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dbbaker
Dodge Dakota
12/06/2001
19:44:48
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 Subject: fan noise on take off
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Message:
I have a 2000 dakota 4x4 sport 4.7 v-8, when you first start it up and drive away it makes a very loud fan noise, [ I THINK ]. THE SERVICE GUY TOLD ME THIS IS NORMAL, would like to hear other oppinions or fixes if anybody knows any, thanks.
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CW
GenIII
12/06/2001
20:13:46
|  RE: fan noise on take off
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Message:
Yes unfortunately this is normal. My new truck is the first one I have seen that doesn't do it.
2001 4.7 5sp 3.92 LSD sport plus
Ported throttle body, IAT adjuster, flowmaster cat back, adjusted TPS from .51v to .76v
Working on custom 4" cold air intake
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97dak
Dodge Dakota
12/07/2001
12:41:27
|  RE: fan noise on take off
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Mine also makes the noise. Usually does it when the outside temp is below 45 degrees. Only seems to do it for about 30 seconds, then stops.
97dak
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Glynn
Dodge Dakota
12/07/2001
14:09:48
| RE: fan noise on take off
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Message:
Yes, my truck does the same thing 2001 4.7QC and from a post I did about 2mnths ago its sounds like its the fan clutch.
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kicker01
Dodge Dakota
12/08/2001
13:18:23
| RE: fan noise on take off
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Message:
dont stress it, mine does it too, its normal
'01 RC 4.7 5spd
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bk dak
Dodge Dakota
12/08/2001
14:41:18
| RE: fan noise on take off
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Message:
I do not know what it is, but on many SUV's and trucks I have heard the noise. Like you said it only does it when it is started and is normal.
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Lesley
GenIII
12/08/2001
15:08:07
| RE: fan noise on take off
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Message:
Mine too, it roars.
97 3.9 V6 Sport Club Cab. Black. Auto 3.55
Quick D Intake, JBA Stainless headers
Autolite 3923s with Borg Warner Wires
Awaiting Installation: Borla catback, V8 R/T TB
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D Denney
Dodge Dakota
JOIN HERE
3/13/2002
10:06:09
| RE: fan noise on take off
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Message:
my 00 quadcab 4.7 does this also,sounds like the Brown truck when it does it.
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GstRdr1
Dodge Dakota
JOIN HERE
3/13/2002
10:29:47
| RE: fan noise on take off
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I guess I'm one of the lucky ones. Like CW mine doesn't do that.
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rlloyd
Dodge Dakota
JOIN HERE
3/13/2002
11:20:50
| RE: fan noise on take off
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I got all paranoid when my did it. I found out this is normal, but it has only happened to me, 3 times. Sound goes away in less than a minute. I believe it has something to do with the fan clutch being engaged (or dis-engaged, I'm not sure which) and not allowing the fan to freewheel. After a few seconds, the fan releases and then freewheels. Something like that?!? No worries, though.
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LS1MoparTurbo
Dodge Dakota
JOIN HERE
3/13/2002
15:43:50
| RE: fan noise on take off
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Message:
Hey,
Most Vehicles with a fan clutch that works off of heat, in other words the aluminum thing on the fan with fins. Most are fluid filled, when it heats up the clutch allows the fan to spin with force otherwise, it free wheels. In the morning at times and on take of the clutch is disengaged and the fan will spin so it will sound loud. My S-10 has done it for the last 170,000 miles. If it is loud all the time that means the fan clutch is bad and a new one is about 60 bucks.
Hope this helps
Mike Friend
2001 z-28
1991 S-10
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Todd W
Dodge Dakota
JOIN HERE
3/13/2002
18:05:46
| RE: fan noise on take off
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If you don't like the fan 'roar', you can either geta Flex-Fan (elimnate the clutch and gain some HP! Flex fans work by the blades actually changing pitch at higher RPM to 'grab' less air. Although I've heard stories where blades have ripped off and shot through the hood, doesn't seem to be too common though with proper mounting) or you can go electric. Of the two, a flex is probally easier to hook up and cheaper.
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Hersbird
Dodge Dakota
JOIN HERE
3/13/2002
18:17:57
| RE: fan noise on take off
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The clutch fan only roars when it locked, engaged. It normally slips but when its cold out, or when you idle in one place for a while it will engage. Spinning the motor up will heat up the clutch pack when it's cold and release it, or when you've been sitting a long time just get moving or rev it up and it should free up. If you never hear the roar I'd wonder if its working at all, that seems just as bad as always hearing it. Seeing as how the clutch fan is hardly even needed on the 2000 up Dakotas I guess it doesn't really matter if it never engages. I saw some tests in old Mopar Muscle mags where they said a clutch fan retrofitted onto a older musclecar with a normal metal fan will help a bunch. They said the flex fan is good as well, but in the higher RPM range it starts robbing more power then the clutch fan, and the clutch fan is better at letting the motor spin up ahead of it, as it just slips, and catches up later. Of course this was all before electric fans, and flex fans may have also improved over the last 20 years, but so may have the clutch fans.
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Todd W
Dodge Dakota
JOIN HERE
3/13/2002
18:27:11
| RE: fan noise on take off
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Your right of course. But if I remember correctly the Flex fan doesn't start to negativly effect the powerband until you get about or around 5000 RPM. The clutch fan on the other hand, is heavy and effects the power band lower in the RPM range. It all depends on where your looking to make your gains, really. Since the optimal RPM range on my truck is between 2500 and 4000 RPM, a flex fan would benifit me more than a clutch. It's all personal preferance. :0)
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D
Dodge Dakota
JOIN HERE
3/13/2002
19:55:19
| RE: fan noise on take off
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Message:
just take it off (clutch fan, that is) works fine
without it, as long as you have an elec fan and
clutch fan setup. so far has worked in some
pretty warm so cal weather. make sure you
change the Tstat to 180.
D
01/4.7/CC/airaid+3"homebrewed/180stat/Jet2
DynomaxRaceWeldedMuffler+3"catback/TB
spacer/ported-polished 68mmTB/No Clutch
Fan/DJMdrop3-6
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Hersbird
Dodge Dakota
JOIN HERE
3/13/2002
23:16:14
| RE: fan noise on take off
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My brother about cut his thumb off on one of those flex fans and it was when the motor was stopped! I just get bad memories of them everytime I see them. They are a good bang for the buck kind of thing and look betterthen a big old clutch fan. I paln on dropping my clutch fan this summer, and see how it behaves. Then maybe I'll add a extra electric fan if it seems to heat up at a stop. Luckily the longest lights and biggest traffic jambs around here (Montana) nothing to worry about!
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dbbaker
Dodge Dakota
JOIN HERE
3/14/2002
19:15:46
| RE: fan noise on take off
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Message:
Thanks for all the imput guys, but I just got tired of hearing it so I had flowmaster 40 series with duals from muffler back/ now I don't even notice it anymore L.O.L.
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Todd W
Dodge Dakota
JOIN HERE
3/14/2002
20:20:31
| RE: fan noise on take off
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Message:
Yeah, that -would- do it... LOL
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Lesley
GenIII
3/14/2002
23:31:17
| RE: fan noise on take off
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Message:
Yup, that and turning the stereo up help a lot.
97 3.9 CC Sport. Black. Auto 3.55
Quick D Intake, JBA Stainless headers, Autolite 3923s, stainless Borla Turbo XL, V8 R/T TB,
19 lb.FMS fuel injectors. Coming 17" Boyd Coddington Smoothies
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R. White
Dodge Dakota
JOIN HERE
12/05/2002
18:15:05
|  RE: fan noise on take off
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I noticed the amount of Dak owners with fan clutch noise on a cold engine. Anyone out there have the same problems with the A\C on? My '97 Dak fan clutch only kicks in whith the A\C on, and it doesn't want to shift from 1st to 2nd. Dealer said this is typical and to live with it.
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paysonbadboy
Dodge Dakota
JOIN HERE
12/05/2002
22:22:57
| RE: fan noise on take off
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Go ELECTRIC.
One time I changed a fan on my friends car to one that didn't "grab" as much when you hit the gas.
It made so much difference that he could burn the tires on takeoff when it coudn't before!
But the electric fan is the best choice. It also makes soo much more room in front of the engine too!
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buddy
Dodge Dakota
JOIN HERE
12/05/2002
22:25:59
| RE: fan noise on take off
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Message:
Mine ROARS too, but only on occasion when it's cold out. Fan clutch. Normal, but stupid design.
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FredDQC
Dodge Dakota
JOIN HERE
12/06/2002
11:08:10
| RE: fan noise on take off
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Message:
D is right!
Just take it off if you have the electric fan setup. The electric fan is designed to turn on at 210F(on mine at least) and will bring the temp down to 180(if you have a 180F thermostat);and when the A/C in ON, the electric fan is also constantly ON (that answers R.White question partially). If you worry about the weather, I live in the lowest south of Texas where temps normally are above 100F. On the other hand, if you want for your truck to be constantly running at 180F(in my case) then don't take it off and live with the noise.
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Dally
Dodge Dakota
JOIN HERE
12/06/2002
13:55:13
| RE: fan noise on take off
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Message:
This particular issue is discussed in your owners manual as a good thing (reading is also a good thing)It indicates that your automatic tranny is up to temp before it will shift out of 1st gear. notice that as soon as the shift takes place, the noise stops. READ GUYS.
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R.White
Dodge Dakota
JOIN HERE
12/06/2002
14:58:11
| RE: fan noise on take off
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Message:
Thanks for the responses gentlemen..per Dally's response..this occurs only when the engine is hot and A\C is on..never happens in winter. Seems like the electric fan may be the answer. Is this a dealer fix or local shop.
thanks
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dbbaker
GenIII
12/06/2002
15:52:28
| RE: fan noise on take off
IP: Logged
Message:
All I know is when ya got a sweet looking dak and ya start it up and go to pull away, and its making that stupid loud fan noise it makes you feel like anybody around a half block area can hear that stupid fan noise..
shaker hood/w k&n-magnaflow duals-ss grille-westin safari bar and nerf bars-
mtx thunderforms-are lid-z-liner sprayed in bed
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chris
Dodge Dakota
JOIN HERE
5/02/2003
14:34:59
| RE: fan noise on take off
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Message:
Mine made a knocking noise when taking off. It was the fan clutch.
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chris
Dodge Dakota
JOIN HERE
5/02/2003
14:35:51
| RE: fan noise on take off
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Message:
Replace ur fanclutch. Its not supposed to do that.Mine went out after the car was 6 years old.
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don
Dodge Dakota
JOIN HERE
5/02/2003
15:52:30
| RE: fan noise on take off
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Funny isn't it that Dodge has lots of "normal" things that are not in other trucks. Yea my 03 does it too in the morning. Usually quits within a minute. I have an 02 Tahoe and it is really quiet compared to this piece of crap. If it was not a company truck, I would not have bought it.
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Scott P.
Dodge Dakota
JOIN HERE
5/09/2003
21:24:40
| RE: fan noise on take off
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Message:
My '03 Dak starts off sounding like a school bus too, even when the crack-of-dawn temp is 75° (not unusual in southern Louisiana, even in spring.) And my '91 Dak's fan always paddled air first time I took off in it, so I think it has something to do with the viscous coupling getting stiff when not moving, regardless of temperature. Now in my '91 Dak, I can actually feel the loss of HP when the radiator heats up enough to engage the fan clutch as I'm driving down the interstate. It's just now getting smokin' hot enough to make the engine driven fan in my '03 come on as well as the electric fan.
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Chad L
Dodge Dakota
JOIN HERE
5/09/2003
21:57:22
| RE: fan noise on take off
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I have an '03 Quad Cab 4.7L and it has the howl, usually when it is around 45 degrees or so. Goes away after around 30 seconds. I was alarmed at first too...
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