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2006 Santa Fe AC only blows hot air, compressor never comes on

PugglyPuggly TexasPosts: 2
edited May 2017 in Hyundai
AC blows hot air, freon ck and is good no leaks, plenty of pressure, found the diode was blown. This happened immediately after I had a new battery installed, replaced diode, still hot air, diode blown again. Went back to place I bought battery and the new battery was shorted out.......got new battery, new diode, still hot air......diode blown again. Could the shorted out battery have messed up something else that would keep the compressor from coming on?

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Answers

  • thecardoc3thecardoc3 Posts: 5,091
    Puggly said:

    AC blows hot air, freon ck and is good no leaks, plenty of pressure, found the diode was blown.

    The diodes can fail but they typically fail open, not shorted. The diode should block current flow when the clutch is engaged and be a path to dampen the inductive kick caused by the collapse of the magnetic field when the clutch is turned off. How are you testing it? How did you first prove that it was "shorted"?
    Puggly said:


    This happened immediately after I had a new battery installed, replaced diode, still hot air, diode blown again. Went back to place I bought battery and the new battery was shorted out.......got new battery, new diode, still hot air......diode blown again.

    The battery was not shorted out. Even if there was an issue with the battery, that would have nothing to do with the AC being inoperative, you would have been having issues starting the car. Now the question remains, if the problem truly started with the replacement of the battery, or was essentially discovered after it was replaced what happened prior to needing the battery?

    Was the original battery dead and the car needed to be jumped to get it started? Were the cables accidently connected backwards? Was the battery accidently connected backwards when it was installed?
    Puggly said:


    Could the shorted out battery have messed up something else that would keep the compressor from coming on?

    Suspecting a "shorted battery" and trying to diagnose from there is a mistake. Forget everything you know about the car and test and prove what it is doing right now. Connect a scan tool and recover codes from all of the modules in the car. List them.

    Does the PCM data show that the AC is being requested to be turned on?
    Does PCM data show that the clutch is being commanded on?

    Does data in the PCM or HVAC modules display AC system pressures? If so what are they?
  • PugglyPuggly TexasPosts: 2
    The original battery was replaced because the car was starting sluggishly , but still starting, no problems with AC. I took it to a shop, they put a new battery in, it was dark so I did not use the AC. The next morning when I went to start the car there was a pop and it did not start, so I tried it again and it started. during this trip to work I turned on the AC and after a bit I noticed it was not cooling. I didn't think the battery had anything to do with the AC, so I took it to a different shop to have it checked. This shop found the blown diode, everything else checked out freon, pressure etc. Replaced diode, still hot air, diode had blow again. This shop didn't know I had just put a new battery in it, but they asked question about what happened leading up to AC not working and I told them about the battery. They said take it back and have the battery checked, and back at the first shop they found that their new battery was shorted out......they put new battery in and checked it and all was good. I got new diode and it still did not blow cool air, diode blown again. They have used meters to check fuses and such, but not a scan tool to recover codes, a dealership would have that capability but my financial situation will not support that, so I am here asking questions.
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