You've probably seen this, most everybody with a Miata knows about this
site. In case you haven't, this is their cooling system page:

http://www.miata.net/garage/CoolingSystemProblems.html

Bob

On Wed, 15 Jun 2011 20:36 -0600, "YES NOPE9" wrote:
> gradually overheats on long drive
> no coolant is missing
> fan belt is quiet ... does not appear to be slipping
> turning on interior heater with fan brings temp down
> ( i have only seen water pumps fail by leaking and screeching )
>=20
> What might it be ?   How can I test ?
> 99guspuppet

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