Overheating when the a/c is on

2003 HYUNDAI ELANTRA
70,000 MILES • 4 CYL • FWD • AUTOMATIC
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GIOVANNIL
  • MEMBER
  • 1 POST
When you are sitting at idle with the AC on it does not overheat. It starts to overheat when you're around freeway speeds only with the AC on. I have replaced the hoses the thermostat and belts. Any help on what would cause this
Jul 8, 2017 at 1:45 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,837 POSTS
  • ASE Certified Mechanic
Hello,

It sounds like you have a radiator that is plugged either internally or externally, here is a guide that will help you get the problem fixed.

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

If the radiator checks out then my next test would be for a blown head gasket.

https://www.2carpros.com/articles/head-gasket-blown-test

Please run some tests and get back to us we are interested to see what it is.

Cheers, Ken
Jul 10, 2017 at 11:55 AM
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