The other day, my wife and I were on the interstate, driving to the Monday night football game, about ninety miles from home. After being on the highway for a while, the A/C started fluctuating a little. Cooler, then a little warm, then cold, then warm, and so on. It did not seem to have anything to do with engine speed or vehicle speed, or settings. To test, I had her switch it to full blast A/C (it had been on a nearly intermediate setting). It would go ice cold, to cool, and back to ice cold, and so on. Then we cranked it on to full heat, with the A/C disengaged. It continued the same behavior. Full hot, then not quite as hot, then full hot.
It did not do this on the way home, or since. If I had to guess, I would think that the control head could not make up its mind on where to position the blend door. When/if it does it again, is there a way I can check to see what it is doing without paying a ridiculous diagnostic fee?
It did not do this on the way home, or since. If I had to guess, I would think that the control head could not make up its mind on where to position the blend door. When/if it does it again, is there a way I can check to see what it is doing without paying a ridiculous diagnostic fee?
Nov 15, 2017 at 7:59 PM
