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Unread 10-03-2013, 08:12 PM   #541
noise_maker
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Having a hard time trying to find a 10 blade fan. Has anyone tried the 12 blade Droman 620-149? - comes up for a 95-96 explorer at allot of places

Tried it with the 9 blade with the hayden clutch. It is no better then the stock fan. 15 mins idle in 75 degree weather with AC on and it will be just about to the red

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Unread 03-24-2014, 01:06 AM   #542
4x4ham
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Quote:
Originally Posted by Knuckelhead View Post
OEM TSB 7 blade fan - 55037650AA
OEM TSB Fan clutch 05066177AA

Those work, to bad you cant get them anymore...

Actually, I just bought the 7 blade fan today from here...

http://www.moparpartsamerica.com/par...OLING%20SYSTEM

Brand new OEM parts. A bit pricey but willing to pay for that. Not happy at all with the 6 bladed fan from Flex. Too noisy. The blade pitch is just right on the 7 blade fan since it matches the original TSB fan part exactly so I'm expecting the same results. The TSB warns of increased fan noise so we'll see how much compared to the old 5 blade.

It's seems to me that the Explorer's fan placement on the Explorer hasn't been measured either. Those having issues with that fan might measure the distance from the rad to the fan as installed on the Explorer and take note of the position of the fan within the shroud before assuming too much on the Jeeps. As Chris and a couple of others have found, the set of the fan relative to the shroud is important to create the "venturi effect". Too far in the fan cavitates with the air between the rad and the fan. Too far out and it cavitates with air being drawn from the edges of the fan around the shroud's perimeter. The fan also needs to be the correct diameter to the shroud's opening, blade pitch and fan speed. Lots of variables to consider that you can't just throw parts at and expect positive results.

That being said, my plan is to test the new 7 blade fan with the stock clutch, which appears to be heavy duty according to my build sheet's information about the cooling system (2 core aluminum rad with plastic tanks) to see if that's what the TSB really did. It seems they replaced the clutch anyway but since there's no Severe Duty version of the clutch listed for Jeep, I suspect the clutch was replaced as a warranted exchange to ensure the clutch would not fail after the TSB was applied.

If this does not offer the results expected as Jeep intended then I'll install the Severe Duty clutch with the 7 blade fan and test that. Hopefully all my parts will be at home while I keep on truckin' to get home for a week. I'll try to post an update.

Happy Jeepin!

Smitty
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Unread 03-24-2014, 02:58 AM   #543
chmo
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And where exactly does it say it is the 7 blade fan?
(except visually in the schematic drawng)

woul be too cool to be true

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Unread 03-24-2014, 07:55 AM   #544
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Quote:
Originally Posted by chmo View Post
And where exactly does it say it is the 7 blade fan?
(except visually in the schematic drawng)

woul be too cool to be true
x2. how do you know it's the 7-blade & accompanying clutch? no PN is listed, and pictures are generic...
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Unread 03-25-2014, 09:57 AM   #545
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Okay. Yes, it does not say 7 blade fan and yes, there isn't a p/n. But most people assume there aren't any anywhere, I'll go based on the pic and hope a dealer somewhere has new old stock. When I worked for a Chysler dealer in the 80's I saw all kinds of parts search requests for the "older stuff". Located a front fender myself for a '72 Dart I was fixing up at the time.

So I will find out if this is a seven blade fan or simply a five blade fan. I can either return it on the basis that the part shown isn't the part wanted or use it to replace my damaged 5 blade. Either way I'm willing to take a little risk. I really don't want thesix blade as it does make a lot of noise. More than should be acceptable IMO.
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Unread 03-25-2014, 10:05 AM   #546
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Quote:
Originally Posted by 4x4ham View Post
Okay. Yes, it does not say 7 blade fan and yes, there isn't a p/n. But most people assume there aren't any anywhere, I'll go based on the pic and hope a dealer somewhere has new old stock. When I worked for a Chysler dealer in the 80's I saw all kinds of parts search requests for the "older stuff". Located a front fender myself for a '72 Dart I was fixing up at the time.

So I will find out if this is a seven blade fan or simply a five blade fan. I can either return it on the basis that the part shown isn't the part wanted or use it to replace my damaged 5 blade. Either way I'm willing to take a little risk. I really don't want thesix blade as it does make a lot of noise. More than should be acceptable IMO.
Good luck. I've got a friend that works parts at a dealer and he can tap into the national database for all the parts. The last time I had him look for them, not only were there not any in the system, they were obsoleted out. Don't forget that when the financial crisis hit all the automakers, most of them restructured stuff to lower their overhead. One of the things Chrysler did was turn a lot of their inventory over to Vintage Parts and they handle all the stuff starting back a few years. I had to order a transmission NSS adapter plug and section of harness for an 02 through them via the dealer.
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Unread 03-25-2014, 08:41 PM   #547
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When I got my 7 blade fan and matching TSB fan clutch back in 05 or 06, they could only find one fan and it had to come from Phoenix AZ.


IIRC the fan was less than $30, I should have bought more of them...
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Unread 03-26-2014, 10:12 PM   #548
4x4ham
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Finally got word the fan is on its way. It's the 5 blade. Called them and asked why the pic doesn't match as I was expecting to get a 7. The said they are not responsible for the errors. Typical answer. No big deal really. I have a new fan coming and will be able to check out the performance of this combination through the summer but will take my 6 blade fan jet with me just in case. In the mean time, I'll replace the cam timing chain set since it will be easily accessible without the rad and w-pump.

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Unread 03-27-2014, 04:13 AM   #549
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I didn't make it all the way through the thread but I didn't notice anyone mentioning if they had hood vents. The hood vents couples with the new fan and clutch may cause turbulence it it may increase air flow. Curious to know.

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Unread 03-27-2014, 05:43 AM   #550
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Unread 03-27-2014, 09:19 AM   #551
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Quote:
Originally Posted by MrSundays View Post
I didn't make it all the way through the thread but I didn't notice anyone mentioning if they had hood vents. The hood vents couples with the new fan and clutch may cause turbulence it it may increase air flow. Curious to know.

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I have hood vents with the 7 blade fan and HD clutch. I've never experienced any turbulence with that combo. Lots of hot air comes out of those vents. They really work to keep the hood cooler and the hoses under the hood cooler.
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Unread 03-27-2014, 10:12 AM   #552
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Originally Posted by Border Dave View Post
I've never experienced any turbulence with that combo.
Generally speaking, turbulence is a bad thing when we're talking about fluids (air is a fluid). You normally want laminar flow, not turbulent flow.

But that's a whole different discussion entirely....
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Unread 03-30-2014, 08:14 AM   #553
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keeping TJ cool on the trail with extra fan

Just wanted to ask if any of those who went back to the stock fan clutch have tried adding a fan on the front? Any issues with removing the rad brace to make room for a front-mounted fan?

http://www.jeepforum.com/forum/f9/ho...iator-1242318/
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Unread 03-30-2014, 10:21 AM   #554
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Would it work to run engine coolant through an auxiliary oil cooler? Maybe a Derale 20561 on the rearward frame, as a way of applying a second fan to the coolant? Or would the differently sized connectors or passageways mess up the coolant flow?
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Unread 03-31-2014, 05:16 PM   #555
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Hi All! Latest findings when tearing down the front of the engine was a severely rusted water pump bolt. Found a replacement in a junk box I knew not to have thrown out. Pulled the harmonic balancer off and discovered the second leak of the day. The sealing surface is grooved pretty badly so the seal is shot as well. Timing chain deflects pretty bad too. Now I'm wondering if I should drop the pan and inspect the bearings even though oil pressure is good through the whole RPM range. Ugh. And to think this was just going to be a cooling system repair/upgrade. At least all parts are present and accounted for.
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10 blade , 5 blade , 9 blade , cooling , explorer , fan blade , Fan clutch , ford , upgrade

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