For radiator replacement procedure and radiator problem troubleshooting. I suggest you to click the link below and follow the detailed procedure :-----
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How to Replace
Engine cooling Fan on car?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-engine-cooling-fan-on.html
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Engine makes noise and Cooling Fan belt Breaks?
http://howtobyme.blogspot.com/2011/12/engine-makes-noise-and-cooling-fan-belt.html
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Replace Fan Relay
but still Radiator cooling fans not working?
http://schematicsdiagram.blogspot.com/2011/12/replace-fan-relay-but-still-radiator.html
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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
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How to replace radiator Cooling Fan?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-cooling-fan-on-acura-car.html
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Engine cooling
components working?
http://repairhelpcenter.blogspot.com/2011/11/engine-cooling-components-working.html
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How does Vehicles
Engine cooling system works?
http://repairhelpcenter.blogspot.com/2011/11/how-does-vehicles-engine-cooling-system.html
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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
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Why Transmission fluid leaks near radiator?
http://repairhelpcenter.blogspot.in/2012/02/transmission-fluid-leaks-near-radiator.html
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Transmission fluid leaking?
http://technoanswers.blogspot.in/2012/02/ford-windstar-transmission-fluid.html
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How to replace Radiator?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-radiator-on-audi-and-vw.html
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HOW TO REPLACE AN UPPER RADIATOR HOSE
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-upper-radiator-hose.html
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HOW TO REPLACE A LOWER RADIATOR HOSE
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-lower-radiator-hose.html
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How to replace Radiator on Car models?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-radiator-on-acura-car.html
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How to flush cars radiator?
http://repairhelpcenter.blogspot.com/2011/11/how-to-flush-cars-radiator.html
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HOW TO PRESSURE TEST A RADIATOR AND CAP
http://schematicsdiagram.blogspot.com/2011/07/how-to-pressure-test-radiator-and-cap.html
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HOW TO REPLACE A RADIATOR
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-radiator.html
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HOW TO REPLACE A RADIATOR SUPPORT
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-radiator-support.html
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This details will help.
Thanks.
Trouble Code: P1491
You PCM does not sense current to radiator fan when it turns it on. Is the fan coming on or not? Usually not when you have this code. Problem can be with the fuse, relay, wiring or fan itself. First check the fuse. If good, next try swapping the relay with another one in the engine compartment relay box, such as the horn relay.
Let the car warm up and see if the fan will come on. If yes, get a new relay. If not, either use a test light to see if there is voltage at the fan connector when the engine is on and hot, or else test the fan motor by hotwiring it to the battery. If none of this works, please get back to me for how to troubleshoot the wiring.
Radiator Fan Control Relay Circuit Malfunction
Possible Causes:
Radiator fan control relay circuit is open or shorted to ground
Radiator fan control relay circuit is open (test power to IGN)
Radiator fan control relay is damaged or has failed
PCM has failed
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