How To: '99-'04 GMT800 OEM E-fan upgrade

Black02Silverado

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Scott, it's been a year and you still haven't upgraded your alternator? :nonod:

Nope. I did the big 3 hoping that would solve it. It helped tremendously, but my voltage still dips sometimes if both fans kick on at idle. Once I rev the engine it goes back up. That's why it hasn't been a huge priority for me. :dunno:

I would thing that putting that much of a draw on that little amp alternator, that it will not last to long, probably getting super hot trying to keep up.
 

5.3silverado

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I am wanting to do this efan swap and looking for radiator I found different thickness which one do I need and do I reuse my original radiator hoses?

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5.3silverado

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Fan will turn on with a/c and when the pcm detects coolant temp high both fans will turn on.

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5.3silverado

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I got electric fan unit bought $100 and I am gonna buy new radiator $155 and I found a 145 amp alternator. The last thing looking for is wire harness.

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daddy

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So that wiring job kicks on the fans automatically still or do you have a switch?

You have to have it programmed as well. :BBP: can do that and they sell harnesses as well, if desired.
 

ScottyBoy

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If you got the fan plugs/pigtails with your fan, then you can make your own harness using the wiring diagram I posted in the beginning of the thread. I would use 40 amp relays and 10 gauge wiring.
 

5.3silverado

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I have access to a tech 2 scan tool can I turn on e-fan opt with that?

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