LS3: Apparently I need three coolant sensors

[Mkelcy]

There's also a two output temperature sender from an LS1 Camaro that may work. This was the first link I found with part numbers: http://www.ls1truck.com/forums/lsx-t...re-sensor.html

[marks914]

Yes for any setup you probably will have to run 3 senders, each has their own ohms range. But 2 should be in the engione, one in the radiator (fans)
Mark

[79 Camaro]

The other solution is to weld a pipe thread bung into the radiator assuming it's aluminum. I did that on one of my LS swaps. Placed it down near the bottom of the tank on the drivers side. Welding shop charged me about $25 for some pretty tig welding.

[Chris442]

If you want to run those three things, you'll need 3 senders. It's worth noting that the ECU is capable of PWM fan control; all Corvettes have had it since 05. I have this set up with an LS7 in a '68 Camaro. I also use an A/C pressure sensor for the computer to run the fans for that. Without going into too much detail, you'd need the PWM module from a Corvette to make it work and be able to set, or have somebody set, the computer to work it.

As to the third location for a sender, I used the block drain above the starter, but haven't had great success getting accurate readings. It's good until the engine is warm, then it keeps going an extra 20-30* from the ambient heat down there. It could be that the adapter I've used for the sender has it too far out of the water flow to read right, but I haven't tried to fix it yet. Basically buyer beware on using there to read.

Another option I've see is drilling and tapping the water pump by the thermostat, IIRC. I've never tried it, so no first hand experience there.

[camcojb]

I have never needed three senders for the three things. Every ECU I've used has a fan control built in, and it uses the same coolant temp sender for the ECU and for determining when to ground the fan relay, controlling the fan.

If your computer doesn't have fan control then the above ideas will work fine.

[BonzoHansen]

Originally Posted by Chris442

If you want to run those three things, you'll need 3 senders. It's worth noting that the ECU is capable of PWM fan control; all Corvettes have had it since 05. I have this set up with an LS7 in a '68 Camaro. I also use an A/C pressure sensor for the computer to run the fans for that. Without going into too much detail, you'd need the PWM module from a Corvette to make it work and be able to set, or have somebody set, the computer to work it.

that's pretty wild I did not know that. Only corvettes get that?

[Chris442]

Originally Posted by BonzoHansen

that's pretty wild I did not know that. Only corvettes get that?

That's all I know about, for sure. I can say for certain that G8s, GTOs and new Camaros don't have it, though. Based on what's available in HPTuners, I'd guess it could be made to work with any of those computers, but I've never tried it.

It's been working great on the Camaro for the last 3 years and 15k+ for me. With the big Ron Davis and dual Spals, you rarely hear the fans run, since they're almost never at 100%.

[BonzoHansen]

Originally Posted by Chris442

That's all I know about, for sure. I can say for certain that G8s, GTOs and new Camaros don't have it, though. Based on what's available in HPTuners, I'd guess it could be made to work with any of those computers, but I've never tried it.

It's been working great on the Camaro for the last 3 years and 15k+ for me. With the big Ron Davis and dual Spals, you rarely hear the fans run, since they're almost never at 100%.

I have a DCC in my car and even with one of the fan motors having a bad bearing I still don't hear them. At idle on a 90* day they hover around 6-7 volts. I had no idea GM was using PWM.