2002 vdp s/c started to make a loud humming sound and when i cut the car off it sounds like a airplane shutting down..any ideals

 

Faulty electric cooling fan(s)?????????????????????????

bob gauff

 

Do I need to replace cooling fan

 

Does this happen every time you turn off the car? Is the sound on the inside or outside?

If you turn the car off, while the fans are on, it will turn off like it is whining down. If it is doing it all the time, check your coolant levels, maybe it overheating.

When car is cold, pop the hood, start the car and look to see if the fan come on. If they do and its cold you have a open circuit = faulty fan (s) or temperture switch.

It might sounds good to have the fan on constantly, but the car will never reach operation temp, bad for gas mileage and performance.

SGB

 

So sgb what will I need to replace fans

 

I can't give you a direct answer, because I am not there, but I can give you some pointers on what to do.

Two test procedures, first would be the professional way and second would be the side street mechanics way.

If you know how to use a ohmmeter, you can pull the sensor and read the resistance value. I do not know the values of Jaguar sensors, since I am just starting with the Jag myself. But, this type of testing is universal through out the auto industry. A good scan tool can also read the sensors, while the car is running

The side street mechanic way, when the car is cold. Find the temp sensor(s), then start the car, if the fans comes on, pull the plug off one sensor at a time. If the fans stop running, then mostly thats the sensor that need to be replace. This a 50/50 chance, if the sensor are like $20 or less, then it would not be a big loss. But, I wouldn't do that with a $20.00+ sensor.

 

To counteract the increase in engine coolant
temperature that occurs after the engine stops,
at ignition off:

• if the fans are already on, the ECM keeps
them on for 5 minutes, or until the ECT
decreases to a pre-determined value,
whichever occurs first

• if the fans are off, the ECM determines, from
ECT and intake air temperature inputs, if the
fans need to be switched on. If they do, it
switches them on for 5 minutes, or until the
ECT decreases to a pre-determined value,

whichever occurs first.