So I have been overheating it has been about 100 every day. I have put in a new water pump, thermostat, mishimoto radiator and fans and cap. Also I am running 90/10 water/anitfreeze ratio. What am I forgetting?

 

Put the undertray back on.

Dann

 

Are you losing coolant? Is it overheating when stopped or driving? Is your fan coming on?

 

All fans are good and im not loosing any coolant. Runs at about 195-200F at a sitting still with ac on. Under boost or at speeds at 60-70 the car gets to 230F and will keep increasing if I were to let it. I ordered an undertray and and new temp sensor. If that dont fix it I am completely at a loss of what to do. I understand a coolant re route helps but I am not even driving the car hard and it overheats.

 

have you bled all of the air out of the system?

 

If you just "ordered an undertray", am I correct to assume that you don't yet understand the concept of "ducting"?

 

OP, you realise that with no further info except that you dont know why it overheats and that it does infact overheat, I was able to deduct that you were infact missing the undertray, immediately, with no hesitation and full confidence.

If someone can do that, whats the chances that they are right?

Dann

 

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Yes I bled all the air

 

I understand I just didn't realize how crucial it was on a street used miata. Sometimes it over heats just going 40mph or les. Didnt think ducting would be so crucial as to lower 230f temps at such low speeds.

 

You may have other issues. But it's a given that you need to use the under panel.

 

I don't understand what other issues I could have I figure underpanel and I ordered a new temp sensor. Replaced everything else.

 

Air in system?

nm see you said you bled the system.

I'm willing to bet the panel fixes it. You would be surprised how much of an impact it has.

 

Make sure your fans are rotating in the correct direction and get more water into the mix.

 

How did you burp the coolant? I would suggest going on amazon and getting one of the magic funnels to use for burping.

 

I followed the same procedure similar to that of the mishimoto YouTube instruction video for installing the radiator.

 

Fans are good. Is it safe to run less than 10% antifreeze. Oh also I forgot to mention that I tried wetter water and it didn't really do much. I did wetter water and water mix.

 

I started thinking would the panel also help at idle as well? Maybe act similar to sucking through a straw? Increase air velocity by allowing the fans to pull air better?

 

How are your fans mounted to the radiator?

 

I would suggest putting the undertray back on, since it's the only suggestion in this thread that's going to actually fix your problem.