Trinity switch

[gungfudan]

I installed an electric radiator fan in my Mazda b3000. Right now I have it running constantly when the vehicle is on. I had it wired to thermostat switch but it doesn’t turn on when the AC is on so that causes a problem with the AC pressure getting too high and possibly blowing the seal on the compressor. I’ve been doing research and found that I need to get a trinary switch. Has anyone ever installed a Trinary switch before? I can see that they have female and male primary switches to connect to either the dryer or somewhere else. Does anybody know a specific trinary switch that will fit.

 

[superj]

not me. i have never even heard of that

 

[gungfudan]

not me. i have never even heard of that

It is a switch for your AC. You actually hook it up to wherever your high low switches. Mine is actually on the dryer I think or it’s called the accumulator. Anyways, it’s a three wire switch that allows your fan to turn on when the AC compressor is on. It seems that is the only way you can have a temperature switch and have it turned on with the AC compressor is on.

 

[gungfudan]

Female 10mm Trinary Switch

This is a female trinary switch that has M10-1.25 threads. This switch can be installed on a drier or on a switch port within the high side of the system. The trinary switch performs the same functions as a high/low binary switch and operates the electric fan. Normally Open Switch HPCO: Opens...

coldhose.com

Here’s the website that I found the one I need for the truck. I would say that newer vehicles with electric fans usually have three or more wires my Mazda B3000 only has two because it had a belt driven fan.

 

[Curious Hound]

Never hear of it. I just tapped into the positive wire at the compressor and used that to trigger a relay.

 

[Curious Hound]

Female 10mm Trinary Switch

This is a female trinary switch that has M10-1.25 threads. This switch can be installed on a drier or on a switch port within the high side of the system. The trinary switch performs the same functions as a high/low binary switch and operates the electric fan. Normally Open Switch HPCO: Opens...

coldhose.com

Here’s the website that I found the one I need for the truck. I would say that newer vehicles with electric fans usually have three or more wires my Mazda B3000 only has two because it had a belt driven fan.

That's cool. I'll have to remember that.

 

[gungfudan]

Never hear of it. I just tapped into the positive wire at the compressor and used that to trigger a relay.

Did you also run a wire from the temperature switch?

 

[Curious Hound]

Did you also run a wire from the temperature switch?

I installed a temperature switch in the lower radiator hose. My current setup is very similar to the tech article using the 2-speed Volvo temperature switch, except that I reverted back to one speed and I don't have AC any more.

So, similar but really different. The truck has evolved over the years. I also installed a fan cutoff switch in the cab so I can turn the fan off during deep water crossings - less stress on the plastic fan and it doesn't splash water up over the engine.