I just replaced my fan clutch on my '91 XLT (4.0 V6 EFI) with one that I got from Auto Zone's online store. It looks exactly like the OEM Ford part but it makes a loud whining noise when I accelerate. It says "Made in China." The description was "heavy duty for fast revving engines" or something to that effect. Since the fan clutches are thermostatically controlled I expect it to engage when the engine is hot and disengage when it cools off some. I'm not certain but it seems to engage when the engine is running faster and disengages when it's running slower. Is there some way to test this thing to make sure it's working right? It feels tighter than the old one which rotated easily when the engine was hot and off. The new clutch
*seems* to be working great as my overheating problem is gone and the cooling systems seems to be operating exactly like it should, but the fan is rather loud and annoying. I also replaced the fan blade recently (before the new clutch) and it looks exactly like the old fan and I got it from Ford. It also looks like I put it on the right way. It was not whining with the old clutch.I could probably take it back to any Auto Zone store and get one from Ford if need be. Anyone else with this problem?
Thanks.