Overheating

JAYTHOLEN

MEMBER
2004 HYUNDAI SONATA
6 CYL
2WD
AUTOMATIC
200,000 MILES

Overheating when idling and A/C starts blowing warm. Not steaming.
Changed thermostat, ran with A/C on 45 minutes. Ran cool, A/C fine.
Drove 20 miles, again overheating - A/C warm. Radiator fans both blowing (right one making noise). No leaks, top and bottom hoses both hot.

Wednesday, June 16th, 2021 AT 9:45 AM

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

Let's start with the overheating issue and then we can check the A/C for an issue. It may just has a weak charge but the overheating is clearly affecting it and it may be shutting the compressor off to keep it from overheating more.

https://www.2carpros.com/articles/engine-overheating-or-running-hot

https://www.2carpros.com/articles/symptoms-of-an-overheating-engine

I am concerned with the fan making noise but the fact that they are on is a good thing.

So let's check coolant level and then pressure check it just to make sure there are no leaks. I understand you see no external leaks but the pressure test will confirm this.

https://www.2carpros.com/articles/radiator-pressure-test

Let's start with this and go from there. Thanks

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Thursday, June 17th, 2021 AT 7:45 PM