Hi and welcome to FixYa I am Kelly.
You have 2 fans because one is the temperature controlled radiator fan that only runs when the engine water temp is above 160 deg. F. The water termperature controlled fan can run even with the ignition key OFF should the Engine water temp be too hot.
The 2nd fan is for your Air-Conditioner that should run when the cabin temp is set low enough for the Air-Conditioner compressor to run. This fan should run anytime the Air-Conditoner is switched on.
If your experiencing engine over heat problems when driving slow or sitting idle most likely the fan switch that is switched on by water temperature has failed. The fan switch controls a fan relay and if the relay fails the fan will not run. In this particular model there is a cooling fan module that controls the fan.
Read this link but DO NOT click on any links from that webpage: (They do not work)
http://www.fixautopartz.com/2009/03/20/2003-mitsubishi-outlander-engine-cooling-system
Thanks for choosing FixYa,
Kelly
Those are your cooling fans for the radiator. One is used as primary and the other won't kick in till you run the ac or it gets hotter.
http://repairhelpcenter.blogspot.com/2011/11/engine-cooling-components-working.html
------------------
How does Vehicles Engine
cooling system works?
http://repairhelpcenter.blogspot.com/2011/11/how-does-vehicles-engine-cooling-system.html
------------How to Replace Engine cooling
Fan:--
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-engine-cooling-fan-on.html
-----------Replace Fan Relay but still
Radiator cooling fans not working?
http://schematicsdiagram.blogspot.com/2011/12/replace-fan-relay-but-still-radiator.html
----------DIC says "COOLING FAN
FAULT"?
http://schematicsdiagram.blogspot.com/2011/12/dic-says-cooling-fan-fault.html
---------Where Is Radiator Fan relay
and Fuse Located?
http://schematicsdiagram.blogspot.com/2011/12/where-is-radiator-fan-relay-and-fuse.html
--------
This will help.
Thanks.
For radiator replacement procedure and radiator problem troubleshooting. I suggest you to click the link below and follow the detailed procedure :-----
------------
How to Replace
Engine cooling Fan on car?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-engine-cooling-fan-on.html
------------
Engine makes noise and Cooling Fan belt Breaks?
http://howtobyme.blogspot.com/2011/12/engine-makes-noise-and-cooling-fan-belt.html
-----------
Replace Fan Relay
but still Radiator cooling fans not working?
http://schematicsdiagram.blogspot.com/2011/12/replace-fan-relay-but-still-radiator.html
--------
Cooling fan relays location?
http://technoanswers.blogspot.in/2012/02/cooling-fan-relays-location-on-1998.html----------DIC says
"COOLING FAN FAULT"?
http://schematicsdiagram.blogspot.com/2011/12/dic-says-cooling-fan-fault.html
------------
How to replace radiator Cooling Fan?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-cooling-fan-on-acura-car.html
---------------
Engine cooling
components working?
http://repairhelpcenter.blogspot.com/2011/11/engine-cooling-components-working.html
-------------
How does Vehicles
Engine cooling system works?
http://repairhelpcenter.blogspot.com/2011/11/how-does-vehicles-engine-cooling-system.html
----------
cooling fan not working
http://schematicsdiagram.blogspot.in/2012/02/hyundai-sonata-cooling-fan-not-working.html-----------
Fuel pump relay and
cooling fan relay troubleshooting?
http://repairhelpcenter.blogspot.com/2011/10/fuel-pump-relay-and-cooling-fan-relay.html
----------
Why Transmission fluid leaks near radiator?
http://repairhelpcenter.blogspot.in/2012/02/transmission-fluid-leaks-near-radiator.html
----------
Transmission fluid leaking?
http://technoanswers.blogspot.in/2012/02/ford-windstar-transmission-fluid.html
-------------
How to replace Radiator?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-radiator-on-audi-and-vw.html
----------
HOW TO REPLACE AN UPPER RADIATOR HOSE
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-upper-radiator-hose.html
------------
HOW TO REPLACE A LOWER RADIATOR HOSE
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-lower-radiator-hose.html
-------------
How to replace Radiator on Car models?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-radiator-on-acura-car.html
------------
How to flush cars radiator?
http://repairhelpcenter.blogspot.com/2011/11/how-to-flush-cars-radiator.html
--------
HOW TO PRESSURE TEST A RADIATOR AND CAP
http://schematicsdiagram.blogspot.com/2011/07/how-to-pressure-test-radiator-and-cap.html
----------------
HOW TO REPLACE A RADIATOR
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-radiator.html
------------------
HOW TO REPLACE A RADIATOR SUPPORT
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-radiator-support.html
-----------
This details will help.
Thanks.
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