ok the on the fc what does the water temp switch do? it that little thing on top of the thremostat housing. if it doesnt read temp and its not for the gauge so what the hell does it switch or do? tyvm in advance
-James nj

 

well on mine it runs the fan thats infront of the radiatior

 

idk because i think the fan is mechanical not electical i mean im running an aftermarket fan and radiator but i think that thing does something else does anybody know what it does exactly

 

i looked in the shop manula and it said that thats for the fan that that thing is for the fan infront of the radator.

 

the cooling fan

 

ya

 

If it's the one on the back of the water pump and between the thermostat and radiator, it's the one that sends water temp readings to the fuel control unit. If it's unpluged or bad, the car will default to hot temp mode and will lean out the fuel mixture making starting difficult.

BTW, there's a third temp sensor on the bottom of the radiator. I don't know what it does and I have no clue why mazda couldn't have just made one temp sensor for everything.

 

i think the one your talkn about is used to change the idle advance for engine warm up

 

It's for the extra electric fan that comes on some FC's, mostly turbo I think. It provides extra cooling when the A/C is on.

 

you sir are correct found it in the haynes manual. what are these other people talking about? tyvm merry xmas
-James nj

 

lol well thats what i was meaning when i said fan im sorry if i messed you up.

 

so does the temp sendor on top of the thermo stat housing provide a grounding type switch?

obviously it isnt going to produce power so if i hook my relay upto that with the sensor hooked up to the earth side of the switching circit( on the relay ) i can use it as a thermo fan thermostat swtich?

 

It is used as a gnd for a Auxillary Fan that sits in front of the radiator/a/c evaportator. The trip temperature is 209 degrees F. Sounds a touch high for what you want to do. Maybe not. Have a go at it.

 

na that is a bit high, to high for my liking anyway. Is there anything that is already in the car that can be used for a temp switch that is more around the 185-190 level?