What did you do to your NNBS GMT900 Tahoe/Yukon Today?

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mikeyss

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the shroud is bigger, one side is 9 blade the other 7 blade and the motors are 700w each versus 500w each, the stock one on mine has (2) 5 blade fans, fitment is the same frame wise but the HD shroud is about 2.5" thicker probably because of the bigger motors but I will know more once I dive into it, this one is from a hummer. I don't really have a specific reason for doing this other than it's freaking hot here in the summer, not really desert hot but hot enough and I just like things a little more heavy duty than normal I am kind of rough on my vehicles. I am going to take these old motors out and pressure wash it and clean it up and try see what I can put on it to make it look like new again.

I did something similar to my 09 tahoe, but I used the 2011 and up HD fans, they are of different design. They are 5 blades on both sides with no rim to the fan blades, and one fan is a 700w and the other is a 900w. I'll try and find a picture.
 

gpracer1

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I did something similar to my 09 tahoe, but I used the 2011 and up HD fans, they are of different design. They are 5 blades on both sides with no rim to the fan blades, and one fan is a 700w and the other is a 900w. I'll try and find a picture.

Yeah I was wondering about that....mine has HD cooling with two 5 blade rimless fans.....2013
 

mikeyss

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Yeah I was wondering about that....mine has HD cooling with two 5 blade rimless fans.....2013

From 2011 or so they all went to 2, 5 blade rim less blades. The non HD had 2 700w 5 rimless blades, and the HAD had 2 5 rimless blades with a 700w and 900w motor.

s-l400 (1).jpg s-l400.jpg
 

gpracer1

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I’ll have to hook up the EFI Live this weekend and command the fans on full an see how they blow.
 

Doubeleive

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I did something similar to my 09 tahoe, but I used the 2011 and up HD fans, they are of different design. They are 5 blades on both sides with no rim to the fan blades, and one fan is a 700w and the other is a 900w. I'll try and find a picture.
are you sure about the 900w? there is nothing available above 700 that I can find and I did quite a bit of digging before I pulled the trigger, I did find different combinations of fans, dual 5 blade, dual 7, dual 9, and combinations of 5/7 7/9, some were for towing packages.
 

mikeyss

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are you sure about the 900w? there is nothing available above 700 that I can find and I did quite a bit of digging before I pulled the trigger, I did find different combinations of fans, dual 5 blade, dual 7, dual 9, and combinations of 5/7 7/9, some were for towing packages.

I may be wrong about the 900w, but you are also using the 1st design fans not the 2nd design ones like I have. The 2nd design came out in 2011 or 2012 and only have 5 non rimmed blades per side regardless if it had HD or non HD cooling. The motors themselves were what GM changed in order for HD cooling, so after checking Rock Auto, the 1st design fans had numerous fan blade counts and 2 different motors, while the 2nd design has 500w or 700w motors depending on if it was HD cooling or not. When I searched for the 2nd design, it was much harder to know if they were the HD cooling because they all have 5 rimless blades, but there is a part number on the upper shroud that differentiated them. I also found that the 2nd design non HD cooling ones sound weaker than the HD cooling ones.
 

Dempski13

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Oil change and bath, tight on time before a trip so i decided to pay for the oil change.. man what a mistake, $140 CAD. I usually buy oil on sale for $32 per 5 L jug... and filter on sale for $12-18. Never again.
 

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