K5L Fans on GMT800

[redhat9]

Curious on swapping out 7/9 or 5/5 2nd design 700w K5L fans on my Tahoe. Presently it is a 2005 with factory 300k+ eFans and a 160amp alternator.

I see a lot of posts about them being swapped on GMT900s, but not a lot on the 800s. Looking up, it looks as if when equipped with K5L, you'd have a 160amp alternator.

Does anyone know if the GMT800 when equipped with efans, and a 160amp alternator will be OK for these stronger fans? Or when performing this upgrade is anyone upgrading wiring/fuses/relays/etc?

Thanks.

 

[mattbta]

I have gone through a number of iterations with e-fan conversion on my 2004. They ALL suck a lot of power when the blower is on high in the heat of a Texas summer. I'm not wholly comfortable with the dips despite upgrading to a Mechman 240a (i had 145a from factory) and doing a big 4. You might be better off since you've got the RVC setup - my 04 doesn't. I think my idle is too low to get enough generation going with all the drag. Or I have another issue going on. Or the motors need replacing.

I've done regular OEM 5/7, K5L 7/9, and K5L 5/5 new design. Settled on K5L 7/9. They all fit fine.

 

[redhat9]

Thank you @mattbta Appreciate the info. I think I am going to try some 7/9 and new motors. From my looking it doesn't seem like the E-Fan'd 160amp 800 is much different from a 900 in terms of fan harness or wiring.

Thank you again. I will report back.

 

[mattbta]

Thank you @mattbta Appreciate the info. I think I am going to try some 7/9 and new motors. From my looking it doesn't seem like the E-Fan'd 160amp 800 is much different from a 900 in terms of fan harness or wiring.

Thank you again. I will report back.

i used an oem harness and haven't had any relay melting issues like the aftermarket.

 

[redhat9]

You are awesome, exactly what I was curious on. Thank you!

 

[mikeyss]

When I had my 05 Tahoe, I swapped to the K5L 2nd design 5/5 700w fans and they fit the same has the 1st design and worked very well. I now have them in my 09 Tahoe cooling my 3 core radiator, but they are a bit noisy when on high compared to the 1st design ones. You can't go wrong with either style K5L fans, and your 160amp alternator will be ok.

 

[Doubeleive]

should be a direct swap from gmt900 to gmt800 or vica-versa, no different relay or anything is needed regardless of "wattage"

 

[redhat9]

Thank you all... gives me confidence with this. They are definitely easy to swap out, but the wiring/relays/harness was what I was curious on -- so thank you.

Called up a local wrecking yard that 3x over guaranteed they had a 7/9 fan assembly and pulled it for me. Drive 30 minutes to pick it up to find it was a 5/7 like I already have. So I've been looking up vehicles in two local/semi-local U Pull It Yards and plugging their VINs into a GM SI decoder and have found some with K5L.

Looks like tomorrow AM I will visit some yards in hopes that fan assemblies haven't been robbed and or mangled in a front end impact. Already have new 700w motors coming tomorrow.

 

[Marky Dissod]

... plugging their VINs into a GM SI decoder and have found some with K5L.

SI decoder?

 

[Doubeleive]

Thank you all... gives me confidence with this. They are definitely easy to swap out, but the wiring/relays/harness was what I was curious on -- so thank you.

Called up a local wrecking yard that 3x over guaranteed they had a 7/9 fan assembly and pulled it for me. Drive 30 minutes to pick it up to find it was a 5/7 like I already have. So I've been looking up vehicles in two local/semi-local U Pull It Yards and plugging their VINs into a GM SI decoder and have found some with K5L.

Looks like tomorrow AM I will visit some yards in hopes that fan assemblies haven't been robbed and or mangled in a front end impact. Already have new 700w motors coming tomorrow.

if you want the 7/9 blade you can find them in hummer H2's and Escalades or others optioned with k5l, seems like they only made the 7/9 blade for a couple years around 07-09
the motors are 700w, left & right motors are different (shaped different and mount different) and so is the way the fan blade mounts

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these motors only fit the 7/9 blade housing

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