cooling fans

[Lil bastard]

Yes, checking the radiators at least bi-annually s/b considered scheduled maintenance for these cars.

But I suspect that if that were the issue here, he'd see an abnormal Temp gauge reading which wasn't reported.

I think it's an electrical issue and not temp related.

One other thing - best to address this sooner rather than later to avoid possibly discharging the battery and create possible charging problems, now or in the near future.

[rgriffin]

I notice a similar thing. The fan I hear is behind the passenger seat somewhere.
I used to notice that it would come on periodically, but now it sounds louder and makes an almost grinding noise as it starts up. What fan is this, and what could be going on?

[Lil bastard]

That's the engine bay cooling fan. It should trigger once the temp in the engine bay reaches 180° F. It is not part of the engine cooling system. It's function is to reduce heat in the engine bay to prevent the charge from being too hot and to reduce the threat of fire - a concern for all mid-engine cars. You won't notice it when driving usually because sufficient air is drawn in the passenger side vent to keep the engine bay temps lower than 180, but idling, or in stop&go traffic, it should come on.

From your description, it sounds as if you have a bearing going bad in the fan motor. Plan on replacement sooner rather than later I'm afraid.

[lawn1]

Hi, Does anyone know if both fans should run at same time with only engine running and A/C off ? Only the left fan runs at low speed with engine running. If I turn a/c on both fans run at high speed. 1999 Boxster