Question about 1995 Jeep Grand Cherokee
Got a whining noise only on first start up when it is cold. only in morning hours and the whining goes away after it warms up some.
The fan is bolted to a viscous fan hub. It is designed to have silicone fluid in one half of the hub and when the engine starts cold it locks up and drives the fan until the fluid is pumped back to the other side or reservoir in the hub. It is held there and the fan now spins free When the radiator gets hot there is a bi-metallic strip that holds a valve cluse and this strip bends and allows the valve to open and the fluid is thrown by centrificale force back into the front section and the fan is then jammed because it gets more than it can pump back to the reservoir. The fan spins and draws air through the radiator and cools the coolant down. As the coolant cools down so the metal strip closes off the valve and the fan eventually free wheels again until the next stop where the action is repeated. . If your car has one of these hubs and it tends to over heat when stopped then the hub is the main cause and should be changed. The noise is the fan spinning until the fluid is moved out of the front section
Posted on Jan 01, 2014
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Posted on Jan 02, 2017
SOURCE: Whining Noise
Hi, this sound is most likely coming from the power steering pump. I would first, check the power steering fluid level to see if it is full. if its not at the full mark, add some fluid. If the fluid reservoir is full upon inspection and the whining continues, the pump may be damaged and the pulley on the power steering pump could be slightly out of sync with the pump housing.
The second issue could be belt slippage. i would do a tension check on the drive belt and pulleys as well. make sure there isn't any ware and tare on the belt and make sure the tension is to specs.
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Posted on Apr 15, 2009
I have the same model Grand Cherokee Limited 5.2L V8, nice truck; for fuse panel description and locations, check page 7 and next. All the infor that you need is here: Jeep-ZJ-Grand Cherokee-Secc-8W-Wiring-Diagrams.
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Posted on Aug 22, 2012
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