cooling fan switch
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
It doesn't have one, fans are controlled by the ECM. You can install one by removing the plug in the heads between sparkplugs 1 and 3. You will also have to rig wiring to a fan relay.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
You do not want fan to operate full time ; overcooling and burnout fan.
Why is fan not working?
Have you checked relay?
Swap relay from 2nd fan?
Have you checked fan works with direct power?
If you decide to do manual contriol ,the relay already has power ; all you need to do is switch the grn /wht from relay to ground.
Best way is to buy a aftermarket switch for the drv side head and use that to turn on fan WHEN the engine needs it.
Last edited by rodj; Jun 11, 2008 at 02:24 AM.
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
You don't want your fan running all the time. You'll burn out the fan motor. Since I don't exactly know all the differences between mine and the '90 fan circuit I can't give presice testing steps. But don't just throw parts at the problem. Get the wiring diagram and start testing, not guessing.
Last edited by 86PACER; Jun 11, 2008 at 03:02 AM.
Thread Starter
Heel & Toe
Joined: Jun 2007
Posts: 16
Likes: 0
have completed all test in haynes repair manual for fans and relay cant find anything wrong i dont know how to check computer/wireing what temp switch should i buy verry hot in Houston where i live and how to hook it up
Racer
Joined: May 2006
Posts: 426
Likes: 16
From: Concord CA
Most of the online and mail order store have kits that will include a switch that (as stated goes between #1 and #3 plug) and a wiring harness that you tap into the Fan Relay. You can also use a manual switch (but as stated, have to manually turn it on and off as required only).
You only have to tap into the one wire of the relay harness (green/white), which is normally a ground signal from the ECM and the kits switch comes on at a lower temp (180 deg or ?) and just grounds the relay to turn on the Fan(s).
You only have to tap into the one wire of the relay harness (green/white), which is normally a ground signal from the ECM and the kits switch comes on at a lower temp (180 deg or ?) and just grounds the relay to turn on the Fan(s).
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Thread Starter
Heel & Toe
Joined: Jun 2007
Posts: 16
Likes: 0
what type of wrench do u use to remove the plug out of the head of a 350 on the drivers side between plug 1&3 a 3/8 rachet with an extension on it will not fit the hole in the plug it is square, and a allen wrench has to many sides on it thanks for the help.
Last edited by dollarbillion; Jun 11, 2008 at 10:53 PM. Reason: more questons on fan switch
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
You cannot buy the right size anywhere. I even tried the Snap on truck and online. They all fit either too big or too small. I had to grind down a short extension to the right fit. Then I had to break that bastard free with a 3 foot breaker bar.
Last edited by 86PACER; Jun 12, 2008 at 01:28 AM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Switch here
http://www.mamotorworks.com/corvette?frame=1.944
Thread Starter
Heel & Toe
Joined: Jun 2007
Posts: 16
Likes: 0
THANKS FELLOWS NOW I CAN GO TO WORK I HAVE EVERY THING LINED UP NOW AGAIN THANKS FOR THE HELP IF I CAN HELP ANY ONE ANY TIME JUST GIVE ME A HOLLER DOLLARBILLION@JUNO.COM
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
The plug is 5/16". As others mentioned its difficult, if not impossible, to find a tool made for the job without fabbing something up. I went to Home Depot and bought a section of 5/16" square rod. I then cut a section and used it as a bit. You'll be able to find a 12 point socket to turn the bit. Took me a few times as the rod kept twisting, but I finally got it.