Radiator Fan Questions

[Foggy]

2014 Yukon XL Denali
I am doing a bunch of work on my Yuk..
One of the things that concerns me is the Cooling Fan Assembly
I have read somewhere here ( having trouble doing any successful searches) about
fan blades being 5/7/9 blade with diff combos and the fan motor wattages
My fans are both 7 blade.. But it looks like they've been replaced with aftermarket assembly.
So I'm not sure what would have been the correct set up
I have my RPO codes etc.... It is the 6.2 with all the towing options

Any help or point me how to do a correct search is appreciated

 

[Foggy]

Found some info on GM Parts: 15780793 shows RIGHT 7 Blade
15780794 shows LEFT 9 Blade
With heavy duty cooling and trailer packages...
So, I'm thinkin there's been some tinkering with this SUV.
The fans have seemed to work fine, but I'm putting in a new radiator and my
Edelbrock supercharger, so I want everything to be "right" and working to it's best
capabilities.
What to do ???
8

 

[Doubeleive]

mine didn't come with the heavy duty cooling package (K5L) and had only the dual 5 blade fans but I live in California in the central valley and it gets hot here so I wanted to upgrade the fans, a new oem assembly was just stupidly priced so I bought a used 7/9 blade dual 700w assembly out of a hummer, replaced both the motors with new motors and slapped it in and it works fine. I confirmed with the dealer that the relays from a standard 500w and the 700w systems are the same so no other changes were needed, plug-n-play. The aftermarket fan assembly's out there are not dependable (in my opinion from reading lots of reviews). If you are considering doing the same and shop for a oem fan assembly BE-Careful lots of aftermarket ones are sold as oem or equivalent, some will just be offered with the same part number, you have to look at them to find a REAL oem one. used they can be found for a little over $100 such as this one 7/9 blade 700w. these will fit all 07-14 tahoe, suburban, yukon, yukon xl, escalade, avalanche. hybrid may be different, not sure.
https://www.ebay.com/itm/2009-Cadil...68a0643:g:Ya0AAOSw5T9eD80p&LH_ItemCondition=4

 

[Foggy]

How do you know the fan motor wattage???
I did find an aftermarket one on rockauto - only the TYC brand shows
it to be a true 7/9 blade set up.
They also sell a Hayden HP fan motor itself but don't list any specs on it

 

[Doubeleive]

How do you know the fan motor wattage???
I did find an aftermarket one on rockauto - only the TYC brand shows
it to be a true 7/9 blade set up.
They also sell a Hayden HP fan motor itself but don't list any specs on it

the oem 7/9 blade (rimmed) fans are 700w, the motors are bigger than the 500w motors and the shroud is thicker yet fitment is the same

 

[Foggy]

OK. Thank you for your info

 

[Foggy]

I 'see' that there is a fan assembly listed as a "replacement" for the 7/9 blade
but it really is a 7/7 blade...
SPECTRA PREMIUM CF12060 {Click Info Button for Alternate/OEM Part Numbers} Info
For 7 & 9 Blade Fan Assembly
SPECTRA PREMIUM CF12060 {Click Info Button for Alternate/OEM Part Numbers} Info
For 7 & 9 Blade Fan Assembly

So, I suppose this is what the previous owner/body shop must have put in to replace
the original damaged 7/9 blade...
I wonder if my cooling has been affected at all???? I really didn't put it to the test last summer in the heat.. My short towing was at fairly cool fall temps

 

[swathdiver]

2014 Yukon XL Denali
I am doing a bunch of work on my Yuk..
One of the things that concerns me is the Cooling Fan Assembly
I have read somewhere here ( having trouble doing any successful searches) about
fan blades being 5/7/9 blade with diff combos and the fan motor wattages
My fans are both 7 blade.. But it looks like they've been replaced with aftermarket assembly.
So I'm not sure what would have been the correct set up
I have my RPO codes etc.... It is the 6.2 with all the towing options

Any help or point me how to do a correct search is appreciated

Twin 7s would introduce weird harmonics that's why they used 7 and 9. Any part numbers on the motors?

I know for sure the 700 watt motors are 15780795 (Left) and 15780596 (Right).

Wes is a good source of info about radiators, some of them are lacking the factory restriction and cause cooling issues.

Stick with OE parts unless you know who their supplier is, there's usually none better.

 

[mikeyss]

I have both types of fans. My 09 L9H came with the 5/7 rimmed fans, which I swapped out with a truck that had the K5L RPO code dual 5 blade rimless dual 700w motors.
My 06 Sierra Denali also had the 5/7 rimmed fans, but the passenger side squeaked so I replaced them with TYC brand 7/9 rimmed fans, but I'm not sure of what wattage those motors are.

The dual 5 blade rimless 700w

And this is the TYC 7/9 rimmed

 

[swathdiver]

I have both types of fans. My 09 L9H came with the 5/7 rimmed fans, which I swapped out with a truck that had the K5L RPO code dual 5 blade rimless dual 700w motors.

Thanks for the information Mike. My previous research was evidently wrong, I thought the 5-bladed fans were 500 watts only. Updated my files!

 

[Foggy]

Twin 7s would introduce weird harmonics that's why they used 7 and 9. Any part numbers on the motors?

I know for sure the 700 watt motors are 15780795 (Left) and 15780596 (Right).

Wes is a good source of info about radiators, some of them are lacking the factory restriction and cause cooling issues.

Stick with OE parts unless you know who their supplier is, there's usually none better.

I will look later today at the fan motors closely.. I don't believe they are GM ..

 

[Foggy]

Mike, after listening to your vids... I don't think mine were ever that loud..
Although I don't know if they ever went into the HI speed.
I don't have any weird vibrations or harmonics at all. When I spin them
by hand, they seem ok too

 

[mikeyss]

The first design was 2005-2011with rimmed blades had all sorts of different options it seems. The second mid 2011-2014 designlllwith non rimmed blades only came 2 ways... Dual 500w or dual 700w which was K5L. Not sure if the second design shrouds are different between 500w or 700w, they do have different part numbers though.

 

[BG1988]

Found some info on GM Parts: 15780793 shows RIGHT 7 Blade
15780794 shows LEFT 9 Blade
With heavy duty cooling and trailer packages...
So, I'm thinkin there's been some tinkering with this SUV.
The fans have seemed to work fine, but I'm putting in a new radiator and my
Edelbrock supercharger, so I want everything to be "right" and working to it's best
capabilities.
What to do ???
8

buy the best one you can afford

 

[Doubeleive]

The first design was 2005-2011with rimmed blades had all sorts of different options it seems. The second mid 2011-2014 designlllwith non rimmed blades only came 2 ways... Dual 500w or dual 700w which was K5L. Not sure if the second design shrouds are different between 500w or 700w, they do have different part numbers though.

the shrouds would have to be different the motors are bigger and configured different than the 500w, I had the dual 5 blade 500w in my yukon, when I bought the 700w motors I checked to see if I could just swap stuff, none of it fits in the shroud at all.

 

[cycho]

Does the 7/9 700 watts make a big difference? I am experiencing high coolant & trans temps while towing with the stock 5/7. Have a new external transmission cooler to install. Thinks of doing the fan upgrade at the same time.

 

[swathdiver]

Does the 7/9 700 watts make a big difference? I am experiencing high coolant & trans temps while towing with the stock 5/7. Have a new external transmission cooler to install. Thinks of doing the fan upgrade at the same time.

Sure does! Sure you don't have them already? What are your "K" RPO codes?

 

[cycho]

Sure does! Sure you don't have them already? What are your "K" RPO codes?

I counted the blades, seven on the driver side, 5 on the passenger side.

 

[cycho]

Sure does! Sure you don't have them already? What are your "K" RPO codes?

How about a Dorman 620-654?

 

[swathdiver]

How about a Dorman 620-654?

Well, their application guide says it will work. I'm just not a fan of most Dorman parts. I prefer GM Original Equipment whenever possible or AC Delco Professional. Sometimes we get lucky and can buy from the OE supplier to save a few bucks.

Reviews on Amazon are mostly positive, especially from people replacing the originals and they commented a year later so that is good to know. Some complaints from years ago about poor motor quality which translated to excessive amperage draw and burned up wiring and relays.

I don't think my 700 watt fans use 30 amps each as the battery is only rated for a 70 amp draw. But then again, 700 watts at 12.6 volts is over 55 amps each! I know enough about electricity to start fires and that's about it! Maybe someone with electrical wisdom will chime in.