Miata thermo switch
 

the miata thermo switch activates fans at 210 degrees compared to stock 226. this looks like one of the best ways to keep the car cool. so why do i not find much about it? it would seem more people would go this route. from what i can find it is a direct replacement, just have to splice some wires, but i have been unable to find a definitive answer to whether it works for all years. the question was raised if it did, but not effectively answered. so i'm hoping someone can clear this up for me. it looks to be the best way from what i've researched, wondering why more people dont go this route. thanks for all help

Re: Miata thermo switch
 

It works on all stock 3rd gens, do it. It is the way to go instead of screwing around with ALL the other other fan mods....just use some crimps and put some heat shrink tube around it. Simple is good.

I have one and will be installing it along with my rebuilt motor. Hopefully it works as well as it's supposed to. I don't see why people don't do this instead of other fan mods.

Which wires need to be spliced to get that to work? And what else needs to be modified for it?

Thanks for help

Please post a how-to or write up or something......TIA!!! :D

A write up?:rolleyes:

1. Cut wires.

2. Take old switch out.

3. Put new switch in.

4. Splice wires.

What year of miata do you get the switch form?

Matt

Wow nice write up on the how to. Kinda like replacing a motor,
Motor Replacement how to:
1) remove anything attached to the motor.
2) remove motor.
3) install new motor.
4) hook everything you took off back up.
5) easy as pie.

as somenone already asked, which year of miata?

I agree that the Miata thermoswitch is the best solution. I just put mine in and it's actually cool here in Dallas so I can't comment on max temps yet. The Miata thermoswitch directly replaces the stock one in the back of the water pump housing, only difference being that the connectors are different. The thermoswitch has a single male lug so I merely spliced a small female spade lug to my harness to wire it up. No trouble at all.

Here is the part number in this thread Miata thermoswitch (although I bought mine from the auto parts store for a little less money)

so what year?

All I can say is if you don't have enough mechanical or intuitive skill to replace a simple switch, this is not the car for you. That's why God gave birth to Sorichito Honda.

My somewhat sarcastic post should have been simplified even further to describe this very complex and daunting task: Do you know how to screw in a light bulb?

OR, how about this:

Q: How many "electronics technicians" does it take to change a light bulb?

A: Two! One to post the question and another one to open the beer!:rofl: :flipoff:

All that text, and so much help....

works on many stock FDs, not all
 

For some (+ me), gets fans at med (ac off) at 207F at switch. For others, it will not do much ... fans at med (ac off) at 221F, vs low at 221F and med at 226F (ac off).

Quick test:

Switch has single wire to it, buried behind wp. Just ground this wire with ign on, eng cool ... if fans come on, then miata switch will work directly. If you have added 'fan mod' switch and enjoy on demand fan use with no delay, also good indicator miata switch works directly.

If u fail test, then your model's 226F fan switch circuit is looking for the 221F ecu based low speed trip to happen first. Work around concept is found at the voodooxxx link at cirian site, section on 'fan mod' switch.

isn't 210F a bit hot? I manually turn on my fans before it hits that temperature.

Danny

DamonB, thanks for the info. Just what I needed to know!! :)

RonKMiller - lighten up buddy. No need to be a 16-year-old jackass. On the other hand, I welcome all sorts of constructive criticism. :p:

210F is a bit hot, but still in the safe zone. Around 230F is getting close to no-man's land. ;)

brining this one back from the dead anyone remember the price of the switch?

i believe i got it for around $40 (? i'll have to doulbe check) or so from my dealer, so 25% more from other dealers

what year miata?

I beleive its the '90-'93 miata. which has i think the 1.6L engine.

Dont Know
BUT here is the Part #

MAZDA Part # n350-18-840 - switch.

yeah, but i wanna get mine from an auto parts store not the dealear, so it'll be cheaper. wouldn't whatever brand the auto parts store uses have a different part #?

Maybe BUT it will be Cross refferanced to the MAZDA part#

I got a 93 miata thermosensor and it has 2 connecter posts and my 94 rx7 sensor only has 1, did i get the wrong sensor or is there a way to hook up the 2 post sensor?

Sounds like you have the wrong part...I recently did the install and it had only one connector post. Btw...you need the miata thermoSWITCH.:)

sorry nevermind i had the part store cross ref the above part number and i got the wrong sensor

i know this is old but what do yous guys do as for the plug?? because the miata switch is a different style plug?? can you get the plug from older 7's or some other mazda's??

n/m i found it. just so that others dont know you can get the plug from 90's ford probe or early 90's mazda 626 from the junkyards

You can cut the plug off a Miata, or just use a normal bladed connector. I just soldered in a female blade style connector and made sure it fit nice and snug. A miata harness plug would have been nicer.

Dave

i was thinking about using the female blade connector but i had a doubt about it falling off in the future....

I pinched mine a little to make is clamp very securely.

Dave

^I did the same thing, and then filled the area around the connector with silicone caulk to secure and insulate it.

Just to complicate the picture, it appears that the Miata thermoswitch is only a "remove original, screw in replacement" situation for the early FD engines. Later model years appear to have a different hole size/threads that the Miata thermoswitch does not fit. Even tho I have a '93, it has a reman engine (? yr), and the Miata thermoswitch does not fit.

That's the first I've heard of that. Mine is a 94, with a reman from 00. The t/s fit just fine.

Dave

There was some talk of the FC thermoswitch being a perfect fit replacement, with no cutting or soldering of any lines. Did anyone ever try the FC switch?

Adam, I'll be the first to try. Can anyone suggest a place to purchase the FC switch (that won't rip me off).

~Mike

Mike, Please post your results. I am very curious to hear about it.

Thanks :)

will this work if your running a PFC? Pm me