I went for a three hour drive today, and noticed the airflow was slowing down. It didn’t matter much because it was a comfortable day and didn’t really need much heat or vent. When I stopped, I opened the hood just to see if anything was amiss and I saw the freon line and the accumulator were covered with ice.

So I assume the AC compressor was on the whole time, not even cycling, and froze up the evaporator and no air could flow through it. I pulled the compressor relay, and the airflow was fine the whole way home.

So what is the most likely problem? What would make the compressor run when it isn’t turned on, and not even cycle as it normally does? Where should I start looking first?

Thanks.

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2006 Liberty CRD.

You pulled the most likely cause! ~ the relay! I have had one or 2 burn the contacts together. You can pop the top off & check if you wish.

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Australian KJ CRD 2006

Didn’t even think of that, but it sure makes sense. Thanks Layback40.

Update: Relay looks okay to me, but I’ll try replacing it anyway since that is pretty easy.

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2006 Liberty CRD.