hey there guys just finshed a LS/VTEC motor runs great but the temp gauge is not working i think it maybe the sensor on the rear of the block ( about 1 1/4" across its brass with two prongs sticking out of it with green center ) its from the 91 LS interga WHAT is that? Does it need to be hooked up? And will it afectt the cooling fan from coming on? only reason is not hooked up is we used a 98 LS block with 20000 miles to do the LS/VTEC so there is no place to put it.
GUYS I NEED YOUR HELP ON THIS ONE !!!! the teg has to be at a car show this weekend `

 

Thermo sensor. Did you wire one in????

 

well teh 2 plugs on the side of the head ect and thermo sensor schek if there pluged in.

 

its not the sensors in the head it the one on the back of the block beside the knock sensor on the older LS and B16 block it has two brass pins i guess you could call them surounded with a green epoxy its about a 21mm socket to remove it what is that sensor

 

But, we are asking if you know about your water temp sensors.

 

i know about the temp sensor in the head that hooked up fine but what sensor is the one at the rear of the block in the 1gen B16 motor and the 90 LS motors thanks for your help

 

on newer motors the temp sensor for the cluster is located on the side of the head.
The thermo switch that controls the fans is on the thermostat housing.

 

that true so in the older ls and B16 1st gen motor that sensor is in the head right or is it in the the back of the block beside the oil presure sensor and knock sensor it has 2 brass plugs that comes out of it and has a green epoxy around it what it that is it a sensor and what does it do i need to know

 

It is the thermoswitch to turn the cooling fans on!!!!

 

thanks for all the help guys does it matter what wire goes in to what side there is a center pin and one close to the out side what wire goes on what side

and what do i do about the themo switch there is no where to put it on the newer (obd 2) blocks

 

ok if i had to can i use the thermostat housing out of a newer motor and thermo switch out of a newer OBD motor and wire it up to the thermo switch thanks again

 

Use the switch on the thermostat housing- yes- the pin location doesn't matter.

 

ok so the temo sensor on the head wont turn on the rad fan with the ECU

 

the sensor on the head is the TW (ECT) for the ECU - the switch in the back of the block is the same (just bigger) as the sensor in the tstat housing on newer models. The TW and thermoswitch (newer models- tstat housing) have the same style connector but are not interchangeable.