How many thermo sensors are there? 2 or 3?

I know the one in the t-stat housing runs the fan.

Where is the gauge signal sending one? and does this one also send a signal to the ECU or is their a seperate one for that function.

D15B7 if that makes a difference and for future reference are the B and H motors the same?

 

Anyone?

 

i beileve there is one on the thermostat housing. when it reaches temp the switch closes and the relay turns on. It also sends a ground signal to the PCM on the same wire so the PCM knows to raise the idle.

 

There are 2 thermo sensors. One is a sending unit and the other is a sensor for your computer. The difference is that there is only one wire for the gauge sending unit and there are two wires for the sensor to the computer.

 

There's a TW sensor and a temperature guage sender on the left front part of the block if you were to look at the engine from the front. I enclosed a capture from the helm's manual pg 10-8 which you can find on this website in pdf format. You are correct about another thermoswitch attached to the thermostat housing assembly.

 

Thanks man, thats exactly what i needed.