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It could be more than one problem. The cooling fan could be running because the temp sensor is sending the wrong signal to the computer. The ac compressor or clutch could be bad causing a heavy load on the belt and the engine. I would unplug the compressor clutch and see if the engine still bogs down with the ac engaged.
this is normal for most vehicles, it is because the water temp in radiator continues to rise after you shut the engine off. would not worry about it unless it dose not shut off at all. or never runs
The fan should continue to run until the coolant reaches the shut-down temperature as determined by a sensor. Check the coolant level, is the van running hotter than it used to? A radiator flush may resolve the problem as build-up in the system can coat the sensor, preventing it from operating correctly.
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.
Many cars have an electric fan that will run on after the car has stopped. This is because the thermostatic switch is still hot to allow the fan to shut down. Often the thermostatic switch is set into the engine block but the fan only cools the water in the radiator. Only when the engine block has cooled will the fan shut off and this can take some minutes
Some cars are designed to have the fan run for a few minutes after you
turn the car off. But if doesn't stop until the battery drains, then it
might be a faulty switch or temperature sensor.
Or, if the fan stays running when the engine and radiator are cool you have a
very cheap problem: The fan thermostat is stuck closed. A new
thermostat will fix the problem--the hardest part of replacing it is
finding it. Follow the wires from the fan to the switch--it is usually
on the bottom tank of the radiator. Drain the radiator first and save
the coolant to put back in after you replace the thermostat. NEVER OPEN A
HOT RADIATOR.
If that wasn't it then check the following:
Check
to see that your coolant level is correct. Top up as necessary.
Lay
your hand on the radiator (with the engine off) and feel if it is as
hot at the top as it is at the bottom. If not, your radiator may be
clogged and need flushed or replaced. (Flushing is cheap. Replacing the
radiator isn't)
Do you get heat from the heater? Leave it
turned on high and see if your fan stays running the next time. If it
takes care of the problem that could mean you have a kinked radiator
hose.
Hope this helped (remember comment and rated this).
The car has a computer that is linked to the engine. It is hard wired to it meaning the computer is always on. Upon shutting your engine off taking the keys in hand the computer is still on sensing the engines temperture. The coolant sensor will send power to the relay to keep the fans running untill cooled down enough. Then the sensor will cut off power to the relay shutting off the fans
Is this the radiator fan you're talking about? If so it's supposed to run after the engine is switched off unitl it cools down. More noticeable on hot days.
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.
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