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Miata thermo switch

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Old Dec 13, 2002 | 09:10 PM
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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
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Old Dec 13, 2002 | 10:21 PM
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Re: Miata thermo switch

Originally posted by Ward
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
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.
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Old Dec 13, 2002 | 10:50 PM
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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.
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Old Dec 13, 2002 | 11:53 PM
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Which wires need to be spliced to get that to work? And what else needs to be modified for it?
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Old Dec 15, 2002 | 08:24 AM
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Thanks for help
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Old Dec 15, 2002 | 09:32 AM
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Question

Please post a how-to or write up or something......TIA!!!
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Old Dec 15, 2002 | 10:25 AM
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Originally posted by Alien7
Please post a how-to or write up or something......TIA!!!
A write up?

1. Cut wires.

2. Take old switch out.

3. Put new switch in.

4. Splice wires.

Last edited by RonKMiller; Dec 15, 2002 at 10:27 AM.
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Old Dec 15, 2002 | 10:32 AM
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What year of miata do you get the switch form?

Matt
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Old Dec 15, 2002 | 10:58 AM
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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.
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Old Dec 15, 2002 | 11:19 AM
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as somenone already asked, which year of miata?
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Old Dec 15, 2002 | 11:40 AM
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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)
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Old Dec 15, 2002 | 12:52 PM
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so what year?
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Old Dec 15, 2002 | 08:13 PM
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Originally posted by CantGoStraight
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.
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!

Last edited by RonKMiller; Dec 15, 2002 at 08:18 PM.
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Old Dec 15, 2002 | 08:39 PM
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All that text, and so much help....
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Old Dec 15, 2002 | 08:43 PM
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works on many stock FDs, not all

Originally posted by RonKMiller


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.
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.
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Old Dec 15, 2002 | 08:45 PM
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isn't 210F a bit hot? I manually turn on my fans before it hits that temperature.

Danny
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Old Dec 16, 2002 | 09:02 AM
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Originally posted by DamonB
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)
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.
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Old Dec 16, 2002 | 09:07 AM
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Originally posted by RX7Elmo
isn't 210F a bit hot? I manually turn on my fans before it hits that temperature.
210F is a bit hot, but still in the safe zone. Around 230F is getting close to no-man's land.
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Old Jan 20, 2003 | 05:06 PM
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brining this one back from the dead anyone remember the price of the switch?
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Old Jan 21, 2003 | 09:59 AM
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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
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Old Jan 21, 2003 | 12:52 PM
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what year miata?
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Old Jan 21, 2003 | 12:56 PM
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I beleive its the '90-'93 miata. which has i think the 1.6L engine.
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Old Jan 21, 2003 | 01:04 PM
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Originally posted by fdracer
what year miata?
Dont Know
BUT here is the Part #

MAZDA Part # n350-18-840 - switch.
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Old Jan 21, 2003 | 01:48 PM
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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 #?
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Old Jan 21, 2003 | 01:54 PM
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Originally posted by fdracer
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#
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