Car overheats only when AC is on.

[SeR_Cyclops]

Like the Title states, my car over heats only when the AC is on. Other wise the needle ALWAYS stays at one needle below perfectly even. Any Ideas? All I have done is added some anti freeze.

 

[_MSprotegy]

Are both fans turning on when you turn on the ac? That might be the problem. More stress on the engine without the proper cooling.

 

[SeR_Cyclops]

Well, the only time i turn on the AC is on the interstate going 70 plus mph cause I have to roll the windows up because of the wind. Otherwise I leave the windows down and AC off. So all I know is at 70mph it over heats with the AC on.
(If that makes sense)

 

[_MSprotegy]

Makes sense. When you are driving at those speeds, does your ac get cold or is it so-so? There might be something wrong on the ac side of things like their being a clog in your system.

 

[SeR_Cyclops]

Right, its cold but the comPressor cycles, it acts like it might be cutting off on low pressure but it keeps the cabin cold. I could take all the freeon out and clean the lines with nitrogen and re weigh in the system with freeon. Or I could put gauges on it to see if there is a line blockage....

 

[_MSprotegy]

Try to eliminate the possibilitys before you drive yourself crazy like my brother did when his car was heating up. He had a small hole in his radiator.

 

[fsd_619]

You could have a pinch/crack in the Ac Line..Mine does because when I took out my SMIC and installed Fmic I didnt keep the Smic installed because it didnt fit with my kit and it eventually cracked/got pinched and started leaking

 

[SeR_Cyclops]

Anyone else?