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Question posted by mkmce on August 7th, 2012

2004 Soanata - Overheating With A/c On

Sonata 2004 - overheating with A/C on but A/C still seems to work fine. Temp guage went up to red so we stopped to let car cool and turned off A/C for journey. With A/C off temp was normal. Any idea of what problem is indicated?

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Answer #1: Posted by roadrunnertim on August 7th, 2012 6:43 PM

This answer was accepted by the poster of the original question.

roadrunnertim

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May 9th, 2012

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Flush your radiator and replace the thermostat at the same time. Either the coolant is weak or the radiator is partially plugged. The added strain of the A/C running is making the car overheat.

You could also check out the A/C condenser in front of the radiator. It looks like a miniature radiator. Clear out all the bugs, dirt and grime that accumulates in the condenser. That may solve the problem, but I would flush the radiator anyway. If you car overheats too many times, you will do damage to the engine.

Answer #2: Posted by philliprobinson on November 5th, 2012 4:21 PM

philliprobinson

Member since:
November 5th, 2012

Points: 100

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The model has 2 engine cooling fans, "LO" and "HI." The LO fan comes on when the engine reaches normal operating temp. The HI fan comes on when the A/C is turned on. If not the engine temp will go high especially while stopped or stop/go driving. Most likely the HI fan motor has failed (more expensive}, or the HI fan relay has failed {less expensive}.

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