Has anyone installed this sensor with the engine intact?
I am trying right now and having a very hard time.

thanks,
jason

 

You'll probably have a better angle at it if you remove the alternator.

 

I had to remove my alternator to get it. I couldn't get enough grip on the thermoswitch to undo it otherwise.

 

Do you think it's possible to get at it with a deep socket and ratchet? It should fit right over the electrical connector.

 

where exactly is that Thermoswitch located at and is that miata one direct replacement or what? Can you guys give me a little more info on it.

thanks

 

The Miata thermoswitch will screw right in, but it has a different connector. I ordered my thermoswitch from Ray @ Malloy Mazda and he have me a little wire to raplace the connector that is already on the car.

The thermoswitch is on the engine side of the coolant filler neck. Underneath the pressure chamber, below the coolant nipple and ECU thermosensor (has a green connector).




(Hey, check out my levatating wastegate and turbo pre-control solenoids!)

 

How much was that thermoswitch and at exactly what temp F, does it turn the fans on.

 

207F instead of the FD stock 226F.

Check this thread for more info:
https://www.rx7club.com/forum/showth...threadid=26910

 

Are you sure about that temp? KDR quoted me for a 180F Miata Thermoswitch. The same info appears on their website as well. Did Miatas come with 2 diff thermoswitchs? Or does someone have their info crossed?

 

Are you sure they weren't talking about the "Thermostat"?

The FD thermostat doesn't open all the way until 180F. Having the fans on at that time wouldn't be a good thing.

 

there are other switches that fit in that locationl. i cant remember the exact year, but david garfinkle has an eclipse unit in his. fits right in. he got a list of them that had the same thread pattern with their operating temperature listed to the side. he chose the eclipse unit. . . ill get the rest of the info later.

paul

 

cool, Thanks Mahjik. One more question, that connector that i will need with that thermoswitch, can i just connect the wires directly without using connector?

 

The Miata has one spade while the stock connection has two, or the other way around. I can't remember.

 

Here ya go:

 

does anyone know which year miata the thermoswitch is from, or is it from any year?

 

it cost me 56.00 at the mazda dealership

 

They are both single lead on mine.

 

Really? Hmm... I guess old age is setting in or something

I just remember having to mess with it somehow.

 

Oops, I just checked the sheet again. My bad. You're right Mahjik... again...

 

Hey guys, I went to auto zone for this thermoswitch, but they have two of them. So which one of these is it. I have pictures of both.

 

Hey guys, I went to auto zone for this thermoswitch, but they have two of them. So which one of these is it. I have pictures of both.

 

Check with Ray at Malloy next time, he would have saved you about $20.00....

 

BoOsTin FD, That looks like the water thermoSENSOR, not the thermoSWITCH, but I could be wrong. I'm just judging by the electrical lead.

 

FD t-stat starts to open at 180F and is fully open at 203F, per factory manual. My mazda spare t-stat is stamped 82C (=180F), which normally indicates initial opening point from closed.

Miata switch ...

The miata switch is N350-18-840, single small pin and o-ring under the hex nut section. 207F rating. Works on most FD's, not all. Simple test is ground the wire to the switch with ign on, engine cold. If fans come on, it will work well. If not, still no fans 'til 221F. Another positive sign, if you have the fan-mod switch, is fans come on whenever switch is on, with ign on.

 

Yeah i can't post the other picture. So that one is not the right one, that the other one is.
Thanks Jonski