2007 MX5, does not overheat and runs fine, cannot find a leak any wheres but every few weeks all the radiator fluid is on the ground.

Asked by Aug 06, 2015 at 04:24 PM about the Mazda MX-5 Miata

Question type: Maintenance & Repair

2007 auto MX5 grand touring power top. Runs great, does not overheat .cannot find a leak in cooling system any where. every few weeks all the radiator fluid in the reservoir runs out, apparently thru the overflow hose. no indication of loss of fluid until this event happens. 105,000 miles.

4 Answers

58,235

This is a sign of a bad theromstat,

31,375

Bad thermostat or a faulty pressure cap.

31,375

Could also be a head gasket leaking into the cooling system overpressuring the reservoir causing coolant loss.

how would you know the difference between the bad head gasket and a bad thermostat. I do not see any type of oily concatenation in the fluid. is it common for a thermostat to be bad on a 2007 with 104,000 miles. thanks so much for your help.

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