ffrh911

iTrader: (2)

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

BadBlackZee

iTrader: (5)

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?

the_merv

iTrader: (88)

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.

arctic white 94

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.

the_merv

iTrader: (88)

I had to install Manual Switches..I've done it to quite a few LT1 cars.

arctic white 94

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.

the_merv

iTrader: (88)

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?

RamAir95TA

iTrader: (2)

Do you have any aftermarket PCM programming? Perhaps you aren't getting to the temperature needed to turn on the fans.

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?

RamAir95TA

iTrader: (2)

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.

arctic white 94

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

the_merv

iTrader: (88)

Here is how I wired in the switches..

arctic white 94

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.

RamAir95TA

iTrader: (2)

If you want, you can simplify it with one switch to run just the high-speed. That's what I did.

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?

RamAir95TA

iTrader: (2)

http://www.worldisround.com/articles/12201/photo28.html

That's how I run mine.