Question about 2005 Hyundai Elantra

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Over heating The car boils over when the air conditioner is switched on. A new fan has been fitted. Both fans dont seem to switch into run when the temp is high.

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Have you tried replacing the thermostat?

Posted on Jul 28, 2009

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My suspicion is that the fans may be coming on but they are not picking up speed when you turn on the A/C. Your car would have some of relay to control the speed of the fan whenever the A/C was turned on. This relay system would also increase the speed at which the fans run when the engine heat turns them on too.

Try starting the car cold and turning on the A/C right. Even though the engine is cold the rad fan should start up when you switch on the A/C. Once the engine gets hot the fan speed should increase accordingly when you switch on the A/C.

I'm not familiar with how Chrysler makes this work so I'm unsure what to repair but this is most likely your problem. Hope this helps.

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Why there are 02 fans near radiator? What are the purposes? One is working and one is not.


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

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get a NEW fan, they are all pretty much the same, on eBay or a parts store. sits right above the passenger's feet in an upside down attitude. 3 or 4 screws lower it after disconnecting the wiring. gently stick a running vacuum hose up in the hole and swish it around a few times before putting the new one in. if that did not do it the switch is next. if it is the switch generally you will note some slow deterioration in its function over time. generally the fan as it is an electric motor.

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The fans must come on before everything starts boiling. Is there another temp sensor besides the one you replaced? Did you replace it with a switch type rather than a thermal resistor type. The temp sensor should tell the computer to turn on the fans and the computer is supposed to turn on the fan relay and it turns on the fans. If they work with the A/C, that eliminates the computer output, the relay and the fans, and gets back to the temperature sensor.

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