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Old 08-02-2011, 05:13 PM   #1 (permalink)
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Default 1991 Miata overheating problem

my car overheats has some overheating problem. when i drive my car for a while it overheats but then when i turn on the ac so the other fan works it cools back down. i changed the thermostat. what else should i do?im replacing the primary fan because i think thats causing the cooling problem.
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Old 08-02-2011, 05:17 PM   #2 (permalink)
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Default Re: 1991 Miata overheating problem

clog in radiator
any coolant loss?
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Old 08-02-2011, 05:29 PM   #3 (permalink)
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Default Re: 1991 Miata overheating problem

Ya that sounds like a bad radiator, not doing its job and the second fan helping cool it down, if you have the stock radiator I'd bale on it any how that plastic bull shit explodes on all three NA's I've had around. If your on a budget do a CXRacing radiator come across them on ebay everyonce in a while brand new in the 100-150 range, alot of guys on here with boost applications run them so they stand up to the heat. GL with all
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Old 08-02-2011, 10:23 PM   #4 (permalink)
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Default Re: 1991 Miata overheating problem

Cxracing aluminum rad checking in and working great.

Does your rad pass the brown test? If not time to change it. When was the water pump last changed?
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Old 08-02-2011, 10:25 PM   #5 (permalink)
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Default Re: 1991 Miata overheating problem

It's obviously your primary fan not working. Check the thermoswitch on top of the thermostat housing
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Old 08-02-2011, 10:54 PM   #6 (permalink)
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Default Re: 1991 Miata overheating problem

Quote:
Originally Posted by imnatelol View Post
It's obviously your primary fan not working. Check the thermoswitch on top of the thermostat housing
+1. also go to the diagnostic box and jump TFA and GND and check to see that the fan itself is working properly. I once had the fan wiring backwards which caused it to blow through and not draw from outside which also caused some overheat problems
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Last edited by seraph; 08-21-2011 at 10:54 PM.
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Old 08-02-2011, 11:00 PM   #7 (permalink)
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Default Re: 1991 Miata overheating problem

I own a 90 and have that exact problem. My suggestions and also what i'll be doing is replacing the radiator, because i use the secondary fan to cool it down, and new heater hose to the firewall.

Hopefully you'll get your radiator sooner than I do and update us
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Old 08-03-2011, 02:41 AM   #8 (permalink)
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Default Re: 1991 Miata overheating problem

yeah i got another oem primary fan. for now its not overheating at all. i usually over heat going up hills for a long time. but now the temp barely went up i dont think it moved. i dont think i need to replace the water pump cause both hoses gets hot so im guessing my water pump is still good? but if it starts overheating again im prolly going to buy that cxracing.
and yes my primary fan works

thank you for your help!!
i just want to drive my car for like 100 miles without overheating and id be satisfied.
before this fan my temp would go over half almost to hot and i only traveled 4 miles -_-
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Old 05-31-2012, 02:47 PM   #9 (permalink)
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Default Re: 1991 Miata overheating problem

what size primary fan did you purchase cause i have the same problem i just dont know the size of the fan i need to get
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Old 05-31-2012, 03:10 PM   #10 (permalink)
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Quote:
Originally Posted by gl0v3r View Post
what size primary fan did you purchase cause i have the same problem i just dont know the size of the fan i need to get
There's only one size oem fan brosef
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Old 05-31-2012, 03:46 PM   #11 (permalink)
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Default Re: 1991 Miata overheating problem

Guess I'm just terrible at research cause I couldn't find what size I need I figured it would be 9" or10" diameter fan
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Old 08-11-2012, 05:43 PM   #12 (permalink)
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Default Re: 1991 Miata overheating problem

Buy my Flyin miata radiator with air flow kit!!! lol it has less than 5k miles
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Old 08-12-2012, 05:32 AM   #13 (permalink)
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Default Re: 1991 Miata overheating problem

^ Won't fix his issue.


Anyway, if your fan isn't kicking on, and you can't figure out the problem with someone there. Just wire up a switch and a hot wire from your ignition to your fan, and switch it on when deemed appropriate.
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Old 09-22-2012, 10:38 PM   #14 (permalink)
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Default Re: 1991 Miata overheating problem

i replaced the thermostat and got a Mishimoto aluminum
radiator and same thing happens
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Old 10-07-2012, 06:36 PM   #15 (permalink)
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Default Re: 1991 Miata overheating problem

I would start replacing parts in this order:
1) thermostat
2) radiator
3) pump
4) fans
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