zapp168

iTrader: (7)

Ok so I am fairly ok with repairs.....at least I thought. I am workin on a 93 LT1 firebird. The fans don't come on. No big deal right? So, I hook up my trusty ol "brick" (snap on scan tool) go under special tests and power on the fans, both fans click on and off as ordered. Ok next test I let the car run and watch the scanner 200...210...220...230....and the bottle starts to steam a litte, so I shut er down all the while the scan tools reads "fan request no" Ah says I bad computer...it is showing the correct temp but not turning on the fans. I install a new GM computer....same thing.....Ok must be a bad PROM I order one from GM......SAME THING? I thought there is only one temp sensor and the fans are turned on VIA the computer. Anyone have any ideas???? I mean any? .....................THANKS!!!

LT1Falcon

iTrader: (3)

run a manual fan switch?

onephatZ28

iTrader: (8)

Read this and see if this helps
http://www.theherd.com/articles/lt1_cool.html

zapp168

iTrader: (7)

The car HAD a manual switch, I am working on eliminating it, and that article was VERY informative, I am going to let the car run a few more degrees, see if it works, then reprogram if they do come on.......thanks

carzman5678

HMMMMM, LT1 has a fan switch on the front of the water pump and a temp sensor on the cylinder head for the gauge.

LT14MULAWS-6

iTrader: (2)

call your local dealer parts department with your last 8 digits of your vin and ask if there is a fan relay available. Obviously if the fan kicked on when u tested on a scan initially than your connection is good, i say check for a relay, chances are thats probably why they had a hotwired fan set up in there to begin with...

the_merv

iTrader: (88)

Some one at one point wired mine to come on at 30 seconds after startup, and shut down when I kill the car. I haven't figured that one out yet..they work so I am not ******* with it..

zapp168

iTrader: (7)

The problem was the PROM chip, I replaced it and everything works fine....Thanks all for posting

Captainofiron

iTrader: (1)

I want to rig my car to run the fans by order as the computer tells it, but also by a switch. Wouldnt be that hard to do, just need to find which one is power and which ground.