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Username Post: Fan clutch        (Topic#343839)
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2155
rockfangd
Age: 31
Loc: Utica ny
Reg: 04-13-10
04-06-17 08:10 PM - Post#2685340    

Hi all.
So last year I noticed my coolant temp was a little higher than normal when pulling hills on warm days. This on my 1990 5.7l k1500
It was also slow to warm up.
So I decided to replace the fan clutch, and while I was doing that I decided to replace the fan.
I went from the 7 blade steel fan to the 11 blade composite blade.
I now know that my fan clutch was not working, probably for quite some time. I dont ever recall hearing it while driving.
Now with the new clutch and blade I know it is working. It works nicely to warm the engine and it now stays perfectly around 190*.
Also with the 11 blade fan it wont need to run much to work efficiently which should help fuel economy and HP.
The fan blade was a bolt on swap that fits nicely.
Just thought I would share.
I also give credit to the GMT400 forum for the insite
https://www.rockauto.com/catalog/images/transp urpl...

Attachment: 20170326_142605_1491533289586.jpg (65.13 KB) 14 View(s)




Attachment: 20170326_145242_1491533289062.jpg (56.63 KB) 9 View(s)




Old School GM fan FOREVER


Edited by rockfangd on 04-06-17 08:11 PM. Reason for edit: No reason given.

 
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scrambldcj8 
Senior Member
Posts: 2274

Loc: MA
Reg: 04-06-03
04-07-17 04:11 AM - Post#2685359    
    In response to rockfangd

Is that the H1 11 blade fan? Duramax fan...same?
Can you provide part numbers?



 
454cid 
Frequent Contributor
Posts: 2391
454cid
Age: 44
Loc: West Michigan
Reg: 02-18-12
04-07-17 11:00 AM - Post#2685416    
    In response to scrambldcj8

  • scrambldcj8 Said:
Is that the H1 11 blade fan? Duramax fan...same?
Can you provide part numbers?



I researched this a little awhile back. There are several blades that people use. A lot of them use a blade that came on a 4.3L V6, and some use a Duramax blade, which I think is an inch larger. I ended up just keeping my 9 blade steel/aluminum fan.


99 K3500 RCLB


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2155
rockfangd
Age: 31
Loc: Utica ny
Reg: 04-13-10
04-07-17 06:21 PM - Post#2685492    
    In response to 454cid

I did post a link to the one I used.
Bottom line of the first post

Old School GM fan FOREVER


 
454cid 
Frequent Contributor
Posts: 2391
454cid
Age: 44
Loc: West Michigan
Reg: 02-18-12
04-07-17 10:22 PM - Post#2685536    
    In response to rockfangd

  • rockfangd Said:
I did post a link to the one I used.
Bottom line of the first post



I tried following that link, and I get a square in the the middle of my screen, that's it.

I assume you bought the Dorman replacement for the 4.3L...... I think they used them on some 350's too.


99 K3500 RCLB


 
bowtie44s 
Valued Contributor
Posts: 3695
bowtie44s
Age: 34
Loc: wv
Reg: 08-29-12
04-08-17 06:35 AM - Post#2685570    
    In response to rockfangd

I put one on mine. I had the steel 4 blade fan on mine. I got my fan from a 96 S10 Blazer for $5. The Blazer had a different clutch but my clutch bolted right on.

Jeff

'88 Chevy K3500, aluminum head roller cam 511inĀ³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2155
rockfangd
Age: 31
Loc: Utica ny
Reg: 04-13-10
04-08-17 10:49 AM - Post#2685598    
    In response to bowtie44s

sorry. I dont usually use dorman.
FOUR SEASONS 36893

Old School GM fan FOREVER


 
scrambldcj8 
Senior Member
Posts: 2274

Loc: MA
Reg: 04-06-03
04-08-17 06:31 PM - Post#2685657    
    In response to rockfangd

  • rockfangd Said:
sorry. I dont usually use dorman.
FOUR SEASONS 36893



Thanks.

.....Yeah, all I got with the link was a (blue?) square on the upper left of the page...



 
CowboyTrukr 
"6th Year" Silver Supporting Member
Posts: 3703
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
04-08-17 09:48 PM - Post#2685671    
    In response to scrambldcj8

http://www.rockauto.com/en/moreinfo.php?pk=2195760...

For those wanting a link, here you go


Greg

'95 K1500 Z71 EC Short Step 5.8L/NV3500
'00 Explorer XLT 4.0 V6 Auto
'00 Contour SE 2.5 24V
'94 K2500 5.7 NV4500 ECLB - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
454cid 
Frequent Contributor
Posts: 2391
454cid
Age: 44
Loc: West Michigan
Reg: 02-18-12
04-08-17 11:34 PM - Post#2685677    
    In response to rockfangd

  • rockfangd Said:
sorry. I dont usually use dorman.
FOUR SEASONS 36893



Yes, I too avoid Dorman. Sometimes that's all that's available besides OEM, Though. My wiper transmission, and interior door handle from Dorman seem to be okay.

That fan you bought wasn't too bad in price. My OEM fan, even on ebay is really expensive....approaching $200, if I recall correctly. It's a nine blade steel an aluminum fan. There are two things that bother me a bit about it..... it doesn't spin quite straight even with a new clutch, and it's kinda heavy. Your new plastic fan is obviously lighter, but does it seem to spin true? If I were to get one, I think I'd paint it black with one of those new paints that's supposed to stick to plastic.

99 K3500 RCLB


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2155
rockfangd
Age: 31
Loc: Utica ny
Reg: 04-13-10
04-09-17 01:53 PM - Post#2685743    
    In response to 454cid

It is twice as light and spins perfectly.
They are weight balanced when they are built to ensure they wont vibrate.
Very affordable also

Old School GM fan FOREVER


Edited by rockfangd on 04-09-17 01:54 PM. Reason for edit: No reason given.

 
454cid 
Frequent Contributor
Posts: 2391
454cid
Age: 44
Loc: West Michigan
Reg: 02-18-12
04-09-17 06:05 PM - Post#2685776    
    In response to rockfangd

  • rockfangd Said:
It is twice as light and spins perfectly.
They are weight balanced when they are built to ensure they wont vibrate.
Very affordable also



What was the country of origin?

99 K3500 RCLB


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2155
rockfangd
Age: 31
Loc: Utica ny
Reg: 04-13-10
04-09-17 07:23 PM - Post#2685785    
    In response to 454cid

I am pretty certain it was USA.
That is why I went with 4 seasons.
Good brand with a good warranty

Old School GM fan FOREVER


 
454cid 
Frequent Contributor
Posts: 2391
454cid
Age: 44
Loc: West Michigan
Reg: 02-18-12
04-09-17 10:44 PM - Post#2685812    
    In response to rockfangd

  • rockfangd Said:
I am pretty certain it was USA.
That is why I went with 4 seasons.
Good brand with a good warranty



Thanks.... maybe I'll change mine yet. Power Steering hoses and brakes come first though. I noticed a leak and grinding someplace today.


99 K3500 RCLB


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2155
rockfangd
Age: 31
Loc: Utica ny
Reg: 04-13-10
04-10-17 06:44 PM - Post#2685942    
    In response to 454cid

I love it so far. It holds the temp beautiful.
I have heard it works wonders for AC also. Blows colder at idle.
Mine is 55/3 so I cant judge that one

Old School GM fan FOREVER


 
Vaughn 
"15th Year" Gold Supporting Member
Posts: 18770
Vaughn
Loc: Colorado Springs, CO
Reg: 08-08-04
04-20-17 03:43 PM - Post#2687505    
    In response to rockfangd

I had a composite fan lying around, so I decided to throw it on the 97 this afternoon.

Some things to think about:
The edges of the composite fan blades are very sharp, they will cut your fingers very easily even if they are a few years old. You might want to debur the edges or wear gloves to install.

Chevy engines operate in a clockwise rotation as you are looking at the vehicle from the front of the radiator, so the large nut on the fan unscrews in a CCW manner. You will want to use a long/large screwdriver stuck between two of the 10 mm bolts holding the fan pulley on and a large crescent wrench to undo the large nut, because the tension on the fan belt will not be enough to allow you to loosen the nut. For those unfamiliar with the water pumps that have the large threaded snout that the fan screws on, you cannot take the fan and pulley off by removing the (4) 10 mm bolts.

Lay the fan and thermostatic clutch down on the floor, then unbolt the clutch from the fan, (4) 13 mm bolts. Take the fan off of the clutch, being careful to keep the orientation in the same direction and set it on the floor. This will tell you how to install the new fan blades onto the clutch so that you are sucking air through the radiator rather than pushing it back through, which would be bad.

DO NOT assemble the fan and clutch at the same time. It will not fit into the shroud assembled. Stick the fan into the shroud remembering to orient it the same way that the metal fan is oriented. Then maneuver the clutch into the shroud and in front of the fan. Then you can assemble the clutch and the fan together.

Before you install the clutch and fan assembly, put some anti-seize on the threaded stub of the water pump, so it isn't as hard to remove the fan assembly next time.

Then thread the fan assembly onto the water pump stub, and tighten it down with the crescent wrench. Use the screwdriver stuck between two of the 10mm bolts to help tighten the nut. Don't go overboard tightening the nut, the fact that the engine rotates clockwise will help to tighten it as the engine rotates.



 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2155
rockfangd
Age: 31
Loc: Utica ny
Reg: 04-13-10
04-20-17 06:26 PM - Post#2687528    
    In response to Vaughn

My engine is a CCW rotation. Pretty sure anyway.
Also has 4 bolts that secure the clutch and waterpump pulley to the waterpump.
I took the top portion off of my shroud so I could put the assembled unit in all together

Old School GM fan FOREVER


 
454cid 
Frequent Contributor
Posts: 2391
454cid
Age: 44
Loc: West Michigan
Reg: 02-18-12
04-20-17 07:48 PM - Post#2687537    
    In response to Vaughn

I used a ratchet to put more tension on the belt with the belt tensioner when the belt alone wasn't enough to keep the pump from spinning. I have the traditional 4 bolt setup, not the big single nut, Though.

99 K3500 RCLB


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2155
rockfangd
Age: 31
Loc: Utica ny
Reg: 04-13-10
04-20-17 07:58 PM - Post#2687540    
    In response to 454cid

If you know how to position the wrench it will work on your side and make it easier.
Difficult to explain how it works though

Old School GM fan FOREVER


 
1983G20Van 
Super Senior Member
Posts: 3628

Loc: Bedford, Texas, USA
Reg: 11-13-02
04-21-17 09:28 AM - Post#2687596    
    In response to rockfangd

  • rockfangd Said:
Hi all.
So last year I noticed my coolant temp was a little higher than normal when pulling hills on warm days. This on my 1990 5.7l k1500
It was also slow to warm up.
So I decided to replace the fan clutch, and while I was doing that I decided to replace the fan.
I went from the 7 blade steel fan to the 11 blade composite blade.
I now know that my fan clutch was not working, probably for quite some time. I dont ever recall hearing it while driving.
Now with the new clutch and blade I know it is working. It works nicely to warm the engine and it now stays perfectly around 190*.
Also with the 11 blade fan it wont need to run much to work efficiently which should help fuel economy and HP.
The fan blade was a bolt on swap that fits nicely.
Just thought I would share.
I also give credit to the GMT400 forum for the insite
https://www.rockauto.com/catalog/images/transp urpl...



I pulled the 5 blade steel fan off my Express years ago and ran one of those for a couple of years. Then pulled it off for a GMT400 Tahoe tow package fan. Removed that for Impala electric fans. Removed that for Police Tahoe fans. The electrics could not keep the 350 cool even with a 454 radiator with a heavy trailer. Pulled the electrics and put a Duramax fan on it. The engine runs cooler with the Duramax fan than it ever has even though I put a 25% underdrive pulley setup on it. When the clutch actually engages on the Duramax fan the roar it makes has you looking for a medium duty truck.


1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 04-21-17 09:29 AM. Reason for edit: No reason given.

 
454cid 
Frequent Contributor
Posts: 2391
454cid
Age: 44
Loc: West Michigan
Reg: 02-18-12
04-21-17 11:05 AM - Post#2687606    
    In response to rockfangd

  • rockfangd Said:
If you know how to position the wrench it will work on your side and make it easier.
Difficult to explain how it works though



Are you talking to me? If so I have no idea what you mean by "it will work on your side".


99 K3500 RCLB


 
Vaughn 
"15th Year" Gold Supporting Member
Posts: 18770
Vaughn
Loc: Colorado Springs, CO
Reg: 08-08-04
04-21-17 01:18 PM - Post#2687617    
    In response to 454cid

Replace the words "it will work on your side" with the words "it will work in your favor".



 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2155
rockfangd
Age: 31
Loc: Utica ny
Reg: 04-13-10
04-21-17 06:07 PM - Post#2687675    
    In response to Vaughn

Yes. Sorry. We all have different lingo lol.
It has to do with physics.


Old School GM fan FOREVER


 
454cid 
Frequent Contributor
Posts: 2391
454cid
Age: 44
Loc: West Michigan
Reg: 02-18-12
04-22-17 07:20 AM - Post#2687711    
    In response to rockfangd

  • rockfangd Said:
Yes. Sorry. We all have different lingo lol.
It has to do with physics.




I still have no idea what you're talking about.

99 K3500 RCLB


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2155
rockfangd
Age: 31
Loc: Utica ny
Reg: 04-13-10
04-22-17 11:35 AM - Post#2687746    
    In response to 454cid

It is hard to explain.
If you want to remove a fastener on a part that spins the best way to do it is to put the tool past the center of the part, that will give you leverage to help to loosen or tighten the fastener

Old School GM fan FOREVER


 
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