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I don't think it's the water pump. First off the car only has 22k miles on it. Secondly I took a trip last weekend, driving over 300 miles in it, and other then the noise it was fine. If there was a problem with the pump I'm sure it would have gone into limp mode by now.
Also, like the original poster, if I turn the car on for the first time that day, just sitting in my garage with an ambient temp of 70F, the fan will start running at full speed within a few seconds if the A/C is on. But as soon as I turn off the A/C the fan quiets down after a few seconds. Then if I turn it back on the fan starts running at full speed again.
So whatever this is does not seem to be tied directly to the actual temp of the car. It seems to be getting some sort of signal from the A/C that's telling it to run full speed like that. Perhaps a problem with the thermostat? Is there a special temp sensor that only gets checked when the A/C is running?
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