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Hello everyone
I have a 1986 Camaro 5.0 TPI that i had some problems getting the cooling fan to work. Finally fix it buy taking the computer cover off and reseating the prom and that finally sent the ground signal to turn the fan on. My question is i want to install the coolant fan switch that turns on at 185 degrees on the left side of the block using the coolant drain plug location and then tie in the wire to factory wire which turns the fan on. Since this system works by the ECM sending a ground signal to turn the fan on I would be doing the same thing just earlier. Do you think this could damage the ECM by back feeding a ground signal to the ECM also?
You could run a more classic setup and bypass the computer
Except that is where the Temp gauge sending unit goes. The fan thermostat goes on the passenger-side cylinder head between #6 & #8.
Also; while the relay will work that way, the "proper" way is to run pin 30 to the + battery terminal with the fuse, and 87 to the + side of the fan...
I have an 84 with a 350 and 700r4 and the only thing hooked up to the ecm is the transmission. I put LS1 fans in and upgraded my alt from 78 to 110 as the fans are a 40 amp draw. I have the relay and fuse and everything set up to the key. It has a temp switch that turns them on at 185 and off at 165 most of the time. Sometimes they don't come on at all and I can't figure out why. The temp switch i put in the top of the thermostat cover could that be it? Should I move it down to the manifold? Is it possible to add a switch so if they don't come on with the temp switch I can manually turn them on?
I have an 84 with a 350 and 700r4 and the only thing hooked up to the ecm is the transmission. I put LS1 fans in and upgraded my alt from 78 to 110 as the fans are a 40 amp draw. I have the relay and fuse and everything set up to the key. It has a temp switch that turns them on at 185 and off at 165 most of the time. Sometimes they don't come on at all and I can't figure out why. The temp switch i put in the top of the thermostat cover could that be it? Should I move it down to the manifold? Is it possible to add a switch so if they don't come on with the temp switch I can manually turn them on?
Nice! You got a pic? Im planning to do a LS1 fan swap soon and curious to see how you mounted it / cut the shroud etc...
Sounds like the temp switch is possibly bad and not working all the time? or if you put teflon tape on the switch? If you put too much it won't be able to ground properly....Id move it to the manifold for best grounding if possible though.... Are you using 2 separate relays? The Ls1 fans suck lots of juice so if you are using one relay it could be shorting it out,,,that happened to a cheap relay I had for something else..it was burning out and worked intermittently.
I have my auxiliary fan set up on a separate circuit from the OE fan and to come on automatically but I can control it manually as well cause "just in case" and it's super easy..........basically you just put a switch you can ground between the fan and the grounding temp switch you have....just splice into the wire going to your temp switch and have it ground when you flip the switch.
The mnual switch wil lalways turn the fan on......If it doen;t always work with the manual switch then you have some other issue before the switch though.. You;re just putting the manual switch between the relay and PT770 in the other pic on this thread...
I have an 84 with a 350 and 700r4 and the only thing hooked up to the ecm is the transmission. I put LS1 fans in and upgraded my alt from 78 to 110 as the fans are a 40 amp draw. I have the relay and fuse and everything set up to the key. It has a temp switch that turns them on at 185 and off at 165 most of the time. Sometimes they don't come on at all and I can't figure out why. The temp switch i put in the top of the thermostat cover could that be it? Should I move it down to the manifold? Is it possible to add a switch so if they don't come on with the temp switch I can manually turn them on?
When I first started running dual fans I had issues with a single thermal switch turning on two relays. I ended up installing a helper relay to keep thermal switches from blowing out.
I only have one relay and its hooked to the key. I used my drimmel to cut the hold down so the fans fit under it. I also bolted the fans to the bottm of the radiator so it is nice and soild. Battery power and the ground for the passengers side fan. I have the temp switch here cause i used where i had it before in the manifold for the heater hose.
This is the easiest way I found to control an electric fan. The small relay has an adjustment to control when the fan comes on and also you can add an over ride switch. Easy to hook up and small. I just eliminated the ecm control and use this set up instead, car runs under 180 degrees during the summer in Texas. I added a switch inside so I can turn on both fans if I want, but so far car stays cool with only one fan running.
