Overheating

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Overheating

Postby magick » Wed Jul 14, 2010 9:33 am

Hi I live in Las Vegas with my 2001 Miata. Have replaced the radiator, thermostat, water pump and it stile overheats after about a mile with the a/c on. Any ideas would be greatly appreciated.
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Re: Overheating

Postby Brian » Wed Jul 14, 2010 10:00 am

Any chance your Miata is lacking the under tray? Do we know if the fans are working? In particular there is a second fan that should come one with the A/C....is that fan coming on?
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Re: Overheating

Postby magick » Wed Jul 14, 2010 10:51 am

Not sure about either - how do I check?? Sorry I'm a blonde!!!
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Re: Overheating

Postby Brian » Wed Jul 14, 2010 4:54 pm

These things are designed with a big plastic undertray. It covers the whole underside of the front. If you look under the nose of your miata (not through the nose but under it), can you see a black plastic tray covering the entire underside of the front end of the car (from roughly windshield forward on the bottom). ?

Another issue is the fans....you have two fans on back of your radiator. You want to determine if both are running. With car hot, turn on the A/C while parked with the hood up...you should quickly see both fans at back of radiator running. If not, might be dead fan motor or relay, fuse, etc.
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Re: Overheating

Postby magick » Thu Jul 15, 2010 9:16 am

Yes I have the tray and yes both fans are running - where now? Got my O2 sensors yesterday - thanks.
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Re: Overheating

Postby Brian » Thu Jul 15, 2010 9:31 am

Well, if you didn't already replace rad we would talk about going to bigger 37mm rad....the stock size just may not be up to handling your Vegas heat. But there are some tricks that can be done to increase efficiency. One is to seal off space around rad so that all air coming through the nose is forced through the rad...instead of some sneaking over it. You can start with something like this....notice two versions depending on year that you have.

http://www.good-win-racing.com/Mazda-Pe ... -1033.html
http://www.good-win-racing.com/Mazda-Pe ... -1032.html
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Re: Overheating

Postby magick » Fri Jul 16, 2010 2:39 pm

Ok Brian I am going crazy - apparently my radiator was changed to a better one - not a bigger one. Someone else is telling me my thermostat is the wrong one, because it overheats within a mile. Than someone says I need bigger fans. I have dumped a lot of money into saving my car because I love it - but I cant drive around with the heater on so it wont overheat. Its 115 in lovely Vegas today!!! I appreciate all of your help.
magick
 
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Re: Overheating

Postby Brian » Fri Jul 16, 2010 3:37 pm

Sorry, very true that Thermostat is a possible cause....but you would need a mechanic to check it out.
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