LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Cooling system question

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Old Jan 29, 2010 | 02:33 PM
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Default Cooling system question

Neither one of my fans come one. I recently replaced one of the motors. Im going to jump the three fan relays when I get off of work. Just wondering what else could be wrong with it. Thanks in advance
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Old Jan 29, 2010 | 02:47 PM
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I would place my money on relays...if neither comes on. Does the high fan jump on when you have the A/C on when the car is running?
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Old Jan 29, 2010 | 03:10 PM
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There has been a bunch of cars that the PCM stops sending the signal to turn the Fans on..mine did it as well as many others.
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Old Jan 29, 2010 | 05:52 PM
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Sorry to hijack the thread, but did you have to replace the computer to get them to work? Mine still come on when the check engine light is on but no other time.
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Old Jan 29, 2010 | 11:43 PM
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I had to install Manual Switches..I've done it to quite a few LT1 cars.
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Old Jan 30, 2010 | 01:26 PM
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I will probably end up doing that. Would replacing the computer cause them to work again? Mine quit working whenever I changed the sensor in the water pump but the sensor is reading the correct resistance for what the temp guage says.
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Old Jan 30, 2010 | 01:59 PM
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Man that is how alot of them go out..don't know about the PCM idea. I kept the wiring intact and I'm using them with my LS1 PCM..no issues, works great.

I wonder if there is some kind of reset that has to be done. Mine were working till I messed with the Water Pump for the very first time.

What you think Rob..you ever heard of anything of this nature..as in a reset?
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Old Jan 30, 2010 | 02:26 PM
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Do you have any aftermarket PCM programming? Perhaps you aren't getting to the temperature needed to turn on the fans.
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Old Jan 30, 2010 | 02:43 PM
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no my tune is stock. I checked all the relays and they are all good. I read somewhere that you can short out the wires to get the trouble codes and if the fans come on then the computer is capable of running it.(my fans came on when I did this) Is this correct?
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Old Jan 30, 2010 | 02:48 PM
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Originally Posted by arctic white 94
no my tune is stock. I checked all the relays and they are all good. I read somewhere that you can short out the wires to get the trouble codes and if the fans come on then the computer is capable of running it.(my fans came on when I did this) Is this correct?
You cannot jump the pins in the ALDL connector on a 94+ vehicle (only 93 models).

If your tune is stock, the fans are not programmed to come on until 227 degrees, so if you're coolant isn't getting to that temperature, they won't come on. Probably a good bet that there's nothing wrong with your fans.

If you want to test the fans, jump the relays in the underhood fuse box from D2 to J2 and then to a 2-pole switch (optional) and then to ground.
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Old Jan 30, 2010 | 02:56 PM
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They do not come on at all. It will get almost into the red and they still do not come on. I have jumped the relays and the fans will work that way. I wish I could get them to work correctly just in case someone else drove the car and was not paying attention.

thanks for all the help so far. please keep it coming.

my car is a 94 z28 if that matters
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Old Jan 30, 2010 | 03:43 PM
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Here is how I wired in the switches..

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Old Jan 30, 2010 | 05:12 PM
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thanks for the diagram. I will hook this up when the snow clears out. I think i'll mount my switches in the ash tray.
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Old Jan 30, 2010 | 05:19 PM
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If you want, you can simplify it with one switch to run just the high-speed. That's what I did.
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Old Jan 30, 2010 | 06:26 PM
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Yeah that's probably what i'll do. The only time I would really have to turn it on is when i'm in the drive thru or something. It does fine on the freeway where the wind passes through the radiator. thanks for the help.

If I spliced it into the wires above then it would still cut off with the ignition right?
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Old Jan 31, 2010 | 12:54 AM
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Originally Posted by arctic white 94
Yeah that's probably what i'll do. The only time I would really have to turn it on is when i'm in the drive thru or something. It does fine on the freeway where the wind passes through the radiator. thanks for the help.

If I spliced it into the wires above then it would still cut off with the ignition right?
http://www.worldisround.com/articles/12201/photo28.html

That's how I run mine.
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