Not the best, but it's good for a heavy truck.

I'm about the change plugs this weekend so hoping that helps me a bit too. Though about changing the upsteam O2 sensors as well, but they're a little too pricey to change, "just because".
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2011 SV V6 - BF Goodrich KO2 LT265/75 17-C, StopTech slotted rotors (934.42044), AEM DryFlow drop-in air filter (28-20286), free air box mod, Xtreme Truck Performance IMS (http://extremetruckperformance.com/?page_id=6), Bilstein 4600's (F-24-197427 / R-24-197434), Moog springs (F-81280 / R-81119 ), CSF aluminum radiator (7029)
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palmerwmd
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Joined: 31 Jan 2017
Posts: 788
Location: Virginia

PostPosted: Wed Jan 09, 2019 9:47 pm    Post subject: Reply with quote

Careful with Berrymans on older vehicles, its pretty harsh solvent based.

Seafoam is much safer to put in the tank.
Techron is good. and BG44k is probably the best (Source: I am a chemist)
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2012 V6 4WD, in Grey over Grey
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paradigm



Joined: 21 Feb 2018
Posts: 56

PostPosted: Tue Jan 22, 2019 8:19 am    Post subject: Reply with quote

Sounds like I will need to do a seafoam on the truck, but definitely need to change the fan clutch. Seems like is locked and causing the mechanical fan to spin 100% of the time, which will kill fuel economy.
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smj999smj
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Joined: 22 Jan 2012
Posts: 5219
Location: Prospect, VA

PostPosted: Tue Jan 22, 2019 10:38 am    Post subject: Reply with quote

Typical bad fan clutch issue. As already mentioned, stick with genuine Nissan. There have been a lot of reported problems with the aftermarket replacements.
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2006 Pathfinder LE VQ40DE AWD, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks, Doug Thorley shortie headers and mid-pipes, Magnaflow 12580 muffler, aFe Momentum GT CAI w/ dry filter, XTP plenum spacer, Superchips Flashpaq tuner
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BullDozer



Joined: 17 Jan 2016
Posts: 137
Location: Detroit, Michigan

PostPosted: Wed Jan 23, 2019 7:32 pm    Post subject: Reply with quote

So how can do you tell if too loud and fun clutch needs replaced?
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paradigm



Joined: 21 Feb 2018
Posts: 56

PostPosted: Thu Jan 24, 2019 5:25 am    Post subject: Reply with quote

BullDozer wrote:
So how can do you tell if too loud and fun clutch needs replaced?


In Queens NYC there are a ton of these R51 pathfinders for some reason. Many of them are quiet at idle and at low RPM's around town. Mine on the other hand sounds like a garbage truck. It is always roaring at low RPM's and the rad fan seems to be blowing at full blast...when I open the engine bay and stand over the fan or go under the fan its pushing a ton of air at idle.
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elementZ



Joined: 23 Oct 2017
Posts: 7

PostPosted: Thu Jan 24, 2019 8:35 am    Post subject: Reply with quote

BullDozer wrote:
So how can do you tell if too loud and fun clutch needs replaced?


If you have a working clutch, on cold start the fan should essentially be free spinning a few seconds after startup. The fan should not be moving any air.
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BullDozer



Joined: 17 Jan 2016
Posts: 137
Location: Detroit, Michigan

PostPosted: Thu Jan 24, 2019 9:58 am    Post subject: Reply with quote

elementZ wrote:
BullDozer wrote:
So how can do you tell if too loud and fun clutch needs replaced?


If you have a working clutch, on cold start the fan should essentially be free spinning a few seconds after startup. The fan should not be moving any air.


Are you saying the fan should not be spinning all the time?
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2006 SE 4.0 4x4
Rancho quick strut front
Armada rear springs, Rancho rear shocks
265/75 R16 Cooper AT3
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underworld1001



Joined: 27 Nov 2016
Posts: 238
Location: Austin, TX

PostPosted: Tue Jan 29, 2019 8:28 pm    Post subject: Reply with quote

BullDozer wrote:
elementZ wrote:
BullDozer wrote:
So how can do you tell if too loud and fun clutch needs replaced?


If you have a working clutch, on cold start the fan should essentially be free spinning a few seconds after startup. The fan should not be moving any air.


Are you saying the fan should not be spinning all the time?


bump. I'm curious too.
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2011 SV V6 - BF Goodrich KO2 LT265/75 17-C, StopTech slotted rotors (934.42044), AEM DryFlow drop-in air filter (28-20286), free air box mod, Xtreme Truck Performance IMS (http://extremetruckperformance.com/?page_id=6), Bilstein 4600's (F-24-197427 / R-24-197434), Moog springs (F-81280 / R-81119 ), CSF aluminum radiator (7029)
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smj999smj
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Joined: 22 Jan 2012
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Location: Prospect, VA

PostPosted: Tue Jan 29, 2019 9:20 pm    Post subject: Reply with quote

It'll spin...but freewheeling and at a slower speed than it would if the clutch were engaged and causing the fan to pull the air through the radiator core. The only time I hear my mechanical fan is for a second when I first start up and also when I come to a stop after driving a while and sit at idle, as when I go through a drive-thru line at a fast food joint or at the bank. It happens more so in hot weather.
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2006 Pathfinder LE VQ40DE AWD, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks, Doug Thorley shortie headers and mid-pipes, Magnaflow 12580 muffler, aFe Momentum GT CAI w/ dry filter, XTP plenum spacer, Superchips Flashpaq tuner
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weaver



Joined: 25 Jan 2019
Posts: 33
Location: Ohio

PostPosted: Wed Feb 06, 2019 11:07 pm    Post subject: one more thing to check Reply with quote

Great info as always smj. Wish you my neighbor! While tearing things down today to do t stat, belt, tensioner,hoses tranny lines ( amongst other things) etc when I pulled the fan off of the clutch, what I thought was normal grime was actually hard packed sand in every nook in fan. Space between the stat housing and timing cover was also packed solid with oily sand. Just bought Pathfinder last month and finally got to work on her, so didn't see this before now. Never seen anything like it. Looks like she was dropped from a C47 nose first into into a beach. I'll bet that it will be quieter now that it's clean, and maybe mileage will be a smidge better. It sounds obvious but double check for heavy grime in and around fan. This could cause noise and in my case put extra wear on clutch and bearings, maybe the extra weight could interfere with clutch operation (there really was that much crap in there!)
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08 R-51 SE VQ40DE 4wd stnd, restoring to stock and slightly upragrding.D.O.P. 1-19, so far:spectra rad,all LED;(excld hls)t-stat,cooler lines, skid plates,resv tank,TPMStrnsmtrs, upgrading corroded hardware;list:Air 1000, Bilstein shocks, 7pin trailer conn,lighting & switching mods, various restos,MX-7000 light bar,new exhaust
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paradigm



Joined: 21 Feb 2018
Posts: 56

PostPosted: Tue Feb 19, 2019 8:21 am    Post subject: Reply with quote

I replaced the fan clutch this past weekend with an OEM unit, and the truck is extremely quiet now.

However my heat isn't working. I removed the radiator top hose to wiggle out the upper rad shroud, and in the process spilled some rad fluid. Is it possible I either introduced air in the system, or I am low on rad fluid which is adversely impacting the heating?
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smj999smj
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Joined: 22 Jan 2012
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Location: Prospect, VA

PostPosted: Tue Feb 19, 2019 11:04 am    Post subject: Reply with quote

Top off the coolant and purge the air out of the system. Make sure you didn't mix up the coolant reservoir and radiator caps; the reservoir cap will have a spring on it and the radiator cap will not.
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2006 Pathfinder LE VQ40DE AWD, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks, Doug Thorley shortie headers and mid-pipes, Magnaflow 12580 muffler, aFe Momentum GT CAI w/ dry filter, XTP plenum spacer, Superchips Flashpaq tuner
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