well i'm not sure if most noticed this but the difference in design between the Stant and mazda thermostat is pretty noticeable. The previous thermostat that was in my system that i suspect failed looked just like the Stant i purchased so i figured the previous one was a mazda thermostat and it looked just like the stant so i figured it was fine, but i think i found the source of my problems, i ran the car without the thermostat and it ran a lil above the quartermark and when i got home i culd hear a little bubbling in the rad, but it didn't overheat at all. But i noticed with the stant installed the temps started to go right up, the mazda design is much smaller and its got this little dangling device on the ridge its hard to see from the pictures. I just figured i'd post this to those who think going with other brands besides OEM is ok (I once thought it was ok to go with other brands til now). By the way before anyone says get a new camera my mom had it, so i had to use my 1 year old cell phone camera, not bad for "old" technology, the mazda thermostat is the short one with the three bars over the top of it.

 

interesting, Ill write this for anyone who will be searching in the future:

overheating problems

there, now they can know to check their thermostat condition AND brand before posting.........*crossing fingers*

 

yeah, i had to call the mazda back to make sure i got the right parts number because the difference was so noticeable.

 

Some people hate stant and swear by oem...

 

OK **** stant, sorry for my language it has caused me to go through all sorts of things to see why my car was overheating, the original stant that was in there the previous owner installed failed, and so did the one hte woman at advance auto provided me with, she could have by chance provided me with the wrong thermostat, but who knows, but i popped in a good ol OEM thermostat and my overheating woes are GONE!!!

 

And the debate on running the car without the thermostat in well when i ran it without the Tstat the car ran a little over 1/4 mark maybe closer to 1/2, and drove for about 16 miles, and when i got home i culd hear bubbling in the rad and some noises. So i put a OEM one in and my needle stays at around 1/8- to 1/4 mark on the temp gauge, soo in my case running w out the tstat made me run warmer.

 

**** stant X2

they may work fine in other applications but can pop a motor in a rotary if you're not careful. aftermarket thermostats just don't work right in there, i have pulled out perfectly fine aftermarket thermostats that were causing overheating issues. i don't see anything wrong with that thermostat either, do you?

 

I used my autozone tstat till just today and the only reason for changing it was because I didn't want it in there anymore. I had no problems with it and it never let me down. Only part of my cooling system that sux is my 30amp relay for the efan. Funny you mention this today though cause I just got the new oem tstat today and rad cap

 

Copied to archive.

And people have been wondering why I have been claiming the Stant should never be used for the last 10 years. The Stant fits, but there is a difference between fitting and working.

Thanks for the pictures tjeter... pretty plain that the Stant also has a smaller opening in those pictures as well.

 

89-95

Mazdatrix
http://mazdatrix.com/b9.htm

Does it really matter what year thermostat I use?

 

Sucks to have an S5 then .

ALWAYS USE OEM THERMOSTATS. Sorry, this just isn't said enough. It has caused myself and others way too many easily avoidable headaches, hours and dollars.

IMO it should get a sticky. Title: "Make sure your FC has an OEM thermostat". The sticky can be blank for all I care.

 

I've always used Stant. Never had an issue with overhaeting in Houston, in the Summer at an Auto-x event. Stop and go traffic with the a/c on, 100+ deg temp. outside not a problem. That was with the old S4 engine and now with the S5 engine....not one single problem. But now I have a Flexlite fan and still the stock rad.

 

^ because you do not have the proper monitoring equipment to be able to tell what is realy going on. But hey if you like the wrong part go ahead and use it.

 

so what does that mean?
I have aftermarket water and oil temp gauges &
Microtech water temp.

and i say it again stant works great!

Also I ran the **** out of this car day in and day out. So i don't see the problem.

 

Is the OEM thermostat available in a 180, or metric equivilent?

 

Word.

For a gas cap, fine. Not for what's protecting my engine. To hell with that crap. I got my oem s4 from mazdatrix. Looks like for my s5 I'll go to mazda.

 

Out of curiosity, how stupid would it be to use an s4 therm in an s5? What's the temperature difference, and why?

 

First of all, I don't think it would be a physical fit.

Second of all, why whould you want to, when you can get the oem S5?

You can still get the oem tstat from Rotary Performance-RX7.com in Dallas, TX. The FC S5 and the FD use the same part number and they keep plenty of them in stock. I got mine there this month. The price was basically the same as buying a Stant. The stat that came out was oem and was working fine, but I replaced a broken thermostat housing and it was good to replace tstat while I had it apart.

 

I bought a OE stat from Mazda when I put my Koyo in. THe old one was OE. Wasn't bad but I figured I go with a new. I do the same with the oil filter. I'd rather give my money to Mazda.

 

+1

 

i asked because I accidentally bought two thems for my 88, which now lays broken and dormant. So I got an extra laying around. I haven't yet replaced the therm in my newly acquired 89. Just a stupid question, sorry.