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Installing Electric Fans

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gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

I used my BAW for the nut, left the belt on, tapped lightly with my BFH. Sent from my Samsung Galaxy S4 using Tapatalk 4

exactly !!!

 

for the real nasty fans that dont like that technique ,alittle aggresivness is required ,i use my snap on air chisel and on an angle on the fan nut flat ,hit it ,that fan spins off every time ,,,best $100 i ever spent was that tool

SteveLNew New Member

SteveLNew

Posted
Posted

I dont know what year your truck is but if its 03 up you reference the pcm via pin 42 on the blue connector it can ground a relay as that is all it does with the stock arrangement. You have no a/c(defrost) system control though either way, just engine temp. Even 99 to 02 is the same deal but those don't have the a/c control anyway.

 

You need the pcm tuned though to activate the pins and set values for on and off though. Its not enabled as the truck sits.

 

Fan removal is simple. I don't tap or anything. I have big wrenches and I think its 1 3/8" that fits. Hold the water pump with a makita grinder disc tool and off it comes... no matter how seized up it is.

 

Sent from my SGH-I747M using Tapatalk

 

 

It's a 2003 Z71.

So tapping into the ECT won't work? I didn't think it would just because it's not an on and off switch it just tells the temprature. I knew I could do it the PCM way, it's just another expense I am trying to avoid, and my Hypertech won't do it I don't think. I may have to buy and in the block theromstat to finish it up. Should only be another $10-$20... I hope.

 

 

 

Chawkins... You have to be a Marine... I haven't heard that kind of talk since my Marine Days!!!

Chris Senior Enthusiast

Chris

Posted
Posted

Ex air force spec ops aircraft tech

 

Sent from my Samsung Galaxy S4 using Tapatalk 4

 

 

Badass69 Senior Enthusiast

Badass69

Posted
Posted

Ect is resistance.... won't do anything for you. My setup with OEM junk can be had for 100 or less BTW....

 

Sent from my SGH-I747M using Tapatalk

  • 5 years later...
Ghost03 New Member

Ghost03

Posted
Posted

Do you have to replace your radiator with a biger one in order to install a direct fit electric fan assembly? Im planing on doing this upgrade to my 03 silverado but i dont want to replace my radiator.. is not leaking so i was wondering if you actually have to replace for a bigger one  or you can just go on line a buy a dual fan assembly that will bolt right in. Is there any one thay can give me a website or a clue on where to find one ? 

sefiroxx Enthusiast

sefiroxx

Posted
Posted

In general, no, unless you are running hotter and need more cooling (baja).

Also, depends on design of the fan.

https://www.summitracing.com/parts/flx-292/year/2004/make/gmc/model/sierra-1500

Is an example of a direct fit fan that would work with existing radiator using the existing mounts (two side tabs that go where the lower shroud would go and two upper holes where the upper shroud would go)

Some of the more powerful fans would require custom mounting and possibly different radiator. But it's all custom at that point and that is up to the installer and money.

  • 1 month later...
Mrsuburban New Member

Mrsuburban

Posted
Posted

How can this be done without the pcm tuning I've heard its sometimes its too hard to do on the 2000 models and sometimes it won't work some  people online are charging me about $150.00 to try to tune it so someone please help out I got the 05 fans and the factory style harness with relays is there a place I can tap a grounded temp sensor to

  • 2 weeks later...

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