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

fans arent coming on

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Old Mar 23, 2009 | 11:17 PM
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Default fans arent coming on

Ok i just bought this 93 camaro and the heads were cracked and radiator busted and clutch was shot well i finally got it back together over spring break and the fans would not come on, right now they are just hardwired in. I have replaced all the relays, temp switch, and the coolant temp sensor. Only thing I can think of is that it is a bad wire or a computer problem. What do you guys think?
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Old Mar 23, 2009 | 11:25 PM
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i had this same problem. its a computer problem. you can either have the dealer reset the code or get a new computer. i got a fan control switch so i dont worry about it
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Old Mar 23, 2009 | 11:26 PM
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what do you mean reset the code? sorry lt1 newbie
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Old Mar 24, 2009 | 04:33 AM
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Stock fans don't come on until almost 230 degrees. Are you sure it's getting to that temperature?
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Old Mar 24, 2009 | 09:25 AM
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Fan and cooling system info
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Old Mar 24, 2009 | 02:42 PM
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Originally Posted by hitmanws6
i had this same problem. its a computer problem. you can either have the dealer reset the code or get a new computer. i got a fan control switch so i dont worry about it
Not always my friend I had a O2 that was bad and was stopping my fans from turning on. if you look at the wiring diagram you will see they run off the same circut
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Old Mar 24, 2009 | 07:49 PM
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I also have a 93 and mine did the same thing. I replaced everything and it wouldnt ever come on. The care would be overheating and still no fans. How do you get the codes reset. Because i even changed the computer and still no luck
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Old Mar 24, 2009 | 07:59 PM
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wow thats crazy whats up w/ all the 93 having this problem. i have it to but im not worried about it i kinda like the way i have it setup right now. i just wired it to the ign and it turns on and stays runing with the key. so after i give it a couple runs down the track i could cool the car down just by turning the ign. on
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Old Mar 24, 2009 | 08:12 PM
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ya mine was like that as well but i just made my own fan single and dual switch. I also didnt state that my fans do come on when i have a check engine light and when i jump the prongs to check codes.
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Old Mar 24, 2009 | 09:06 PM
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Originally Posted by litch2004
I also have a 93 and mine did the same thing. I replaced everything and it wouldnt ever come on. The care would be overheating and still no fans. How do you get the codes reset. Because i even changed the computer and still no luck
Either having a scanner clear them or by disconnecting the battery for about 2minutes (some suggest 5, but I've heard even 10).


What I'd do if my fans didn't work (I always wanted to make one of these ):
Attached Thumbnails fans arent coming on-flow.png  
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Old Mar 25, 2009 | 12:05 AM
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a gm dealer would be able to do it for you but it will cost a lot of $$$
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Old Mar 25, 2009 | 12:08 AM
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o ok. well since my battery is always out oif the car because im always having to fix something i know that wont fix the problem. i guess just using my switch will have to do
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Old Mar 25, 2009 | 06:03 AM
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yes my 94 did the same exact ****, i just bought an slp fan switch and it works fine.
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Old Mar 25, 2009 | 10:30 AM
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Originally Posted by litch2004
o ok. well since my battery is always out oif the car because im always having to fix something i know that wont fix the problem. i guess just using my switch will have to do
You have a 93, so this doesn't really pertain to you, but newer PCMs I believe can write codes to a more permanent memory that will persist through power loss. Those don't trip an SES though, since they're just stored.

Now for you: If a code follows you through computer swaps, then it's a sure sign of the problem not being fixed (whatever the code is for).
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Old Mar 25, 2009 | 12:25 PM
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Originally Posted by Formula350
You have a 93, so this doesn't really pertain to you, but newer PCMs I believe can write codes to a more permanent memory that will persist through power loss. Those don't trip an SES though, since they're just stored.

Now for you: If a code follows you through computer swaps, then it's a sure sign of the problem not being fixed (whatever the code is for).
If the computer is reset or power removed, the codes are erased.
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Old Mar 25, 2009 | 02:09 PM
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Originally Posted by Formula350
You have a 93, so this doesn't really pertain to you, but newer PCMs I believe can write codes to a more permanent memory that will persist through power loss. Those don't trip an SES though, since they're just stored.
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