I have a 95 thunderbird, the vehicle runs fine and i hadnt had any problems until one day the radiator fan wouldnt turn off, it drains the battery becasue it continues to run even after the engine is turned off and the keys are removed, ive been forced to unplug the fan every time i park, and plug it back in to drive

Remove radiator cap.Remove radiator bung from bottom of radiator and drain into container.Replace bung.Replace new 50/50 water/antifreeze mix.Turn interior heater up to max with fan on lowest setting.Run vehicle until hot, topping up radiator as required.Replace radiator cap when bubbling ceases. Road test vehicle, return and recheck level after cooling down period.Recheck level over the next few days and check for any new signs of leakage in system.(Fresh introduction of antifreeze can reduce the tension of the water molecules and can produce new leaks)

Check the battery voltage when the vehicle running on idle, it must between 13-15 volt.
Check the battery voltage on full electricity load (turn on headlight, A/C, radio, wiper), it must between 12,6-13,8 V, If the voltage under 12V, check the radiator fan and radio/power amplier

Many cars have this feature. The fan will run for a few minutes at a time until the coolant in the radiator drops below a certain temperature. Most vehicles with this feature will have a warning label on the radiator shroud indicating that the fan may start without warning when the engine or radiator is still hot. The only time you would need to be concerned would be if the fan continues to run without turning itself off, and causing the battery to be drained.

Radiator Aluminum Core, Crossflow — 3.8L (Base) and 4.6L Engines
Removal

1. Drain engine cooling system as described. Disconnect upper radiator hose (8260) and lower radiator hose (8286) and radiator overflow hose (8075) from the radiator (8005). Disconnect the transmission oil cooler inlet and outlet lines from the radiator.
   

1. Remove cooling fan motor,fan blade (8600) and fan shroud (8146) assembly as described.
   

1. Remove radiator upper bracket retaining bolts and remove bracket. Lift radiator from vehicle.
   

Installation

1. Position the radiator into the vehicle. Install upper brackets and tighten bolts securely.
   

1. Connect the transmission oil cooler lines to the transmission oil cooler fittings.
   

1. Install cooling fan motor, fan blade and fan shroud assembly as described.
   

Engine Cooling Fan Motor, Fan Blade and Fan Shroud Assembly, Electrical Removal

1. Disconnect (pull apart) the male-female cooling fan motor wiring connector at the side of the fan shroud (8146). Remove the male terminal connector retaining clip from the fan shroud mounting tab.
   

1. Remove two fan shroud upper retaining bolts at the radiator tanks.
   

1. Lift cooling fan motor/fan blade (8600)/fan shroud assembly past radiator (8005), disengaging fan shroud from two lower retaining clips.
   

Installation

1. Follow removal procedure in reverse order.
   

1. Tighten fan shroud retaining bolts to 5.2-7.2 Nm (46-63 lb-in).
   
   

HOPE THIS HELPS.

If the engine is turning over and it still wont start try shooting a little starting fluid in the air cleaner to see if it will run .. if so your fuel pump is either bad or the fuel filter is getting dirty.. thanks and holler if you need more Jerry

This is caused by the PCM not powering up. I would replace the PCM power relay in the battery junction box(fuse box under hood).

Hi Jeepers,

The fan will occassionally continue to run for five or ten minutes after the vehicle shuts down. This is normal.

What is not normal is if it keeps running until the battery drains.

Does it just keep running?
If it eventually shuts off, how long does it take?
Did this just start happening?
The two days you mentioned, were they short trips, opposed to the third day?

If you would comment me back with some more details, it would help me help you.

Mike

Your crank sensor may be really dirty and can't get a good signal from the reluctor near the balancer. Check the wiring harness to it as well. You may need a new crank sensor.

You may have air trapped in the cooling system, this causes a hot spot and the fans run, This is a common issue on most front wheel cars, jack the front of the car up as high as you can, fill the coolant reservoir full, run the engine until hot,( don't overheat it) then shut down, let the engine cool, this should self bleed the air, refill the coolant bottle and retest for your problem, restore the wiring, the not running fan is for AC. Spray cold water from a hose on the radiator his will help get the air out after the shut down.