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Overheating when the A/C is on

Tiny
GIOVANNIL
  • MEMBER
  • 2003 HYUNDAI ELANTRA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 70,000 MILES
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
Saturday, July 8th, 2017 AT 1:45 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
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
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Monday, July 10th, 2017 AT 11:55 AM

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