I'm not talking about the noise of rushing air because these fans move some serious amounts of air. I'm talking about strange noises like the aux. fan is about to dislodge. This problem is becoming very common (according to my service department) after the trucks get a few miles on them. This problem is not limited to the Titan, it's VERY common on the Armada as well...go figure.. :D

Anyhow, the Aux. fan is only held on with one screw at the very top of the housing, the bottom is held in by two posts at the bottom of the fan housing that slide down into the plastic frame that also holds the radiator and condensor. Over time these bottom mounts get loose and that's when the weird noises start.
http://us3.pixagogo.com/S5rgQ7KLjNs2dpec1p-rFGOanudJfBE6sVHo8KLpusnx501lOzr4%21xjsXH3VEBTOVGe CWdCpJB4jvZPwKM48%21b70uh5pOuW4Zw/Aux_Fan_01.jpg
http://us2.pixagogo.com/S5rgQ7KLjNs2dyp0JvakNyii0ZLdLmVZB2Ke1e3vJeYr6ynurZ cJ3c2Xk%21RS8IuieP7%21L4Pck9Q0H0nXSjnpVe4IFgqzZHP0 Qg/Aux_Fan_02.jpg
To check if your aux. fan is loose, first turn the vehicle off, reach into the lower grill opening and grab the fan housing. If the bottom moves side to side or fore and aft than it's loose.

Here's some pictures I took of this mod of which only takes about 30 minutes to do. If the pics aren't big enough just go to my pic site and the full size pics will be there.

Have Fun and let me know if this mod helps anyone else out there in Titan land!!
http://us10.pixagogo.com/S5rgQ7KLjNs2ecMUl%21PGcOU6XMOBRltraTyL%21O8O%21eN9 HzKhq7d-F6LZJwKnsSiYWm-SXoJEl94U1HVWnN%21lNaKYzAgP6C8pan/Aux_Fan_03.jpg
http://us10.pixagogo.com/S5rgQ7KLjNs2fLpT1jm%21vrzRhIAtOb-PnD2HmE1UfaC%21chBOFBo6OZdGnWLU2lShGzdURaJDlSQDcmV-bxWIuPypHAmnAFxp2g/Aux_Fan_04.jpg
http://us4.pixagogo.com/S5rgQ7KLjNs2fG-RhH0zGR00f9nMtUXmyhCQ%213zauFz7d%21T40JQgH1ZtugXvJ s9nRcy02RGot35RkyU1GvF%21IMrUqaC3WtKAOb/Aux_Fan_05.jpg
http://us3.pixagogo.com/S5rgQ7KLjNs2eBxGIR0ddMjTyqnqE3xzZMOEAt7kjXXnivEIxf RJ0zJmLII5V6-sqeyfyO70%21ufpeElEQZOF%21mZ-ZLpKcpYp3c/Aux_Fan_06.jpg

http://us1.pixagogo.com/Tools/Thumbnails.aspx?thumb=S5ELkie68-%21s-dIXZDEVB-lCVeTJuHu6znPEK%211VPaCTDOx2z2FnC0f%21LPum86LYIcge BD0JEwA44B0-290SKpphnKoHbcrevNDI9yTqh2JKBlTNAX8uYBOw0RXrUto1HK

http://us1.pixagogo.com/Tools/Thumbnails.aspx?thumb=S5ELkie68-%21s9Y43vjjTDWii9QJr3UIDQ226-zc-CYJLIy54owybPl4Bz3aipYIaL7sWJURRCbMkkn5-LKPxUVeLCLV1F%21vNYW4gM0%21x1sd69RggepzOJyNzb26O2c h5XR

http://us1.pixagogo.com/Tools/Thumbnails.aspx?thumb=S5ELkie68-%21s-oa2WNN8SHPOhb9Mr13GJ1lDONf9dEpfyXwmyVhaOzQF0n9nWqf oxvM5R4THEBy-qF9FWJXC91MzoDOM3Sqqf337JIP3Z-J4XGWaermSYKyybi93quQJ-M

http://us1.pixagogo.com/Tools/Thumbnails.aspx?thumb=S5ELkie68-%21s-ySmeA%21yOjGp4zti9QMDhO6sWRPqhbbH%21vd5wcJHcPY%217 GuaLgzMrtdoeC54h5FXF39RiaHjZ8V0L-nWQJHP-4EHsy9pfPPlNcdOMjvBUnLJ1DSR%21yxMmz

http://us1.pixagogo.com/Tools/Thumbnails.aspx?thumb=S5ELkie68-%21s8ZhX9Vvo0Ooah06LIJ-R6LU5ZYidHSu4gUvbLpulJaIZCw3cA5K9VHcL5Jg8y75NOVQLZ 52oPf%21KT%21XVuj62oiELFyQXIRbBWY-I2yPU8h2tyrD9R8oEXu

http://us1.pixagogo.com/Tools/Thumbnails.aspx?thumb=S5ELkie68-%21s%21yZMUKzwOGt7xM05JmBXv3Rm0jEJd%21C53C6ZL5O9HR GibLm%21I8YKiu0cnu8OkNhzFe-YhbMbHaVf-DdKQkJYhw6VsZlD9ZlgF2rrE7vfXsCdFDFbqFTdw8

Nice man. All I want to know is what designer thought it would be a good idea to use 1 screw to hold that thing in like that. lol
M4ck

One screw, wow.
nice work again Dale, as usual.

Dale,

First of all - you're a genius for figuring this out. You have quite the mechanical mind, my friend.

Second, am I going to need to take off the skid plate to get to those bottom two "screws"?

Third, why am I bending up the one washer? How did you do it?

Finally, I don't know why this post is so unpopular (maybe it is popular but no one posts about it). I would think this is probably affecting most Titan owners. I'm actually surprised there isn't a TSB for it - although maybe it's because it's hard to a) pinpoint the noise and b) it's inconsistent, so it'd be difficult to replicate at the dealer.

THANKS!

Justin

Dale,

Second, am I going to need to take off the skid plate to get to those bottom two "screws"?

Third, why am I bending up the one washer? How did you do it?



-Yes

- The screw would walk more than likely so the bent washer helps lock it into place. If you have a big set of pliers or a vise you can bend a washer...they actually bend pretty easy. Maybe we can get together soon and knock out both of our trucks at the same time.

Dale,

Second, am I going to need to take off the skid plate to get to those bottom two "screws"?

Third, why am I bending up the one washer? How did you do it?



-Yes

- The screw would walk more than likely so the bent washer helps lock it into place. If you have a big set of pliers or a vise you can bend a washer...they actually bend pretty easy. Maybe we can get together soon and knock out both of our trucks at the same time.cool - thanks Bry! We'll talk.

To check if your aux. fan is loose, first turn the vehicle off, reach into the lower grill opening and grab the fan housing. If the bottom moves side to side or fore and aft than it's loose.

JT always giving solid advice - make sure that vehicle is off before you go sticking your hands in the fan....

:roflmao:

good timing to find this post, i just noticed the other day that my fan is rattleing, thanks fer the info, wish nissan could have told me things like this lol

Tech, and I use the term LOOSLY, are only alowed to change parts. Never really fix a problem. So if you can find a " tech " that will really find a solution for a problem, PAY THEM WELL AND KEEP THEM HAPPY. You may never find another..
BTW Dale, I did the same thing to My Precious I just didn't use silicon, I used SS hardware and put 304 lock-tite in them..

Jettech:

As I was installing the coolant bypass for my truck today, I tugged and tugged fore and aft on my electric fan to no avail!! Do you think they knew about this problem or has mine not come loose yet?? :)

Jettech:

As I was installing the coolant bypass for my truck today, I tugged and tugged fore and aft on my electric fan to no avail!! Do you think they knew about this problem or has mine not come loose yet?? :)

It sounds like yours is still tight in the bracket. As a matter of fact the aux. fan on my 4x4 is still tight in it's bracket as well (18K miles on it). This problem was one I had on my first Titan. So who knows, some will loosen up, some not...

Looks like I too may be doing this mod. I can hear the aux fan make some weird noise (sounds like something is vibrating) when I am at a stop with the a/c on.

Looks like I too may be doing this mod. I can hear the aux fan make some weird noise (sounds like something is vibrating) when I am at a stop with the a/c on.

That's the sound getsom......I can't believe my 4x4 hasn't done it yet but when it does I will do this mod to it. It only takes a few minutes and will quiet everything back to normal. Good luck......

Thanks JetTech, I've been wondering what that noise was. It sounded like the fan clutch was coming apart but was tight. I'll check mine tomorrow in the light of day. If I understand the problem correctly, the lug holes wear out allowing the lugs to move about causing the vibration everyone hears and feels? The fix is with the bent washer set-up pulling the lug into the mounting hole securing it from moving. Am I close? Thanks again..

Thanks JetTech, I've been wondering what that noise was. It sounded like the fan clutch was coming apart but was tight. I'll check mine tomorrow in the light of day. If I understand the problem correctly, the lug holes wear out allowing the lugs to move about causing the vibration everyone hears and feels? The fix is with the bent washer set-up pulling the lug into the mounting hole securing it from moving. Am I close? Thanks again..

That's the ticket...let us know if it works for you too..

I couldn't wait untill morning so when I got off work last night I reached in and gave the fan housing a tug. Sure enough.. it has about a .030 movement side to side. Thanks again for a good fix to an annoying rumble.

just heard from the dealer. I brought the Titan in for the brake "fix" and he asked me if I had heard a rumbling in the front with the ac on. Before I could say I had a fix for that he tells me he had the tech replace the fan bushings. So I'll pick up the truck tomorrow and see if:
1) the new brakes are as good as everyone says and
2) see if they did the JetTech "fix" to the aux. fan

Looking forward to seeing what you find about the fan bushings ... mine has a loud occasional rattling with the A/C on and the fan is loose ... haven't gotten around to trying to fix it yet and the dealer said "could not replicate"

Hello JET TECH........I see this fan called an auxillary fan..... :roll:
I have heard it called the tranny and the AC fan... :roll:
Just what turns it on and off and is it for the AC or tranny or what? :?:
I'm not sure if mine is really loose but I bought the screws and washers you have listed to prevent any rattles. My Titan has a rattle somewhere up front and under the hood and only on rail-road ballast and road bond surfaced roads....My SM recently replaced a tie-rod in hopes that it was causing the rattle but it did not solve it.
Thanks for any input/help!
Peace-Tom

Dale,

First of all - you're a genius for figuring this out. You have quite the mechanical mind, my friend.

Second, am I going to need to take off the skid plate to get to those bottom two "screws"?

Third, why am I bending up the one washer? How did you do it?

Finally, I don't know why this post is so unpopular (maybe it is popular but no one posts about it). I would think this is probably affecting most Titan owners. I'm actually surprised there isn't a TSB for it - although maybe it's because it's hard to a) pinpoint the noise and b) it's inconsistent, so it'd be difficult to replicate at the dealer.

THANKS!

Justin
I just did the mod.....hope it's OK to chime in on question #2 for trogdor as I don't think anyone has yet......yes the skid plate will have to come off.....the front of it has 4 ( 2 on each side) front bolts that need a 5/16" hex key to remove.....the back of the plate hs two bolts that a 10 mm socket will work with but had some play so I used a small adjustable wrench instead. They don't have to be completely removed as the back of the plate is slotted.
Well it's back together and now the fan has 0-play!! Can't wait to see if that solves the back-roads rattle!!
Thanks JET-TECH.!!!! :D
Peace-Tom ------> CHEERS Highland Beer CHEERS<------

Thanks man (jet tech)! That aux noise been bothering me for weeks. I only have 4000+ miles on my truck when it started ratling (could not believe this has happen to a new truck).

I worked on it last Saturday after cleaning my truck first, then took my wrench, flash light and bended washer and walla!!! Its good as new!!!

go jet!!

My truck is making that annoying fan noise too.
Here is my question.
Won't the dealership fix it for me?
I dread the thought of getting under the truck and playing around with nuts and bolts.
I am afraid I would screw something up.

I'm not talking about the noise of rushing air because these fans move some serious amounts of air. I'm talking about strange noises like the aux. fan is about to dislodge. This problem is becoming very common (according to my service department) after the trucks get a few miles on them. This problem is not limited to the Titan, it's VERY common on the Armada as well...go figure.. :D

Anyhow, the Aux. fan is only held on with one screw at the very top of the housing, the bottom is held in by two posts at the bottom of the fan housing that slide down into the plastic frame that also holds the radiator and condensor. Over time these bottom mounts get loose and that's when the weird noises start.

To check if your aux. fan is loose, first turn the vehicle off, reach into the lower grill opening and grab the fan housing. If the bottom moves side to side or fore and aft than it's loose.

Here's some pictures I took of this mod of which only takes about 30 minutes to do. If the pics aren't big enough just go to my pic site and the full size pics will be there.

Have Fun and let me know if this mod helps anyone else out there in Titan land!!

http://us1.pixagogo.com/Tools/Thumbnails.aspx?thumb=S5ELkie68-!s-dIXZDEVB-lCVeTJuHu6znPEK!1VPaCTDOx2z2FnC0f!LPum86LYIcgeBD0J EwA44B0-290SKpphnKoHbcrevNDI9yTqh2JKBlTNAX8uYBOw0RXrUto1HK

http://us1.pixagogo.com/Tools/Thumbnails.aspx?thumb=S5ELkie68-!s9Y43vjjTDWii9QJr3UIDQ226-zc-CYJLIy54owybPl4Bz3aipYIaL7sWJURRCbMkkn5-LKPxUVeLCLV1F!vNYW4gM0!x1sd69RggepzOJyNzb26O2ch5XR

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http://us1.pixagogo.com/Tools/Thumbnails.aspx?thumb=S5ELkie68-!s-ySmeA!yOjGp4zti9QMDhO6sWRPqhbbH!vd5wcJHcPY!7GuaLgz MrtdoeC54h5FXF39RiaHjZ8V0L-nWQJHP-4EHsy9pfPPlNcdOMjvBUnLJ1DSR!yxMmz

http://us1.pixagogo.com/Tools/Thumbnails.aspx?thumb=S5ELkie68-!s8ZhX9Vvo0Ooah06LIJ-R6LU5ZYidHSu4gUvbLpulJaIZCw3cA5K9VHcL5Jg8y75NOVQLZ 52oPf!KT!XVuj62oiELFyQXIRbBWY-I2yPU8h2tyrD9R8oEXu

http://us1.pixagogo.com/Tools/Thumbnails.aspx?thumb=S5ELkie68-!s!yZMUKzwOGt7xM05JmBXv3Rm0jEJd!C53C6ZL5O9HRGibLm! I8YKiu0cnu8OkNhzFe-YhbMbHaVf-DdKQkJYhw6VsZlD9ZlgF2rrE7vfXsCdFDFbqFTdw8

Can anyone explain how the washers are setup? Hard to tell from the pics, especially when your an idiot like me :P

Can anyone explain how the washers are setup? Hard to tell from the pics, especially when your an idiot like me :P Let me see if I can explain what the bent washers are for. Refer to the crude attached sketch.
The green is the part of the fan frame that goes through the hole in the support, the blue part. The bent washer is red, it is fasened by the black screw. Since the green part sticks through the blue support a short distance, there would still be slack in the mount if you just put a flat washer and screw on the end of the green part. The red washer is bent so that its bent edges will contact the blue support, pulling the green bracket down tight. I did not show the smaller flat washers in the sketch. They install between the bent washer and the screw head, since the hole in the bent washer is too large for the screw head.

My truck is making that annoying fan noise too.
Here is my question.
Won't the dealership fix it for me?
I dread the thought of getting under the truck and playing around with nuts and bolts.
I am afraid I would screw something up.

It wont hurt to take it to the dealer and ask. I would think any loose part on your truck would be covered under warranty, especially if something is broken down there. I say what the heck, take it and ask.

TP

does anyone have any pictures of this as the ones that were posted do not show up and a write up would be cool
Thanks in advance
Miguel

yes same here,,,all i get for pics is boxes with lil x's in em.......i had this prob too,,,it mysteryiously has vanished for now....after looking at it, i just see a design flaw. in my opinion the two bottom posts of the fan should be contained in a rubber style mount, but i am curious to see the fix posted that everyone is happy about. mine is gone but im sure it will return one day soon.....i was about to pull the fan, and seal the bottom with a lil duct tape and fill the holes with some black silicone ,reinstall and let it set till it forms like a a shock/mount, remove the tape after it sets up,or just leave it. it sounds cheezy,lol,,,thats why im hoping to see these pics ya'll got, id rather not burn a day in and out of the dealer for a 20 minute fix i can do myself!....im sure there will be a tsb if theres not by now, but it just looks like they rubber grommeted the top, and never figured the bottom would be a prob.... let me know what im doing wrong not to see the "fix pics"....ty guys

http://www.pixagogo.com/jetmechanic See the pic group titled "Nissan Titan LE" Its the last few pics in the group.

JetTec is the man. My truck just went past 36,000 and I was almost home today stopped at a light and I thought the car in front of my was loud, but I would check my truck when I got home just to be sure. I went to the front and it quit about the time I got around there. I went back and turned the ac back on and found the fan was loose. I typed in noisy fan on the search and this thread popped up. All I can say is it took longer to find the washers than to do the mod. Thank You! It worked like a charm.

JetTec is the man. My truck just went past 36,000 and I was almost home today stopped at a light and I thought the car in front of my was loud, but I would check my truck when I got home just to be sure. I went to the front and it quit about the time I got around there. I went back and turned the ac back on and found the fan was loose. I typed in noisy fan on the search and this thread popped up. All I can say is it took longer to find the washers than to do the mod. Thank You! It worked like a charm.

I noticed mine doing this a little just a while back. Wasnt bad and didn't seem like it was very often. Then about a week ago I sat in the truck waiting for my wife to go in the pharmacy and pick up some medicine. She was in the store about 10 minutes. It was really hot out and had the air going and the radio on. I was sitting back relaxing and then felt the truck vibrating. I thought it was someones radio making it shake then it kept continuing. I sit up look around turn the truck off and goes away. So I crank it back up and it starts again. I was like oh no what is this. I had just had the Nitrous installation done and had only sprayed a couple times. I figured I had already done something that messed the truck up. Well I didn't. It was this darn fan. I remember JT's how to and got on here checked it out got the stuff I needed and worked great. Only thing I did differently was instead of silicone after the installation I used JB Weld. I mixed a glob of it up and molded it around and under the washers and gaps between plastic and washer. It held great and is like concrete there now. I have no more rattle and the fan is very secure now.
Thanks JT

I put on a really thick coat of the rubberized undercoating afterward, but I was also like "oh no, what is loose or broken right after the warranty was up", lol

Thank you JetTech, my aux fan has been making some strange noises for a while... I appreciate you taking the time and doing a write up on how to fix it... The first time I heard it; I was cussing and thinking that I was going to have to spend a bunch of cash on my Titan. Not with your write up; I'm going to give it a try to fix it, and I'll report back. Thank you again!!!!!

I put on a really thick coat of the rubberized undercoating afterward, but I was also like "oh no, what is loose or broken right after the warranty was up", lol

I wouldnt worry. Might find a few pieces squeaking here and there but you can track them down. I have almost 48k on my truck now and I feel like its just breaking in. Faster than ever and solid as a rock.

this thread is going to save me some money.. sorry to ressurect this thread, however, what a great thread it is... thanks to all who contributed!!!

thank you jet tech

Can someone tell me when does the AUX fan turn on.. I have never seen or heard my Aux fan turn on... The dealership tells me this is normal, even when i run my A/C. Is this true?

JetTech, boy did this tread make me a happy camper! I can't believe the noise I was hearing was caused by the fan vibrating! Got her all fixed up though, thanks to you! :thumbsup-big:

guess I'm late on this one because none of the pictures show up anymore.