Mazda MX5/Miata NC Mk3 - Maintenance Episode 13 - Thermostat & Coolant Change

[@ogre706]

Amazingly helpful video, thank you. Haven't had to change my thermostat yet thankfully, but when it comes time to do so this video will be invaluable.

[@iainrutherford184]

Did mine yesterday. Took forever due to inclement weather and Mr Sausage Fingers coming to town... the thermostat bolts weren't the easiest to remove/replace, but the grease in the socket tip worked well. Thank you once again for a very useful and informative post.

[@CompletelyDriven]

I'm glad the video are helping.

[@Gord19]

Thanks for posting nice work greetings from Canada 🇨🇦

[@mnap89]

Are you sure expansion tank should be full all the way to the top? I think there should be some room for fluid expansion otherwise it may blow off the cap.

[@CompletelyDriven]

@mnap89 for the ease of bleeding you get the water level above the highest part of the system. You can take some out after if you want to.

[@magvegas]

Unless the mk3.7 or what ever u have, changed the specifications in the later models but I know for a fact the NC used special Mazda FL22 coolant that’s green, I strongly suggest you double check cuz I know for a fact red coolant will fk something up

[@CompletelyDriven]

Thanks for heads up. You are right, but the GL12+ is also free of silicates and is based on ethylene glycol. I will add the FL22 info to details.

[@tudor3874]

Can you replace all the coolant without removing the thermostat? And how much coolant came out of the radiator?

[@iainrutherford184]

Another great video. Very informative. Can I ask if you have replaced your throttle housing gasket, and if so, Mazda or Ford item? I understand that a Ford ST or RS gasket will fit and is about a third of the cost. Thanks for the share.

[@CompletelyDriven]

Hi. I just cleaned the rubber gasket between the throttle body and intake. Unfortunately I can't help you further

[@iainrutherford184]

@@CompletelyDriven that's perfect. Thank you 😊

[@katywalker8322]

Wish I had thought to use grease on the socket when I changed the 'stat on mine. Mine bled through easily (but is standard). My previous NC was a very early one. On these there was an issue where a minor air lock could appear when parked. Park pointing down hill and you had no heater irrespective of engine temperature until you had got the revs high for a bit. Think Mazda changed the routing of one of the cooling system hoses to fix this (possibly done as a recall in some markets)