nhra-trans-am

iTrader: (7)

So my LS1 91 Firebird is now running. It currently has a 3rd gen radiator with the single fan. The fan is hooked up to pcm and works, but I'm wondering if the single fan is enough to cool the engine properly since the 4th gen has dual fans. Your help is greatly appreciated. Thanks.

ZONES89RS

iTrader: (2)

I have the stocker on my 89 with a front mount pusher, works great, my 86 TA with the stocker and no pusher gets hot when i beat on it or just cruising, but it is a T56 in the 89 and a TH400 in the 86, but i think the 86 still needs a pusher.

Stock third gen duals would work great i think.

Jim85IROC

iTrader: (2)

Stick with the fan you have and watch your temps. If you start to see them creeping up, then it might be time for more fan. On the thirdgens, as far as I'm aware, the 2nd fan only comes on when the A/C is on, so unless you rewired it to run both fans all the time, the single fan is likely to do more than the dual fan setup in most cases.

Pocket

iTrader: (24)

Single worked great for me

IrocZ'85

iTrader: (9)

I was actually going to make a quick thread about this, just wondering if when using our single large fan setup, how does it connect to the pcm? I've got the wiring diagrams and will be looking at them more closely in a bit, but do i need to run a newer style relay for the fan?

cam-

Stock single puller and never ever once left thermostat temps. Shocking really

Pocket

iTrader: (24)

Use the fan 1 or low speed fan when wiring it in. Some diagrams label it differently, but its the same thing. If theres even a passing chance you may want to upgrade to dual fans later, go ahead and run the fan 2/hi fan PCM wire to where you're mounting your relays

cam-

I ran both hi/low to one relay on my last LS1. Not saying its by the book but it worked aces for a few years

Pocket

iTrader: (24)

Thats works too

kizmaro89

Stock single fan without any overheating problems.

1ADan

iTrader: (4)

my setup's not done yet, but I'm giving the single a shot and seeing how it does. I did wire up my harness and got my pcm programmed for 2 just in case its not enough though.

nhra-trans-am

iTrader: (7)

Thanks for the replys. I am going to stick with the single fan and see how it goes.

alan91z28

On my LS376/480 setup when it was NA i was using just the standard 3rd gen single fan and it worked fine without any issue

This year when i have added the TVS2300 and put a big heat exchanger for the TVS in front of the existing rad, the single fan couldn't keep up even in cool temps... i changed to a Be Cool high eff dual fan and it works great in that application, keeping both water temp and intercooler temps in line

406TPI

iTrader: (1)

I run the stock single fan as well. I also run A/C and a magnacharger heat exchanger up there too....never overheats. I do have a big griffin rad though.

nhra-trans-am

iTrader: (7)

Tested it out with a 98 Coolant Temp Sensor and it seems to be getting the job done.

IndMuscleCar

Stock Single puller for me. Gets a bit hot after hot lapping a few quarter mile passes, but then again, it makes pretty good power (782 RWHP)

86White_T/A305

Single fan will work fine,and you can have it tuned in the pcm to turn on sooner if you like.I have dual fans on mine and no a/c.Second fan is my fail safe incase the motor ever started getting too hot..comes on at 210* and I also have a it wired to my a/c switch to turn it on manually if I need to.Havent yet but on the really hot days it has kept the motor at 180* in heavy traffic and never budged.