I have replaced the thermostat but the problem still is present. When i drive my car it gets up to normal temp and holds for minute or so and then my fan begins to wine loudly and then my engine temp gauge begins to raise. So i turn on my heater up and blow hot air through my vents and the gauge returns to the normal position. My fan still wines but as long as my heat is running the temp stays normal. So i can turn my car off for a couple of seconds and then start it again and my fan no longer wines and my care runs perfectly normal. what could be the problem. the repair shop says the water pump and radiator are fine.
Overheating Due to corrosion block in Water Pump on Erratic engine coolant temperature or intermittent overheating can be caused by corrosion inside the water pump. ...Either condition reduces coolant circulation resulting in engine overheating.
SOURCE: 2002 Lincoln LS overheating
The cooling fan on the LS-V8 is hydraulic yes. But it also has a pressure switch on the pump that drives the fan. It is controlled by the temperature sensor. All these things must be taken into account. But the whining sound my lead me to believe that the pump is either low on fluid or is wearing out. The fluid the fan pump uses is the same as the power steering pump container so check it first. The same thing happened to my wife's Lincoln. I replaced the fan as well because everybody told me to do that but it didn't work. I found out that the fan is just a hydraulic motor in reverse it only spins as fast as the pump makes it spin and that is controlled by the temp. sensors. When the engine get's hotter the pressure goes up and the fan spins faster. This adds more power to the engine when it's running cooler because the fan doesn't have to spin at max speed. So good luck. I hope this has solved your problem.
SOURCE: my 2001 lincoln ls v6, the heater works fine
It's possible the cooling system is just a little low on coolant. There could also be a valve in the heater hose that is failing to open and let the coolant flow through the heater core. It could also be the heater core itself. Did it start doing this gradually or did start all at once? If it came on gradually it most likely the heater core or low coolant, if it happened suddenly it's a valving or heater control problem. Good Luck.
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