Det kan mycket väl ha orsakat din överhettning om kylsystemet fått in luft..
Radiator Cap
The OEM cap’s positive pressure valve should hold closed until at least 11 psi and not more than 15 psi pressure. The negative pressure valve should be easily opened with two fingers and should seal closed when released.
Coolant Reservoir
This tank connects to the radiator at the cap, just above the positive pressure valve. The tank is not under radiator pressure. It should be sufficiently full to
allow coolant to be sucked back into the radiator as it cools off. If air is sucked in instead of coolant, it will expand in the cooling system as the engine warms up, and will result in air and coolant being expelled back into the reservoir if the pressure is over 15 psi.
The small tube from the reservoir input to the bottom of the tank sometimes gets clogged with rust or other deposits from the cooling system. It should be cleaned for good operation of the system.
The other tube from the reservoir is an overflow to vent excess air and coolant. If the hoses are removed from the reservoir cap, be sure to reassemble with the cap’s yellow tab pointing toward the rear of the engine; the long tube connects to the radiator hose.
Allt om Miatans kylning...
http://www.miata.net/garage/CoolingSystemProblems.html
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