Question about temperature sensors on t-stat housing

[89Mirageman]

I have a thermostat housing here from what I believe to be a JDM GVR4. It has two of the small single prong sensors. I think dsm's only have one that works the temp gauge in the cluster. What about US Galant VR-4's? I know I can just plug the threaded hole but I'm wondering what the extra sensor is for? Does anyone know?

 

[Andy_S]

I think dsm's have 3. One for the ecu, one that runs the gauge, and one for the ac. The one for the gauge has a single spade wire to it, which you have two of. I'm sure one of those isn't for the ecu, so maybe its for the ac?

 

[89Mirageman]

This housing has 4, one two prong up on the very top for the fan, one two prong on the side for the ecu, one one prong one for the gauge cluster and then another one prong one. I have no idea what the last one is for. Like I said, my plan is to just plug it because I have no use for it. Just wondering if anyone knew what it did?

 

[G]

Slightly off topic but does anyone have the part # for the one that comes on the mirage that doesn't have all the sensors?

 

[89Mirageman]

The 92-95 Hyundai Elantra's also use the same t-stat housing but they don't have the nipples for the turbo water lines.

Which Mirage housing doesn't have the sensors? I assumed they all used the same sensors and were close to the dsm housings.

 

[G]

I'm not sure which model it is, but I know it exists.

 

[brisvr4]

Is this what you are looking for?

 

[89Mirageman]

^^^^^Yep, that must be it. #4 is the one I'm asking about. So it has something to do with the AC or an automatic transmission?

 

[brisvr4]

It's kind of a failsafe switch. If your coolant temp rises too much it will switch on both fans to high.
A few of us have it connected to a switch in the cabin so the fans can be turned on and off at will.
Easy way to check it is to ground it out while the engine is running, fans should turn on.

 

[89Mirageman]

OK that makes perfect sense. Wonder if the US spec GVR4's have that extra sensor on them or is it plugged from the factory?

 

[toybreaker]

Yes, usdm vr4's have that sensor.

It's located on the rear of the housing, and had a black/blue (or maybe blue/black} wire running to it.

I *believe* grounding this wire will also disable the a/c clutch.

 

[89Mirageman]

Cool deal, thanks for clearing this up guys. Learned something new.