Mazda Repair Questions? Ask Mechanics for Answers ASAP
Welcome, I'm Chris (aka Moose).
If there is no leak onto the ground then the coolant is being lost when overheating from overflow or it is being consumed inside the engine. The coolant would have to be very low like a gallon low to be the blame for overheating. It sounds like it was not that low, so the loss is not the cause of running hot. That is going to be a cooling fan not working, thermostat sticking, water pump impellers worn, or a internal engine issue that is packing air into the cooling system, preventing the coolant from flowing. Can you run a compression and cooling system pressure test to see if they are low or leaking down?
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Yes you can do those if you have the tools to do so.
Yes you can remove and leave out the thermostat though that can lead to the engine running poor as well as lead to it running hot because there is no pause in the coolant flow allowing it to cool off in the radiator with it constantly flowing. No special tools are needed to replace a thermostat.
Hello again Chris here,
I am contacting you because the post has not been closed or rated. We have 7 days to get a post rated before it times out. When a post times out, that means its no longer on my active list (if you reply I never know it.) You have already paid the fees to get this question answered, but it appears you're not pleased, or need more help.
Let me help some more. Is there anything else you feel I could offer so you would be pleased with my help. I have the option to call you if that would be better.