Question about 2005 Hyundai Sonata

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Sonata high temperature

2005 Sonata GLS, 6 cyl.

I had the thermostat replaced twice but water temperature immediately rises (almost red-lines) when I turn on the air-conditioner. Immediately cools when turned off. Temperature is always constant when air is not on.

The car doesn't smell like it is overheating ?!?!?!?! Hoses are somewhat soft.

Could the problem be the temperature coolant sender and/or sensor????

Or, is it more likely the water pump?????

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  • fjk_49 May 21, 2009

    When I turn on the AC fan, the temp indicator goes high. When I turn OFF the fan, it drops. The engine does not appear to be heating up. Help!

  • Robert Heeg
    Robert Heeg Jun 29, 2013

    I have the same problem change thermostat.I used the obd2 pocket scaner.No codes came up.But when it hot the engine fan is not on.

  • Anonymous Mar 30, 2014

    how do you replace a temperature sending unit for the coolant on a 2003 2.4 liter Sonata

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What type of sensor? I mentioned that to this machanic he argued with me that there's no way.

Posted on Dec 07, 2014

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Could be a bad sensor. I've seen this caused by a loose connection and may not be overheating in fact. Certainly should be checked out.

Posted on Nov 16, 2008

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