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The hydraulic fan pump on my 2001 LS V8 has been making a whining noise for the past few months. I think I need to replace it soon. Where can I buy the pump and how hard is it to replace? There doesn't look like much space to work around the pump.

My fan stays running at the same speed all the time even from initial start up. If I use my A/C the engine will overheat. I checked several times to see if the fan runs faster when the A/C is turned on, but it doesn't. The pump for the fan makes a little noise but I'm not sure if that is the...