Question about 1992 Mazda MX-3

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Mazda mystery overheating

Car over heated. Went with the cheap easy fix and changed out the thermostat. Then when that wasn't it we swapped out the water pump. That fixed it for a couple of months. When the cold weather hit we realized the heater core seemed to have gone out but before we could get around to it it over heated again. It has antifreeze, new thermostat, new water pump, ( new clutch, front axle shafts, and fuel relay). I'm DONE with this car and want to fix it and sell it but I'm a girl with little mechanical knowledge. =) I'm thinking 20 y/o car with little or no maintenance before I bought it last year, maybe it's got a blockage in the cooling system (either the radiator or heater coil?) Any trouble shooting would be great. I have spent more on this car in the last 5 months than I think I bought it for.

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It does sound like low maintenance, and too bad, yeah, somebody milked it for all it was worth, then passed it off to you as a "good car..."
What if the car costs more to fix than you could ever get out of a 20 year old car? If you needs an engine rebuilt, don't do it unless you want to keep the car, ...and milk it and.../no! you'd have to have a real attachment to this car to want to fix it big-time, For troubleshooting, bite the bullet, go to a shop and tell them to run their cheapest (sweet talk them, if you have to!) test to see if you got good compression in all cylinders, and you don't have a blown head gasket.

Posted on Jan 09, 2013

  • montehammons Jan 09, 2013

    I want to add, for your peace of mind, Ms., if your engine is good, anything else is crazy cheap, comparatively speaking. Radiators can be flushed and cleaned, new ones are relatively inexpensive, the few i've checked.


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Posted on Jan 02, 2017

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SOURCE: I think the water pump/thermostat

Not sure if there are two thermostats, I know of one that I changed, it sits right above the starter and right below your air box. I had the problem my guage was reading hot on a cool night so I went and popped the hood and (after cooled) opened the radiator resivoir and the results were dry as a bone. I had steam coming from the cap. if you so this be sure to slowly release the pressure from the red cap that reads HOT WARNING DO NOT REMOVE. that is where you pour the coolant/water mix.

After I did that I took it to a shop and had it flushed, cleansed and refilled.....then I was runnin a beutiful bright green. Cost about 69.99 for flush then I found out my water pump pully was locked up and not rotating (not pumping coolant). So I fixed that last night and she's runnin pretty good after 190,000 miles.

Good Luck Mazda's

Posted on May 13, 2009

  • 2309 Answers

SOURCE: I have a 1996 Mazda 626 2.0 Automatic. It runs

of course the top is hot water goes into the rad from the top and out of the bottom into the engine, the fact that the belt broke makes me wonder about the integrity of the water pump, the impeller might be slipping, could still be the rad , does the heat go from the top to the bottom???

Posted on May 11, 2010

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SOURCE: 1994 Mazda 626 ES overheating

New water pump.... new timing belt.... new radiator cap... but the idiot mechanic has not done the obvious.

1. Change the coolant thermostat located under the hose fitting on the manifold where the top radiator hose connects to the engine.

2. Check the radiator fan switch for proper operation. When in doubt change it out. A $30.00 switch isn't worth risking a complete engine overhall.

3. Do a compression check on the engine to make sure all cylinders have close to the same amount of comression. Overheating can cause head gaskets to weaken and fail. Performing the compression check would verify that both the cylinder head, valves and head gasket are still in good working order.

4. (Applicable only to cars with a belt driven fan) Does the fan have a fan clutch? I did not look it up yet. If it does then the fan clutch can also be a problem if it is not turning the fan when the engine is hot.

For cars with an electric fan the switch in step 2 applies as does checking the fan for proper operation.

5. Fire your mechanic! If there is one thing I hate it is a mechanic that only does half the job vs checking out all possible causes! Your car should have never left the shop in a state that it could over heat AGAIN. Time to have a chat with she service manager and the service managers' boss! They owe you some free labor!

Thanks for using FixYa.


Posted on Mar 10, 2010

  • 3911 Answers

SOURCE: I need to change out

you can buy a repair manual, specific to your car for about 10 bucks on ebay. you can get general directions on autozone website.

Posted on Dec 21, 2010

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SOURCE: Hello, I have a 1990 mazda mx5 1.6 which has just

If this problem sudenly happened? Its unlikely to be the radiator as it won`t sudenly block up.Also not likely to be water pump (unless its leaking, but that is something you would see) If your car has been runing at normal temp thermostat is ok.So i think the sender on the thermostat housing should be replaced and its an easy job to do.
The only other times when i have seen this problem is head gasket fault when the cooling system gets air in it and that air ends up in themostat housing so no coolant covering sender therefore giving a different reading
I hope i have been of some help to you

Posted on Feb 27, 2011

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