Low temp thermostat - Mazda MX-6 Forum
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post #1 of 34 (permalink) Old 12-23-12, 11:45 Thread Starter
 
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Low temp thermostat

I've been having trouble with overheating and I think its the thermostat, I put one in the other day and it still over heats. Im gonna test the thermostat but I wanted to see if anyone knows of where I can get a lower temp thermostat? Maybe 170° or so. ..?
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post #2 of 34 (permalink) Old 12-23-12, 12:04

 
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When was the last time you flushed your rad? do you know for sure that your coolant is circulating?

Just an idea...

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post #3 of 34 (permalink) Old 12-23-12, 12:12 Thread Starter
 
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Well this is my problem. I've flushed the coolant about a month ago to get my right mixture. But every time the car runs hot, the upper Rad hose is hot but not my lower one. Its cold, along with the radiator. Makes me think that's it the thermostat sticking. Or the water pump...that's the last thing I wanna do. I've already been through 4 and only had the car for 13,000 miles lolol
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post #4 of 34 (permalink) Old 12-23-12, 12:21

 
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Good point about the thermostat

But Side question/thought. Why have you gone through so many water pumps? I'd start there. The typical water pump "should" last much longer than yours. I've not had to replace mine yet, and the car has 135000KM for milage

Do you have the right belt tension? I don't know about our cars, but on some cars its recommended to do a timing belt job when you do the water pump.

Again, just a thought - there has to be a good reason you're burning through water pumps.

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post #5 of 34 (permalink) Old 12-23-12, 12:30 Thread Starter
 
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Yeah on my first water pump job, I did the timing belt. Man its a b**** to get everything lined back up. But yeah I've always had good tension and my belts are very hardly used. But for some reason they all leak, I get them from autozone, but my last one I got from Mazda and its been good since then. Which was about 2500 miles ago.
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post #6 of 34 (permalink) Old 12-23-12, 12:32 Thread Starter
 
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I am getting a NB miata in the spring and I don't want to trade this car in but the way it's been acting lately, its almost inevitable. Ive had it for 3 years now and its been reliable for the most part. Other than waterpumps and distributors. I've been. Through 5 of those!
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post #7 of 34 (permalink) Old 12-23-12, 23:46

 
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If you want to run cooler, you need a hotter thermostat. You want coolant staying in the radiator longer. With a cooler thermostat, your coolant won't get a chance to cool, causing you to overheat and your thermostat will not close.

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post #8 of 34 (permalink) Old 12-24-12, 23:11
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Stant 48478 exact thermostat
Stant 14047 this is a 170 degrees thermostat,

amazon.com 15.92
ebay 11.99
etc.

do you check for leaks?
do you purge cooling system?
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post #9 of 34 (permalink) Old 12-24-12, 23:54 Thread Starter
 
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Yeah let me give you guys some background info. My waterpump is less than 2,000 miles old, radiator is maybe 2 years old. When I replaced my Rad I did the hoses too. My thermostat wasn't changed though, I changed it out and now its still over heating. I check for leaks every time I drive. (Yeah I'm very anal about it leaking anything at all.) So I'm gonna go through and get all distilled water and some water wetter, and bleed me system and get my right mixture when I can. Probably next week. Ill order another thermostat also just to be sure. Thanks a bunch folks!
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post #10 of 34 (permalink) Old 12-25-12, 2:21

 
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Get a hotter rated thermostat or you're going to continue to have problems

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post #11 of 34 (permalink) Old 12-25-12, 12:18 Thread Starter
 
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Im trying to visualize how a hotter thermostat will make my motor run hotter. It seems like the water that is in the motor would get hotter than it needs to because there isn't any flow. I can see that the longer its in the Rad the colder it will be but it seems like the water from the motor is hot enough to cancel that out
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post #12 of 34 (permalink) Old 12-25-12, 12:56

 
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Garage
Our cars are supposed to have 2 stage thermostats if I remeber correctly. Id look into a stock one if you havent replaced it then start there. Just my 2 cents.... peanut gallery out

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post #13 of 34 (permalink) Old 12-25-12, 13:30 Thread Starter
 
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Might pick up one from Mazda to be sure. The opening temp is at 185 I believe? Is that right?
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post #14 of 34 (permalink) Old 12-25-12, 13:37
 
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Zach is wrong about using a hotter thermostat. No point in having the water staying in the radiator getting cooler if it isn't flowing through the engine anyway. The idea of different temperatures is to control when the thermostat opens to start the heat transfer, due to differing transfer rates with external temperature.

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post #15 of 34 (permalink) Old 12-25-12, 15:42 Thread Starter
 
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I meant run cooler* on my other post lol
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